72 | RON RS STCAN. 
| 
:1181 Parapholas penita Conr., is Pholadidea p. 
:1182 Patella aculeata Gmel. ,is Crepidula a. 
71183 Patella antiquatus L., is Hipponyx a, 
:1184 Patella insessa Hds., is Acmaea i. 
:1185 Patella instabilis Gld., is Acmaea i. 
:1186 Patelloida depicta Hds., is Acmaea d. 
21187 Patula cronkhitei Newc. 
21188 Pecten aequisulcatus Cpr., is circularis. 
71189 Pecten intermedius Conr., is subnodosus. 
:1190 Pecten tunica Phil. 1844, is latiauritus. 
21191 Pecten ventricosus Sby., is circularis. 
21192 Pectunculis corbis Mart., is Cardium c. 
:1193 Pectunculus patulus Conr., is Phacoides annulatus. 
71194 Pectunculus septentrionalis Midd., is Glycymeris s. 
21195 Penitella is Pholadidea. 
:1196 Penitella spelaea Conr., is P. penita. 
:1197 Periploma alta C. B. Ad.; argentaria Conr.; excurva 
Cpr.; and lenticularis Cby., are planiusculus. 
:1198 Petricola arcuata Desh., is carditoides. 
21199 Petricola californica Conr., is carditoides. 
71200 Petricola cordieri Desh., is Venerupis lamellifera. 
21201 Petricola cylindracea Desh., is carditoides. 
21202 Petricola gibba Midd., is carditoides. 
21203 Petricola pedroana Conr., is denticulata. 
21204 Pholadidea darwinii is rostrata. 
:1205 Pholas penita Conr., is Pholadidea p. 
21: 
1206 Physa heterostropha osculans Haldeman. 
Hannibal considers that we have only one species of Physa 
in the U. S.—heterostropha. The variety named above he con- 
siders the southern form. An extreme view, and probably no 
nearer the truth than the view that we have over 100 species, that 
many having been described. The following are some of the 
names which we seem to have failed to give in our lists of West 
American shells:— 
:1207 Physa bardi. 
:1208 Physa sparistriata Tryon. 
:1209 Physa virgata Gould. 
:1210 Placunanomia alope Gray, is Pododesma macroschisma, 
:1211 Placunanomia cepio Gray, is Pododesmus m. 
21212 Placunanomia macroschisma Desh., is Podod. m. 
:1213 Pleurotoma (Borsonia) bartschi Arnold, 1903. 
Deadman Island, San Pedro, Cal. (Pleistocene). 
:1214 Pleurotoma bartschi curta Arnold, 1903. 
San Pedro, Cal. (Pleistocene). 
71215 Pleurotoma (Dolichotoma) cooperi Arnold. 
San Pedro, Cal. (Pleistocene). 
:1216 Pleurotoma (Borsonia) dalli Arnold, 1903. 
Deadman Island, San Pedro, Cal. (Pleistocene). 
:1217 Pleurotoma (Borsonia) hooveri Arnold, 1903. 
Deadman Island, San Pedro, Cal. (Pleistocene). 
71218 Pleurotoma inermis Hds. is Drillia i. 
:1219 Pleurotoma (Leucosyrinse) pedroana Arnold, 1903. 
Deadman Island, San Pedro, Cal. (Pleistocene). 
