ARNOLD — THE PALEONTOLOGY AND STRATIGRAPHY OP SAN PEDRO. 77 



MOLLUSCA (Continued). 



Genus Pauomya Gray 183 



136. ampla Dai.l 183 



SUPERFAMILY ADESMACEA 183 



Family XXXIX. Pholadldte 183 



Subfamily Pholatlinae 183 



Genus Zirphaja Leach 183 



137. gabbii Tryon 184 



Subfamily Jouanni'tinii- 18* 



Geuus Pboladidea Goodall 184 



Subgenus Pboladidea, s. » 184 



Section Peuitella Valenciennes 184 



13S. (P.) penita Conrad 184 



CLASS VL SCAPHOPODA 185 



Order Solenoconchia 185 



Family XL. Dcnlaliida: 185 



Genus Deutalium Linne 185 



139. hexagonum Sowerby 185 



140. iudiauorum Carpenter 186 



141. pseudobexagouum Dall 186 



142. semipolitum Broderip & Sowekby 187 



Genus Cadulns Philippi 187 



143. nitentior Carpenter 187 



CLASS VII. GASTROPODA 188 



Order Opisthoeranciiiata 188 



Family XLI . Actaoiiidce 188 



Geuus Actteou Montfort ._ 188 



144. traskii Stearns 188 



Subgenus Riclaxis Dall 188 



145. (R.) punctocoelata Carpenter 189 



Family XLI/. Tornatinidie 189 



Genus Tornatina A. Adams 189 



146. cerealis Gould 189 



147. culcitella Gould 190 



148. eximia Baird 190 



149. barpa Dall 191 



Genus Volvula A. Adams 191 



150. eylindrica Carpenter 191 



Family XLI II . Scaphandridce 192 



Genus Cylicbna Loven 192 



151. alba Brown 192 



Family XLI V. Bullidm 193 



Genus Bulla Linne 193 



152. punctulata A. Adams 193 



153. quoyl Gray 193 



Genus Haminea Leach 194 



154. virescens Sowerby 1 94 



Order Pulmonata 194 



Suborder Stylo mmatophora 194 



SUPERFAMILY MONOTREMATA 194 



Family XL V. Helicidm 194 



Genus Helix Linne 194 



Subgenus Epiphragmophora Strobel 194 



155. (E.) sp. indet 195 



SUPERFAMILY HYGROPHILA 195 



Family XL VI. Limnoiidce 195 



Subfamily Planorbince 195 



Geuus Planoibis Guettard 195 



156. tumidus Pfeiffer 195 



157. vermiculaiis Gould 195 



