ARNOLD — THE PALEONTOLOGY AND STUATIGEAPHY OF SAN PEDUO. 77 



MOLLUSCA (Continued). 



Geuus Pnuomya Gray 183 



136. ampla Dai.l 183 



SUPERFAiULY ADESUACEA 183 



Faviily XXXIX. Pholadidiv: 183 



Sitbfamilij Pholadince 183 



Genus Zirpham Leach 183 



137. gabbii Tryon 184 



Subfamily Jouannetina 184 



Geuus Pholadidea Goodall 184 



Subgenus Pholadidea, s. s 184 



Section Penitella Valenciennes 184 



138. (P.) peuita Conrad 184 



CLASS VI. SCAPHOPODA 185 



Order Solenoconchia 185 



Family XL. Dcntaliidce 185 



Geuus Deutalium Linne 185 



139. hexagonum Sowerby 185 



140. iudianorum Carpenter 186 



141. pseudohexagouum Dall 186 



142. semipolitum Broderip & Sowerby 187 



Genus Cadulus Philippi 187 



143. niteutior Carpenter 187 



CLASS VII. GASTROPODA 188 



Order Opisthobkanchiata 188 



Family XLI. Actaonidce 188 



Genus Actteou Montfort 188 



144. traskii Stearns 188 



Subgenus Riotaxis Dall 188 



145. (R.) punctoccelata Carpenter 1S9 



Family XLI I . Tornatinidie 189 



Genus Toinatina A. AriAMS 189 



146. cerealis Gould 189 



147. culcitella Gould 190 



148. eximia Baird 190 



149. harpa Dall 191 



Geuus Volvula A. Adams 191 



150. cylindrica Carpenter 191 



Family XLI II . Scaphandridm 192 



Genus Cylichna Lovf.n 192 



151. alba Brown 192 



Family XLI V. Bullidce 193 



Genus Bulla Linne 193 



152. puuotulata A. Adams 193 



153. quoyi Gray 193 



Genus Haminea Leach 194 



154. virescens Sowerby 1 94 



Order Pulmonata 194 



Suborder Stylommatophoka 194 



SUPERFAMILY MONOTREMATA 194 



Family XL V. Helirida 194 



Genus Helix Linne 194 



Subgenus Epiphragmophora Stkobbl 194 



155. (E.) sp. iudet 195 



SUPERFAMILY HYGROPHILA 195 



Family XL VI. Limrueidce 195 



Subfamily Planorbince 195 



Genus Planorbis Guettard 195 



156. tumidus Pfeiffer 195 



157. vermicularis Gould 195 



