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ACADEMY OF SCIENCES ; SOMETlilE SUPERlNTENDENt r" J ^ * r y ' -1 •^r / ' F '.^ - - ,\ J" - ' ".V. THE JNDlAN teSE^M •- •y X- N - I "^ ->-' i^-. J ^ s \ 'U'. - J.'' --7V - -I - .-^ t > •' ^ - -t •(' -rf •M- JL- r- A "^te^\^A-:-y-^.i •V-'; •* .-r '• '.^T:' ^.*^ •<^'''/.--•••', ' ^ ^ k - ^ -• S •• - —> ^ ^. y •-i> ^ -•- ^-- ^ '--'••\ .:> ' . -I- .^. ^ -^ \ — • ^ ^ - .1 rT ^r A i ^ '•. :*-^^-.i V ^-r '• -T •-i f-^r L ^ ; V r h ^' * ... ,'. ^^ ^ -I ' ^,.- -•!• • II ^' _H ^ ' ^ .< w*-^' \' I I. ^v'-. ^-J '•J ^ •: ' ,-: ^ •. r*d * •'. .J - ::Mi; ?^"j ,• _^ 1.^ jWt. %- '? M- J^-' / /• i-. -1 •! ^ •• I r' F- - . • • • _ 1^ /* • _ .•- I , 'i: /• . •^ •%' T i- 1 -' -f ^ .-{-L - |. V •f- s -- •'' r- '^ ..i- •I.-* I, - . ^:' . Ti^ • • y- '.* r*. »^. ,1- •-.' 1 - •' \- - \ j t '•"- L' ' I- _- -H V :-v^! -.*', / - X ' '\ -^ •• I ' •- -' • , '•"''%^i J ' \ *- '\ j ' '.. .-^ \ -I •-. -^ <• • ' . --- - ' 'Sr^ •*. 11 H - I- v' .•^l -X ?• ' 1 •'->: ^. ^a. -< — * I.- - • ' y '- <-^.. ^ •/' ^ .f^ ' '- ^ r ^ • r' -• \ >' C V — ' #-^ 'ta \^ -- ,. -_x J A. 1» . / \- ^' / r / •- '» • > ' ' K- - '1 d " ^•. L -- > -i - <- •> • I i^--^"^ I X ^' .' -^ b I I I \ f. ' '^, I- • r- ^ "r OtoER OF THE TRUSTEES OE THE MIXSBUM' - / - > ' 'M>^} V -' .' / A - f \ / \ J r- r-' -\ 'x .-' .* •^ -' • '- * 1910 j_ 1 -= ;v •M - -I FI r J x' - * \ !- ^ I - •v. •l- "• ^: \ •f. --- ' . \ \ 1- / L •- .^ PriGe Fourteen ^ (•v 1 1 X ^ ' .'^ - •^.- \l 1'' ^ I --. -, I. -— . -^ ' ' s ^ -•-.. I- >J • I -H ' 1^ >_V^ t.- •»- ^. »» -\ ,s , • r--. .-'; ^ ^ •i ' *- > I y #1 - - .. , •/( •- ^ y • . .-^ •-, /- .X J ^ .\ -.-T" '' '-•••••M - \- - •- . " - ' >i - - ' ' •.r>^"-: Iz' - — -X- 1 • ^. ct .^'T^-^. •'. ' 1 = , y .[• V. • F- «.^ ^ -.• ' > ' " \ ^_. - \ ^ .J.' .—J •• - 1 ' . ,r J. '*;* X • ^ I V 'h •^^^ .^ -^ _- , > ^?: ; - ^ <J -K' .-• i: 1 ./ -• ^-. 1 _. !•, -• J 1 -1 J '-. 1 P.' * "[ ' f ' f-. -I J • I . F1 - . '' \ ^s^' *: ^-^\ «• \ 1 -'• • - "V—'^ - \ •• W M^ X :' > '- -F * » V. ' X / - ' *•- I • ^, '• ^ • •^^''• ^ •*.« .' •.,#^^-\ ,c- V J - h . f - -^ -. 1 n ' •^ -: V V ^ '. • L'- '••;.,- •--Z^y^- ^^j; V CATALOGUE OF THE INDIAN ECAPOD CRUSTAC IN THE COLLECTION OF THE ODIAiN MUSEUM PART I. BRACHYURA. FASCICULUS II. THE INDIAN FKESH-WATEE CRABS-POTAMONID^. BY A. ALCOCK, C.I.E., M.B., LLD, F.R.S. LIEUTENANT-COLONEL INDIAN MEDICAL SERVICE (RETIRED), CORRESPONDING MEMBER OF THE ZOOLOGICAL SOCIETY ; HONORARY MEMBER OF THE NETHERLAND ZOOLOGICAL SOCIETY AND OF THE CALIFORNIAN ACADEMY OF SCIENCES ; SOMETIME SUPERINTENDENT OF THE INDIAN MUSEUM CALCUTTA: PRINTED BY ORDER OF THE TRUSTEES OF THE INDIAN MUSEUM 1910 t PREFACE THE first fascicle of the first part of this Catalogue of Indian Decapod Crustacea was published in 1901, and contained the Introduction and the Brachyura Primigenia or Dromiacea; this second fascicle of the first part includes the Cyclometopon Family of Potamonidce, or Fresh-water Crabs, and is intended, like its precursors of the series, to be complete in itself. This instalment, however, difi^ers from its precursors in containing neither a Bibliography nor a full Table of Genera and Species, the chief reason for their omission being that Miss E-athbun's recent Memoir, "Les Crabes d'eau douce," published in Nouvelles Archives du Museum d'H Naturelle, Series 4, 1904-1906, renders them unnecessary. I r I. INTRODUCTION THE Potamonidw, to give them their new patronymic, derived from an old eneric name that was exhumed about twelve years ago-—the Thelplieusiens and Thelphusinoe of Milne Edwards, the Telphusinea of Dana, the Telphusidw of other days—are one of the families of Cyclometopon or Cancroid Crabs. On pp. 27 and 28 of the first fascicle of the first part of this catalogue there will be found a scheme of classification of the crabs which shows the position of the Cyclometopa, as accepted and understood in this work; and I would further refer to a paper in the Journal of the Asiatic Society of Bengal for 1899, vol. Ixviii., part ii., pp. 470-473, for the scheme of classification of the Cyclometopa, to which I propose still to adhere. Both these schemes have recently been modified to a slight extent, and incidentally the good old terms Cyclometopa and Catometopa (to which at one time the Potamonidce were referred) have disappeared; but modifications of this kind seem to me to be, like the manner of spelling Sam Weller's name, entirely a question of taste and fancy. Of the five families—Corystidce, Cancridw, Portunidw, Xanthidce, and PotamonidcE—that constitute the tribe Cyclometopa, the nearest connexions of the Potamonidm seem, from every point of view, to be the Xanthidce. The Potamonidce have been variously arranged in subfamilies by different authors, but I am not prepared to accept any of the subdivisions hitherto proposed. This subject will be considered further on : for the present, it is enough to say that the Potamonidce of the Oriental region can be grouped in two subfamilies, namely—(1) Potamoninoe, and (2) Gecarcinucince or Para- telphusinw. The definitions of these subfamilies, and of the genera and subgenera assembled under each, will be found in the sequel. It is necessary, first, to say something of the habits of the Potamonidce; of their geographical distribution, with special reference to the Oriental region; and of certain things that make both the identification and the grouping of the species of this family particularly difficult. As it will be necessary, in dealing with these matters, to refer to certain species by name, the initial proceeding must be to present a list of the Indian species included in the family. This hst can not be A 2 egarded as complete, seeing that there are larg of the try, such Rajputana and the States of Central India, Hyderabad and Berar, the Central Provinces and the small States between them and Chota Nagpur, and, last of all, Mysore, where fresh-water crabs have been hardly touched by collectors. It is of course possible, that in such dry parts of the country as those first mentioned, fresh-water crabs may
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