74 CALIFORNIA ACADEMY OF SCIENCES. 



MOLLUSC A (Continued). 



Genus Venericardia Lamakck 128 



54. barbareusis Stearns 128 



55. veutricosa Gould 128 



Genus Lazaria Conrad 129 



56. Bubquadrata Carpenter 129 



SUPEBFAMILY CHAMACEA 130 



Family XX. Chamidce 130 



Genus Chama (Pliny) Linne 130 



57. exogyra Conrad 130 



58. pellucida Sowerby 130 



SUPERFAMILY LUCINACEA 131 



Family XXI. Lucinidie 131 



Genus Lucina Brcgdiere 131 



59. acutilineata Conrad 131 



60. califoruica Conrad 132 



61. nuUalli Conrad 132 



62. tenuisculpta Carpenter 133 



Family XXI I. Diplodonlidce 133 



Genus Diplodouta 133 



Section Diplodouta, s. s 133 



63. (D.) orbella GooLD 134 



64. (D.) serricata Eeeve 134 



Family XXIII. Cryptodontidas 135 



Genus Thyasira Leach 135 



65. bisecta Conrad 135 



66. gouldi Philippi 135 



SUPERFAMILY LEPTONACEA 136 



Family XXI V. Leptovidu; 136 



• Genus Bornia Philippi 136 



67. retifera Dall 136 



Genus Kellia Tprton 136 



Section Kellia Turton, s. s 136 



68. (K.) laperousii Desha yes 137 



69. (K.) suborbicularis Montagu 137 



Family XX I'. KellidUdm 138 



Genus Aligena H. C. Lea 138 



70. cerritensis, sp. nov 138 



SUPERFAMILY CARDIACEA 138 



Family XX VI. Cardiidce 1 38 



Genus Cardium (Linne) Lamarck 138 



Subgenus Trachy cardium Morch 138 



71. (T.) quadrigenarium CoNEAD 139 



Subgenus Eiugicardium Fischer 139 



72. (E.) procerum Sowerby 139 



Subgenus Cerastoderma Morch 140 



73. (C.) coibis Martyn 140 



Subgenus LsBvicardium Swainson 140 



74. (L.) elatum Sowerby 141 



75. (L.) substriatum Conrad 141 



Genus Protocardia Beyrich 142 



76. centifilosa Carpenter 142 



SUPERFAMILY VENERACEA 142 



Family XX VII. Veneridce 142 



Subfamily Venerince 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 



