214 



The following shells from the Exploring Expedition were 

 described by Dr. Gould. 



Pholas pattjla. T. oblonga, papyracea, alba, inequilateralis, 

 concentrice undato-striata, constrictione mediano partita ; latere 

 antico trlangulari, radiatim costato, costis ad undas tuberculiferis ; 

 latere postico subquadrato, inermi : margine cardinali revoluto, 

 umbonem tegente sed non adnato, callum dentiformem gerente : 

 cochlea subulata, arcuata : cavitate ad undas, costas et tubercu- 

 los indentato. Long. 3; lat. 1|; alt. If poll. Hab. Philippine 

 Islands. 



The shell most nearly approaching to this is P. latissima, 

 Sowb., and possibly may be the same species. It also resembles 

 P. truncata. It is remarkable for the breadth of the valves. 



SoLEN scALPRUDi. Tcsta transversa, oblonga, retrorsum dila- 

 tata, valde inequilateralis, tenuis, lucida, epidermide flavo-viridi, 

 nitido, iridescente induta ; latere antico sub-acuto, oblique rotun- 

 dato ; latere postico semicirculari : cardo dentibus duobus con- 

 tiguis, divergentibus in v. dextra ; dente subulate, arcuato in v. 

 sinistra ; margine cardinali costa alba submarginali suffulto : 

 interior albida. Long. 1 J ; lat. |- ; alt. y% poll. Hah. Singa- 

 pore. 



Allied to Solecurtus costatus and radiatus. The hinge margin 

 is fortified by a thickening, and indeed there is the vestige of a 

 rib passing from the beak to the ventral margin. 



SoLEN sicARius. T. transversa, oblonga, retrorsum angustata, 

 sub-falcata, epidermide crasso, nitido, corneo induta, antice ob- 

 lique truncata, postice rotundata : valvis valde excavatis, undu- 

 latis, areis triangularibus indistincte partitis ; margine dorsali 

 recto; m. ventrali arcuato ; natibus terminalibus : cardo dente 

 triangulari, erecto, recurve in utraque valva instructa. Long. 3^ ; 

 lat. /^ ; alt. y^^ poll. Hah. Straits of De Fuca, Oregon. 



The only species to which this bears any resemblance is S. 

 viridis, which has nearly the same hinge and general form, but 

 which is a more delicate and more slender shell. 



Panop-EA ANTARCTICA. T. subquadrata crassa, alba, rudis, 

 concentrice undata, postice truncata, antice angustata et rotun- 

 data ; margine cardinali erecto, margine ventrali arcuato ; um- 



