ON MOLLTTSCA OP THE WEST COAST OT YOUTH AMERICA. 



C41 



77, 

 78, 



79, 

 80, 



Fsephis Lordi, Baird, P. Z. S. 1863. Teeth noi-mal : pure -white. 20-40 fin. c. Cp. 

 Psephis salmonea, n. s. Very small, rounded, teeth elongate : salmon-coloured. 



30-40 fin. r. Cp. 

 Psephis tellimyalis, n. s. Shape of Tellimya : central tooth minute ; outside 



teeth long. 

 Verms Kennerleyi, Eve. Large, transverse, flattened, ashy : strong cone, ribs. 



Young Hke astartea, Midd. {riaX fluctuata, Gld.). 



81 . Chione sucdncta, Val. = Calif orniensis, Brod. = NuttaUi, Conr. Cone, ribs smooth. 



82. Chione excavata, Cpr. P. Z. S. 1856, p. 216. Scarcely differs fi'om cancellata. 



Possibly exotic. 



83. Chione simMlima, Shy. Finely sculptured each way. 



84. Chiotie^uctifraffa, Soj, -{-callosa, Shy. lAke Stntchbrnyi: swollen, irregular. 



85. Tapes tenerrima, Cpr. P. Z. S. 1856, p. 200, (jun.)= F. rigida, Gld. pars, £ 538. 



Very large, thin, flat ; long pointed sinus. 



86. Tapes laciniata, n. s. Large, swollen, brittle, ashen ; sculpture pectinated. 



87. Tapes staminea, Conr. Strong, shape of decussata ; sculpture close ; yellowish. 



Var. diversa, Shy. =mundulus, Rve. More swollen, clouded with chocolate. 

 Var. Petitii, Desh.=riffida, Gld. pars. Dead white, sculpture stronger faint, 

 open or close. 2 ft. deep in mud, between tides, Iiord. Var. tumida, Sby, 

 very swollen. Var. orbella, rounded, globose. Var. ruderata, Desh. Con- 

 centric sculpture laminated. 



Saxtdomus aratus, Gld. Otia. Very large, oval, with regular concentric ridges. 



Saxidomus Nuttallii, Conr. auct. Transverse, subquadrate, irregularly grooved. 



Saxidonms squalidus, Desh. Large, variable outline, broader, scarcely sculp- 

 tured. 



Saxidomus hreinsiphonatus, n. s. Smaller, CoKisia-shaped ; close, faint concen- 

 tric lines over distant waves ; mantle-bend very small. 

 Family Petricolida. 

 92. RupeUaria lamellifera, Cora:. = Cordieri, Desh. With large concentric laminae. 

 No radiations. 



Petricola carditoides, Com: -\- Calif omica, Com: -\-ci/lindracea, Desk. -\-arctiata, 

 Deak.+ffibba, Midd. Of various aspects, like Saxicava. Normally shaped 

 like Cypricardia, with fine sculptm'e like Naranio. 



Family Chamidce. 

 Chama exogyra, Conr. Reversed ; texture opaque ; rudely frilled. 

 Chama peliueida, Shy. Dextral, texture porcellanous, rosy ; closely frilled. S.A. 

 1863. 127 



89, 

 90, 



91, 



03. 



94. 

 95. 



