74 CALIFOENIA ACADEMY OF SCIENCES. 



MOLLUSC A (Continued). 



Genus Venericardia Lamarck 128 



54. barbarensis Stearns 128 



55. ventricosa Gocld 128 



Genus Lazaria Conrad 129 



56. aubquadrata Carpenter 129 



SUPERFAMILY CHAMACEA 130 



Family XX. C'hamidce 130 



Genus Chama (Pliny) Linne 130 



57. exogyra Conkad 130 



58. pellucida Sowerey 130 



SUPERFAMILY LUCINACEA 131 



Family XXI. Lucinida 131 



Genus Lucina Bruguiere 131 



59. acutilineata Conrad 131 



60. califoruiea Conrad 132 



61. mUtalli Conkad 132 



62. teuuisculpta Carpenter 133 



Family XXII. Dipladontidce 133 



Genus Diplodonta 133 



Section Diplodonta, s. s 133 



63. (D.) orbella Gould 134 



64. (D.) serricata Reeve 134 



Family XXIII. Cryptodonlidae 135 



Genus Thyasira Leach 135 



65. bisecta Conrad 135 



66. gouldi Philippi 13*5 



SUPERFAMILY LEPTONACEA 136 



Family XXI V. Leplonidce 136 



Genus Bornia Philippi 136 



67. retifera Dall 136 



Genus Kellia Tcrton 136 



Section Kellia Tcrton, s. s 136 



68. (K.) laperousii Deshayes 137 



69. (K.) suborbicularis Montagu 137 



Family XX V. Kellicllida- 138 



Genus Aligeua H. C. Lea 138 



70. eerritensis, sp. nov 138 



SUPERFAMIL Y CARDIACEA 138 



Family XX VI. Cardiidce 138 



Genus Caidium (Linne) Lamarck 138 



Subgenus Trachycardium Morch 138 



71. (T.) qnadiigenarium Conrad 139 



Subgenus Eingicardiiim Fischer 139 



72. (K.) procerum Sowerey 139 



Subgenus Cerastoderma Morch 140 



73. (C.) corbis Martyn 140 



Subgenus LiBvicardium Swainson 140 



74. (L.) elatum Sowerey 141 



75. (L.) substriatum Conrad 141 



Genus Protocardia Beykich 142 



76. ceutitilosa Carpenter 142 



SUPERFAMILY VEXERACEA 142 



Family XX VII. Vcneridai 142 



Subfamily Venerirue 142 



Genus Tivela Link 142 



77. crassatelloides Conrad 143 



Genus Callista PoLi 143 



78. newcombiana Gabb 143 



79. subdiaphana Carpenter 144 



80. subdiaphana Carpenter, var. pedroana, var. nov 144 



