C O NTENTS O F THE NAUTILUS XLl . , Aca nthochites matthewsi Acmaea alveus Conrad Acmaea fer gu s oni Wheat Acmaea testu dinal i s Mii ll er Alvania almo and A . Winsl owa e Ampullaria orbata Perry Ancul osa carinata B rug A nc l od or i s D y baicalensis yb . s iber i cu s Ancylus Gerst . Anodonta or egonens i s Lea B i l i— D a ca a flori yb . B s h l l i a set u a Pils n . n . i i B ene ct a . D b d baicalensis Gerst and B . fragilis y Boston Malacological Club Brazilian Snails B l im l c al f i n i u u us (S ut u s ) el ppo e von Iher . n . sp B ulinus , teeth of m l m C a p e o a , sinistral er a t i c C od s u s , n otes on the genus Conus aurora Lamarck Correspondence Dall , William Healey ( obituary ) Dall , W . H . Memorial R esolution D i a pha na Guppy D i scostr obil ops Pils Donax fossor Say Donax variabilis S ay E ll i ptio ha r i cotti Frierson El liptio saj ens i s Frierson E uha dr a k ubs . sandai o a noi Pils Ckll . n . s p B D ulota asiatica yb . iv THE NAUTILUS K r oftohel i x fi scin B ulota ( a ) a Fulton , Saghalien s u b en E u s tr eptosyl a Baker n . g t ha te l la chr s ocha sm a m endoz n E u r oc a a . y Pils n . subs p . n i n F x l s bur u a u s . s . a u u u p Pils . n p Fitz i a Guppy l n l l Florida , a d she s of Genotypes , on the designation of P G eor i s sa stirata s e . at Rarotonga , Cooks Isl l h al inia bu r r in toni G yp y g Pil s , n . sp . Gly ptel a sm a I redale Hull Goniobasis a ur i com a Lea Goniobasis ebenum Lea Goniobasis germana Lea h e i Goniobasis yd Con . Goniobasis infor mi s Goniobasis l a w r enci Lea i r i l sb . Goniobasis p y Goodrich , n . n Goniobasis pl icifer a Lea Goniobasis silicula Gould n r An h Goniobasis sordida i cu ta t . Goniobasis stewa r d s oni ana Lea G ony odi s cu s m accl intocki Baker Haliotis cr a cher odi i imperforata Dall Helices in California ’ Helicinidae , Guppy s groups of H m 11 el i s o a campanulata michiganensis Baker . var Helix aspersa in New O rleans Helix nemoralis in Massachusetts , further notes on . Helix pisana in California Helix ver m icul ata in New O rleans H el minthogl y pta sequoia Pils . n . s p . H el minth ogl ypta tr a ski phlyctaena Bartsch H elmi nthogl y pta t r a ski proles Bartsch H i N . el minth ogl ypta tr a sk ewcomb , at Fort Tej on Calif i n i H elminth ogl yp ta umbil ca ta cay u cose s s Pils . H l ir l i o osp a cock er el , note on a double mouthed H m l i . u bo dtia na fe r r i s a na Pils . n . s p I llinois Pleistocene mollusks Io rota Reeve I schnochiton I solti a Guppy Lampsilis r a finesq u ea na Frierson L am p s fl i s str eck er i Fr i erson Lam ps1 l l s w r i ghti a nus Fr l er son THE NAUTILUS Lauria fa s ciol ata Mor el et Limax flavus in Alab ama Litha s ia ful iginosa Lea L itha si a nucl ea Lea Lithas i a ovata Say Litha s i a showa lter i Lea Litha s ia verrucosa Raf . 59 Lymnaea ( Galba ) hedl eyi Baker 2 3 sta nal i s Lymnaea g appressa Say , the fertilization of . 1 03 Lymnaea sta gna l i s occidentalis Baker 7 6 Lymnaea , teeth of 1 39 Ma r ga r ita na ma r ga r itifer a form falcata Gould 88 M a r r itif r M r i ga e a vs . a ga r ta na 9 1 of e Marine Mollusks Cape May County , N w Jersey , a quantitative study of the a Anth Melania abbreviat . Melania aequalis Hald Melania a l exa nd r ens i s Lea ita nia m Melania b e ta C o r . Melania brevis Lea Anth Melania compacta . Anth Melania densa . Melania d epygi s Say Melania g ibbosa Lea Anth Melania grisea . Melania hal ei a na Lea i n A h Melania l at ta s nt . Melania livida Reeve Melania ni ckl ini ana Lea a Anth Melani opaca . l anos i r a Anth Melania p p . r oci a Anth Melania p s s . Melania showalter i Lea Melania strigosa Lea An Melania tabulata th . Melania torta Lea . V n conul a B Microcystis i osa and M . se . at Rarotonga , ’ Cook s I sl . i hel M g s , Jesse Wedgwood Mollusca , some South Dakota . Mollusca of South Dakota , additional records Mollusca of Lake Baikal Mollusks of Volusia County , Florida , non marine . Mona d enia fld el i s Gray Mona d enia mor m onum l oweana vi T HE NAUTILUS ca l ifor ni anus Mytilus , the growth of the mussel 99 fi Nadean Lake , Fort Fa i r el d , Maine 84 N N 32 otes and ews , 7 0 , 1 06 ’ m hal otr o i s a P s e Ra t ton O . o a I p p vari bilis at g , Cook s s . 32 ’ o ar a r m Ffr ea s u . Op p at Rarotonga , Cook s Is 32 r eohelix l O strigosa depressa Ck l . 88 O l strea ca ifornica Marcou , note s on 45 O yster drill 1 40 O ysters , the noisy 7 1 P a ch mel a ni a y aurita Mull . 57 P i r bith n . a a y a Pils n n . 1 08 P a r a ner ita Annandale 1 08 P a ti no ecten Pecten ( p ) lohri Hertlein n . n . 93 P er m ochiton a u str a l i a nus 1 05 Petrarc a 1 08 Pila orbata Perry 64 P l anogy r a asteriscus Morse 1 2 2 Planorbis binney i Tryon 7 6 Planorbis cristata Linn . 85 Pl eur obem a a l d r i chi Frierson 1 39 P l eu r obem a fictu m Frierson 1 39 P l e u r obem a m a r s ha l l i Frierson 1 39 2 Pleurocera acuta Raf . 61 , 6 l e id P u r ocer s , some misplaced 57 . 32 Polita lucida Drap in Philadelphia , Pa . ol r P ygy a auriculata Say , a synonym of 7 0 P ol y gy r a m ul til ineata wanl e s s i Baker 1 32 i 4 P olygy r a towns end a na brunnea Va n. 7 Polynesian snails , records of 32 Pomacea Perry , on 63 Pomacea maculata Perry 64 Pr o e a a va ni cum 2 sop s j Reeve , at Apia , Samoa Is . 3 4 2 Publications received 3 , 7 1 , 1 0 Pupillidae 1 08 R umina decollata L . 1 39 3 1 Sars , Georg O ssian ( obituary ) S chr amm i a Guppy 2 2 1 08 S e nil a ur ia Pi ls . n . n . for Petrarca 1 1 8 Soap Lake , Washington s 2 4 S om a togy r u s tr y oni Pils . Baker n . p 55 m . s . S phaerium nota tu Sterki , n p S tr ophochei l us fel i pponei von Iher i ng 95 l of 2 1 Str eptos ty a Shuttleworth , the type Succinea retusa ful tonens i s Baker 1 36 32 S ubul ina octona at Apia , Samoa Is . THE NAUTILUS vii Symbiosis in a undescribed Bermudian nudibranch Thais flor idana Conr fi r i a a bs . Thais o dana h y s e Clench , s u p . n Thais lamellosa Gmel i i a T hy a s r a b s ecta Con . and di sj u ncta G bb T r y pa nostom a lyonii Lea T r y pa nostom a tenne sseense Lea Turritella sar gea nti Anderson and Hanna Turritella socor di a Hanna d ombe n l Unio y a a Va . Ur i chi a Guppy n z m e do ana . s Urocoptis Pil s , n p m n l m . o e a s u s . Urocoptis Pils , n s p v i na l en i s P fr Urocoptis g s . Valvata lewisii C urrier Valvata l ewisii precursor Baker Vermont shells Venus mercenaria var . notata Say Verrill A . E . ( portrait ) Vertigo goul dii l oes s ens i s Baker V olvulus Oken , type V . bidens ' V col ortex O ken , type V . ca r a us Montf . Weller , Professor Stuart INDEX T O AUT HO R S 2 2 4 Baker , Frank C .