396 



INDEX. 



Odontostoma, Phil. II 

 Odontostomia, Jeff. II 

 Odontostomus, Beck. Ill 

 OdontotrochuSjFisch. II 

 Odontura, Crosse & F. Ill 

 Odostomia, Fleming. II 

 Odostomia, Moq.-Taii. Ill 

 CEcoptj'cbus, Neum. II 

 QEcotrausteSjWaagen. II 

 (Edaliua, Carp. . . Ill 

 (Eiione, Hartman. Ill 

 Oithona, Aid. & Han. II 

 Olana, H. & A. Ad. II 

 Olcostephanus, Neum. II 

 Oleacina, Bolten. . Ill 

 Oleaciniclse, . . . Ill 

 Oligolimax, Fischer. Ill 

 Oligoptycha, Meek. II 

 Oligoptj'chia, Bottgr. Ill 

 Oligotoma, Bell. . II 

 Oligyra, Say. . . II 

 Oliva, Brug. ... II 

 Olivancillaria, d'Orb. II 

 Glivella, Swains. . II 

 Olivia, Cantr. . . II 

 Olividse, .... II 

 Olivina, d'Orb. . . II 

 Olivula, Conr. . . II 

 Olympia, Vest. . . Ill 

 Omala, Schum. . . Ill 

 Omalaxis, Desh. . II 

 Omalia, Kyckholt. . Ill 

 Omalogyra, Jeffreys. II 

 Omalonyx, d'Orb. . Ill 

 Onimatostrephes,d'0r. II 

 Ommatostrephidse. II 

 II 

 Omphalia, De Haan. II 

 Oniphalia, Zekeli. . II 

 Omphalina, Raf. . Ill 

 Om phallus, Philippi. II 

 Omphalocirrus, Ryck. II 

 Omphaloclathrnm,Kl. Ill 

 Omphaloptyx, B';ttgr. Ill 

 Omphalostyla, Schl. Ill 

 Omphalolrochus, Mk. II 



PAGE 



236 

 236 



55 

 312 



40 

 236 



n 



80 



18 



164 



56 



338 



335 



84 



14 



13 



20 



358 



7Y 



186 



291 



lU 



175 



lU 



314 



174 



174 



177 



■ 78 



169 



219 



182 



218 



87 



34 



13 



34 



57 



225 



23 



310 



218 



176 



16 



53 



218 



Omphalotropis, Pfr. 

 Omphiscola, Rafln. 

 Oncsea, Gristel. . . 

 Onchidella, Gray. . 

 Onchidina, Semper. 

 Onchidiopsis, Bergh. 

 Onchidium, Buch. . 

 Onchidora, Cuv. 

 Onehidoris, Blainv. 

 Onchidorus, Fer. . 

 Onchis, Fer. . . . 

 Oncidiidse, . . . 

 Oncidiodoris, Agas. 

 Oncoceras, Hall. 

 Oncochilus, Petho. 

 Oncodoris, Agass. . 

 Oncoma, Mayer. 

 Oncomelania, Gred. 

 Oncophora, Rzhak. 

 Oncus, Agass. . . 

 Oniscia, Sowb. . . 

 Oniscidia, Swains. . 

 Onithochiton, Gray. 

 Onkospira, Zittel. . 

 Onoba, H. & A. Ad. 



Onustidse 



Ontistus, H. & A. Ad. 

 Onychia, Lesueur. . 

 Onychotenthidse, . 



Onychotenthis, Lich 

 Oonia, Gemm. . . 

 Oopelta, Morch. 

 Oospira, Biittger. . 

 Opalia, H. & A. Ad 

 Opeas, Albers. . . 

 Operculatum, Linn. 

 Ophicardelus, Beck. 

 Ophiceras, Griesb. . 

 Ophidioceras, Barr. 

 Ophileta, Yanuxem. 

 Ophioceras , Hyatt. 

 Ophiodermi^, Agass. Ill 

 Ophiogyra, Albers. Ill 

 Opilolimax, . . . Ill 

 Opis, Defrance. . Ill 



II 



III 



III 



III 



III 



II 



III 



II 



II 



II 



III 



III 



II 



II 



II 



II 



II 



II 



III 



III 



II 



II 



II 



II 



II 



II 



II 



II 



II 



II 



II 



II 



III 



III 



II 



III 



II 



III 



II 



II 



II 



II 



PAGE 



280 



101 



59 



91 



91 



210 



91 



372 



372 



372 



92 



90 



372 



54 



294 



372 



190 



253 



173 



92 



202 



202 



345 



307 



264 



215 



215 



32 



13 



31 



31 



233 



82 



76 



221 



61 



367 



96 



77 



56 



220 



75 



32 



33 



79 



230 



