ipa vag ean | ; 70 t are Gas Ye 
21:1097 Megerlia ielieeses Dall, is Laqueusg j. 
21:1098 Genus Metis H. & A. Ad., 1856. 
21:1099 Metis alta Conr., 1837. 3217, (291). 
Santa Barbara, Cal., to Magdalena bay, Baja Cal. 
21:1100 Miralda californica Dall & Bartsch. 
21:1101 Mitra maura, of Cal. lists, is M. idae, 
21:1102 Modelia striata Gabb, is Lacuna sgolidula. 
21:1103 Modiolaria Beck, 1846, is Musculus, 
21:1104 Monia Gray, is sec. of Pododesmus. | 
21:1105 Monoceros brevidens Conr., is Acanthina lapilloides, 
21:1106 Monoceros pnctatum Gray, is Acanthina lapilloides. 4 
21:1107 Monoceros unicarinatum Rve., is Acanthina engonata. ; 
21:1108 Mouretia reticulata Sby., is Gadinia r. 
21:1109 Murex barbarensis Gabb, is Ocinebra b. 
21:1110 Murex belcheri Hds., is Trophon b. 
21:1111 Murex californicus Hds., is trialatus, | 
21:1112 Murex multicostatus Esch., is Trophon m, 
21:1113 Murex nux Rve., is Coralliophila n. 
21:1114 Murex peritus Hds., igs Ocinebra p. 
21:1115 Muricidea californica Hds., is Murex trialatus, 
21:1116 Muricidea paucivaricata Gabb., is Murex monoceros, 
21:1117 Mya californica: Conr., is Cryptomya Cc. 
21:1118 Mya cancellatus Conr., is Platyodon ec, 
_21:1119 Mya hemphillii Nowcomb, Cal Ac, Proc, 5: 415, is aren. 
aria, 
21:1120 Mysia—see Diplodonta. 
21:1121 Mytilus bifurcatus Conr., is Septifer b. 
21:1122 Mytilus pedroanus Conr., is edulis. . 
21:1123 Myurella simplex Cpr., is Terebra s. 
21;:1124 Nacella depicta Hds.; insessa Hds.; instabflis Gid.; pa- 
leacea Gld.; all proved species of Acmaea, of same names, 
21:1125 Nassa gibbsii Cooper, is mendica. 
21:1126 Nassa interstriata Conr., is perpinguis, 
21:1127 Nassa pedroana Conr., is Columbella gausapata, 
21:1128 Nassa woodwardi .Fbs., is mendica. 
21:1129 Natica algida Gld., is Polinices lewisil. 
21:1130 Natica lewissii Gid., is Polinices 1. . 
21:1144 Ocinebra michaeli Ford. 
Type locality:—Cayucos, San. Luis Obispo county, Cal., dis- 
covered by George W. Michael; color light gray, with a median 
band of brown; length about 
21:1145 Odostomia pupiformis, is satura. 
21:1146 Oedalina—see Cooperella. 
21:1147 Olivella boetica Cpr. is pedroana. 
21:1148 Olivella pedroana Conr. 
Shell rather slender, with tapering spire, thin Hp, usually 
bluish in color. 
21:1149 Omphalius fuscescens Phil., is Tegula ligulatum. 
21:1150 Omphalius ligulatus Mke., is Tegula 1. 
21:1151 Omphalius pfeifferi Phil., is Tegula montereyi. 
21:1152 Ondina De Folin, is Evalea. 
21:1153 Opalia H. & A. Ad., is subg. of Epitonium. 
21:1154 Oreohelix castanea. 
21:1155 Oreohelix cooperi. 
21:1156 Oreohelix elrodi Pilsbry. Montana, 
21:1157 Oreohelix haydeni Gabb. 
21:1158 Oreohelix hemphilli, : 
