ON MOLLUSCA OF THE WEST CO.AST OF NOTiTH AMERICA. 



641 



77. Psephia Lordi, Baird, P. Z. S. 1863. Teeth normal : pure white. 20-40 fm. c. Cp. 



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



30-40 fm. r. Cp. 



79. Psephis tettimyalis, n. s. Shape of Tellimya : central tooth minute j outside 



teeth long. 



80. Venus Kennerleyi, Rve. Large, transverse, flattened, ashy: strong cone. ribs. 



Young like astartea, Midd. (notfrtctuata, Gld.). 



81. Chione succincta, Val. = Calif orniensis, Brod. = Nuttatti, Conr. Cone, ribs smooth. 



82. Chione excavata, Cpr. P. Z. S. 1856, p. 216. Scarcely differs from cancellata. 



Possibly exotic. 



83. Chione simillima, Sby. Finely sculptured each way. 



84. Chione fluctifraga, Sby.+callosa, Sby. Like Stutchbnryi : swollen, irregular. 



85. Tapes tenerrima, Cpr. P. Z. S. 1856, p. 200, (jun.)= V. rigida, Gld. pars, f. 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, Sby.=mundulus, Rve. More swollen, clouded with chocolate. 

 Var. Petitii, T)esh.=rigida, Gld. pars. Dead white, sculpture stronger faint, 

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

 "Very swollen. Var. orbella, rounded, globose. Var. ruderata, Desh. Con- 

 centric sculpture laminated. 



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



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



90. Saxidomus squalidus, Desh. Large, variable outline, broader, scarcely sculp- 



tured. 



91. Saxidomus brcvisiphonatus, n. s. Smaller, Callista-shaped ; close, faint concen- 



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

 Family Petricolidce. 



92. Rupellaria lamellifera, ConT. = Cordieri, Desh. With large concentric laminas. 



No radiations. 



93. Petricola carditoides, Conr. + Californica, Com\+cylindracea, Desh.+arcuata, 



Desh. -\-gibba, Midd. Of various aspects, like Saxicava. Normally shaped 

 like Cypricardia, with fine sculpture like Naranio. 



Family Chamidce. 



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



95. Cliama pettucida, Sby. Dextral, texture porcellanous, rosy j closelv frilled. S.A. 

 1863. 107 



