Zoological Society. ' 431 



This species have sculpture similar to Sp. princeps, but the valves 

 are more gibbous, especially at the anterior part ; the shell is much 

 thinner, and the general outline different. 



Mya semistriata. Hartley, Zool. Proc. 1843. 



Sph^nia princeps, Adams. S. testa magna, albd, transversd, 

 ovali, incequilaterali, concentrice striatd ; latere antico, longiore, 

 rotundato, Icevi; postico breviore, angustato, subtruncato, radiu' 

 tim sulcata; margine ventrali arcuato, integro ; impressione 

 palliali vix sinuatii ; dente cardinis emarginato. 



Hab. Philippine Islands ; H. C. (Mus. Cuming.) 



Sph^nia elliptica, Adams. S. testa transversa, ovali, sub- 

 cequilaterali, albd, fragili, utrinque rotundatu, epidermide tenui 

 partim obtectd, concentrice striatd ; latere antico lavi, postico 

 radiatim striato ; impressione pallii vix sinuatd ; dente cardi- 

 nis scepe valde antich fisso. 



Hab. Sydney, 4 fathoms, mud ; Mr. F. Strange. (Mus. Cuming.) 

 Mus. Hanley. 



SpHiENiA DECURTATA, Adams. -S. tcstd transversd, ovali, sub- 

 cequilaterali, albd, concentrice transversim sulcatd; longitudina- 

 liter tenuissime radiatim striatd; antice latiore, rotundatd, 

 postice angustatd, angulatd, abrupte truncatd; margine ventrali 

 arcuato, integro ; impressione pallii sinu parvo ; dente cardinis 

 antich valde fisso. 



Hab. Catanuan, province of Tayabas, island of Luzon, in sand at 

 low water ; H. C. (Mus. Cuming.) 



Sph^nia philippinarum, Adams. S. testa ovali, transversd, 

 subincequivalvd, albd, tenui, ventricosd, incequilaterali; latere 

 antico longiore, rotundato, Icevi; postico breviore, radiatim 

 striato, vix truncato ; epidermide fusco tenui tectd ; tnargine 

 ventrali interdum subsinuato ; impressione palliali sinu parvo ; 

 dente cardinis valvules sinistrce trilobato. 



Hab. Sibunga, island of Zebu, fine sand, 30 fathoms ; H. C. Bay 

 of Manila, clayey sand, 6 fathoms ; H. C. (Mus. Cuming.) 



Sph^nia RupPELLii, Adams. S. testd transverso-elongatd, trans- 

 verse striatd, epidermide fusco tectd; latere antico breviore, 

 rotundato, gibboso, obsolete radiatim striato ; postico longiore, 

 angustiore, subrostrato, truncato; dente cardinis valvules 

 sinistrce subsinuato. 

 Hab. Red Sea ; Dr. Rilppell. 

 Sph^nia mindorensis, Adams and Reeve. 

 Foy. Zool. Samarang, t. . f . 



May 14.— William Yarrell, Esq., V.P., in the Chair. 



Descriptions of two species of Crustacea in the 

 British Museum. By Adam White, Assistant Zool. 

 Dep. Brit. Mus. 



potamobius serratus. 



Cancer serratus, Shaw, Zoology of New Holland, t. 8. 



Beak shorter than the peduncle of the outer antennse, with three 



