L A S. 



Species 30. (Fig. a, b, xMus. Cuniiiig in Brit. ) 

 PllOLAS Incki. Pho. tesid siibri/Undrird, brevi, ventri- 

 cosd, pwtibus tribus dirifid; parte untied pi-ope 

 marginem ventralein sublwvigald, dorso usque ad 

 medium mimite longitudinaliter et radiatim Mriatd ; 

 parte medid pland, epidermide crai:sd indutd ; parte 

 ponticd oblique inangtdari, epidermide taminis 

 serratis producld ; marginis dnrsalis integumento 

 quadripartito, partibus anticis lalis, brevihus, podicis 

 laiioribus elongatis. 

 Ince's Pholas. Shell subcylimlrical, short, vcntricose, 

 divided into three parts ; the anterior part smooth 

 near the ventral margin, from back to middle 

 minutely longitudinally and radiately striated ; 

 middle part flat, covered with a thick epidermis ; 

 posterior part obliquely triangular, with the epi- 

 dermis produced in serrated lamina; ; integument 

 of the dorsal margin quadripartite, the anterior 

 parts wide, short ; the posterior parts wider, 

 elongate. 

 SowEKBY. Proc. Zooi. Soc, LSI',). 

 Ilab. Raine's Island, Torres Straits. 



This extremely curious species was first procured by 

 Captain Ince, R.N., in coral rock. 



anterior ; hiterai :irea in front of tlie umboes at the 



dorsal margin Hat. 

 SuWEunv. Vvor. Z,.ol. Soc, IS-l'.t. Thesaurus Conchy- 



lioruin, No. 10, phvte oiii. f. 17, LS. 

 Hah. JIanilla Bay. 



Collected by the late Mr. ('inning. 



Species ;31. (Fig. a, h, Mus. Cuming in Brit.) 

 I'holas M.\.siLLiE. Pho. testa apertd, elongatd, antice 

 subangulatd, costis subdist<intibus acutissime imbri- 

 catis omnino radiatd ; vmbonibus subanticis ; ared 

 laterali ante umbones ad marginem dorsalem pland ; 

 ■icuto dorsali parvo, arcuato. 

 The Manilla PiiOLAS. Shell open, elongated ; anteriorly 

 slightly angular, rayed all over with rather distant 

 very acutely imbricated ribs; umboes rather 



Species '■>■!. (Fig. a, h, c. Mtis. 15rit. ) 



PiioLAS STi'.iATA. Pho. Icstd clausd, medio oblique 

 divisd, antice angulaiim longitudinaliter, costatd ; 

 costis ser7'atis : margine anlico-ventrali laevigata, 

 rotundato ; parte posticd versus medium concentrice 

 striatd ; extremitate plus minusre productd, et atle- 

 nuald ; scuto ventrali uno eUmgato ; sctitis dorsa- 

 libus duobus, uno lata subquadrato, super umbones 

 disposito, uno po.'itico, etongato, angusto. 



The stiuated Phola.s. Shell closed, obliquely divideil 

 in the middle, anteriorly angularly longitudinally 

 ribbed ; ribs serrated ; anterior ventral margin 

 smooth, rounded ; posterior part concentrically 

 striated towards the margin, extremity more or 

 less produced and attenuated ; one elongated ventral 

 shield, two dorsal shields, one wide, subquadrate, 

 placed upon the umboes ; one posterior, elongated, 

 narrow. 



LixN.EUS. SystcMia Natur;e. 



Pholas nana. Pulteney. 



Pholas pusilla. Linnjeus. 



Pholas lignorum. Spengler. 



Pholas conoides. Fleming. 



Pholas clavata. Lamarck. 



Hob. Coasts of Great Britain, and almost everywhere, 

 floating. 



August, 187i 



