638 



90. Cytiier/Ea convexa (pi. cxxxii. f. 119), Say. C. Sayana, 

 Conrad, Silliman's Journal, vol. xxiii. p. 345. 



Cyth. testa ovali, ventricosa, fulva, subrugosa ; latere antico 

 brevi ; lunula vix distincta. 



Shell oval, brownish, ventricose, roughened by concentric 

 irregular and rather coarse striae. 



Rhode Island; New Jersey. Specimens, Mr. Cuming's and 

 Mr. Hanky's. 



91. Oyther/tsa pallescens (pi. cxxxii. f. 135), Sowerly, sen., 

 Pro. Zool. Soc. 1835. p. 47. 



" Cyth. testa, obovata, tenui, pallide lutescente, lsevi, conccn- 

 trice striata ; latere antico breviore, apicibus subprominulis ; hn- 

 pressione cordiformi, antica clongata, distincta." 



Shell of an oval fiattish form, rather light, pale yellowish, or 

 with a purplish tinge near the umbones ; concentric strife so fine 

 as to give a silky appearance to the surface. 



Island of Annaa, Pomoutian Group ; in coral sand. Cuming. 



92. Cyther/ea inconspicua (pi. cxxxii. f. 133, 134), Soiver- 

 hy, sen., Pro. Zool. Soc. 1835. p. 47. 



" Cyth. testa, obovata, crassiuscula, lrevi, albida, concentrice 

 striata, striis exilissimis ; epidermide tenuissima, pallide subfusca ; 

 apicibus subprominulis ; imprcssione cordiformi, antica ovata, 

 inconspicua." 



Shell more thick, and with the strise more distinct than the 

 preceding. 



Payta, Peru. Cuming. 



92*. Cyther^a Kingii (pi. exxxiii. f. 129, 130, 131, 132), 

 Gray, Wood's Suppl. Venus, f. 9. C. modesta, Rhilippi, Abbild. 

 t. iii. f. 3. Var. C. Lamarckii, Gray, Analyst, 1838; Ilanlcy, 

 Recent Shells, p. 103. Var. C. albida, Gray? Var. C. bilunu- 

 lata, Brit. Mus. 



Cyth. testa ovali-oblonga, subcomprcssa, medio lasvigata, ad 

 latera substriata, albida, castaneo fasciatim varie radiata; latere 

 antico brevi, declivi, lunula elongata, subcomplanata, distincta ; 

 latere postico elongato, subcpiadrato, margine dorsali subelevato. 



Shell oval, oblong, not very ventricose, smooth in the middle, 

 slightly striated at the sides; whitish, generally with chestnut 

 rays either linear or broad; anterior side short, sloped, with 

 the lunule long and defined ; hinder side elongated, rather square, 



