497 



towards the posterior end, and is spread over a large part of tlie 

 anterior, towards the ventral edge, so as, when fully developed, to 

 cover the entire front. 



Collected by J. E. Dring, Esq., R.N., in coral rock, low water, 

 at Tartlet's Island, north coast of Austraha. 



35. PiioLAS SPATHULATA (pi. cvi. f. 69, 70), Sowcrit/, juiir., 

 Pro. Zool. Soc, 1849. 



Ph. testa elongata, clausa, oblique divisa ; parte antica radiatim 

 costata, subangulata; parte postica concentrice leviter striata, 

 subtnmcata, ad margines integumento protecta, ad terminum in 

 cyatho corneo, lateribus spathuliformibus, producta ; ad unibones 

 laminis duabus sequahbus, postice bilobatis, antice elongatis. 



The front part is ribbed and imbricated ; the posterior is rather 

 smooth, elongated, and squared at the end, with the edges covered 

 by a folded integument. The cup is rather flat, and separated 

 at the sides. The umbonal sliield consists of two trilobate laminae, 

 the anterior lamina elongated to reach the anterior termination. 



Prom New Zealand. Mr. Earle. 



36. Pholas concameeata (pi. cvi. f. 67, 68), Besliayes. 



Ph. testa ventricosa, clausa, oblique divisa ; parte antica inflata, 

 radiatim costata, costis imbricatis, margiuibus dorsalibus late re- 

 flexis ; parte postica striata, ad terminum subquadrata ; in cyatho 

 corneo, ad latera diviso, producta ; ad umbones lamina subquad- 

 rata, magna, postice subacuminata ; tiim laminis duabus latis cum 

 marginis testa? terminalibus coufluentibus. 



The front part of the valves is ribbed, and very strongly imbri- 

 cated, and the dorsal edges are very widely turned back over the 

 umbones. The cup is separated at the edges. There are three thick, 

 shelly dorsal plates : one broad and rather square, the two others 

 opposed to each other, very broad and tumid, and anteriorly con- 

 fluent with the expanded margin, which fills up the ventral gape. 



Pound in sandstone, deep water, at Monte Eey, California, by 

 M. Hartweg. 



37. Pholas papyracea (pi. cvi. f. 66), Turton, Dithyr. Brit, 

 p. 2. pi. i. f. 1 to 4. Ph. lamellata, Turt., Dithyr. Brit. p. 4. pi. i. 

 f. 5, 6. Pholadidsea Loscombiana, Turt., Conch. Diet. p. 147. 

 Ph. Goodallii, Diet. Sc. Nat. vol. xxxvii. p. 532. Ph. striata, 

 Griffiths et Cuvier. 



Ph. testa subcylindrica, clausa, canali serrato divisa; parte 



