Clark: The San Lorenzo Series of Middle California 49 



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Donax sp. indt 155 



Family Solenidae 155 



Genus Solen - 155 



Solen (Pleetosolen) eurtus Conrad 155 



Solen gravidus, n. sp 156 



Family Mactridae _ 157 



Genus Spisula 157 



Spisula oecidentalis Gabb 157 



Spisula ramonensis Packard 158 



Spisula ramonensis attenuata, n. var 158 



Spisula "? saxadomoides, n. sp 159 



Genus Mulinia : 159 



Mulinia ? sp 159 



Family Myacidae 160 



Genus Mya 160 



Mya (Cryptomya) incognita, n. sp 160 



Family Saxicavidae 161 



Genus Panope 161 



Panope cf. estrellana Conrad 161 



Family Pholadidae 162 



Genus Pholadidea 162 



Pholadidea aff. penita Conrad 162 



Family Teredinidae 162 



Genus Teredo 162 



Teredo sp. indt 162 



Class Gastropoda 163 



Family Trocliidae 163 



Genus Calliostoma , 163 



Calliostoma lawsoni, n. sp 163 



Family Pyramidellidae 163 



Genus Turbonilla 163 



Turbonilla, sp 163 



Family Epitonidae .'. 164 



Genus Epitonium 164 



Epitonium pinolensis, n. sp 164 



Epitonium ventricosum, n. sp 164 



Epitonium, sp. indt „ 164 



Family Solariidae 165 



Genus Solarium 165 



Solarium lorenzoensis (Arnold) 165 



Family Capulidae 165 



Genus Calyptraea 165 



Calyptraea (Galerus) cf. excentrica (Gabb) 165 



