the nautilus. 55 



Pelecypoda. 



Ostrea liirida Cpr. 



Placuuanomia macroschisraa Desh. 



Pecten hastatus Sby. (valves). 



Hinnites giganteus Gray (valves). 



Mytilus ediilis Linn. 



Mytilus edulis Linn., var. glomeratus Gld. 



Mytilus Californianus Conr. 



Adula styliua Cpr. 



Anodonta Oregonensis Lea (Nuttalliana Lea). 



Kellia Laperousii Desh. 



Cardium corbis Mart. 



Pisidium occidentale ISTewc. (abditium Hald.) 



Tapes staminea Conr. 



Tapes staminea, var. diversa Sby. 



Tapes staminea, var. ruderata Desh. 



Tapes tenerrima Cpr. 



Petricola carditoides Conr. 



Tellina Bodegensis Hds. (valves). 



Saxidomus aratus Gld, 



Macoma nasuta Conr. 



Matoma inquinata Conr. 



Macoma inconsj^icua B. & S. (valves). 



Angulus modestus Cpr. (valves). 



Angulus salmonea Cpr. (valves). 



SchizothiBrus Nuttallii Conr. 



Standella Californiea Conr. (valves). 



Lyonsia Californiea Conr. 



Lyonsia (Entodesma) saxicola Baird. . 



Cryptomya Californiea Conr. 



Mya arenaria Linn, (introduced). 



Saxicava arctica Linn. (? pholadis L.) 



Siliqua patula Dixon. 



Pholadidea penita Conr. 



Pholadidea penita var. parva Tryon. 



Zirphrea crispata Linn, (valves). 



Xylotrya setacea Tryon (pennatifera Blv.) 



