72 CALIFORNIA ACADEMY OF SCIENCES. 



MOLLUSCA 95 



CLASS V. PELECYPODA 95 



Order Prionodesmacea 95 



SUPERFAMILY NUCULACEA 95 



Family VI. NuculUlce 95 



Genus Nucula Lamarck 95 



Subgenus Acila H. & A. Adams 95 



11. (A.) caslrensis Hinds 95 



Subgenus Nucula, s. s 96 



12. (N.) suprastriata Carpenter 96 



Famibj Via. Ledidm 96 



Genus Leda ScHnMACHER 96 



13. fossa Baird 96 



14. hamata Carpenter 97 



15. minuta Fabr., var. prascursor, var. nov 97 



16. taphriaDALL 98 



Genus Yoldia MIjller 99 



17. cooperi Gabb 99 



IS. scissurata Dall 99 



SUPERFAMILY ARCACEA 100 



Family VII. Arcidce 100 



Subfamily Pectunculince '00 



Genus Glycymeris Da Costa 100 



19. barbarensis Conrad 100 



20. septentrionalis Middendorf 101 



Suhfamily Arciiice 101 



Genus Area (Linne) Lamarck 101 



21. labiata SowERBY 101 



SUPERFAMILY OSTRACEA 10^ 



Family VIII. Oslreidce 102 



Genus Ostrea (Linne) La m arck 102 



22. luiida Carpenter 102 



SUPERFAMILY PECTINACEA 103 



Family IX. Peclinidoi 103 



Genus Peeten Muller 103 



Subgenus Pecteu, s. s 103 



[S. B.] (P.) bellus Conrad 103 



23. (P.) dentatus Sowerbv 104 



[S. D.] (P.) hemphilli Dall 105 



24. (P.) stearnsii Dall 106 



Subgenus Chlamys Bolten 107 



Section Patinopecteii Dall 107 



25. (P.) cauiinus Godld 107 



[8. D.] (P.) expausus Dall 108 



Section Nodipecten Dall 108 



26. (N.) subuodosus Sowerby 108 



Section Chlamys, s. s 109 



27. (C.) hastatus Sowerby 109 



28. (C.) hericeus GooLD 110 



29. (C.) hericeus var. strategus Dall HO 



30. (C.) jordaui, sp. nov HI 



31. (C.) latiauritus Conrad HI 



32. (C.) latiauritus CoNR., var. fragilis, var. nov 112 



33. (C.) latiauritus Conr., var. monotimeris Conrad 112 



[S. D.] (C.) opuntia Dall 113 



Section Plagiocteuium Dall 113 



34. (P.) uewsomi, sp. nov 113 



[S. D.] (P.) subveutricosus Dall 114 



35. (P.) veutricosus Sowerby 114 



Subgenus Hiuuitea De France 115 



36. (H.) giganteus Gray 115 



