396 
Odontostoma, Phil. II 
Odontostomia, Jeff. II 
Odontostomus, Beck. III 
Odontotrochus, Fisch. II 
Odontura, Crosse & F. III 
Odostomia, Fleming. II 
Odostomia, Moq.-Tan. III 
(Kcoptychus, Neum. II 
(icotraustes, Waagen. IT 
(idalina; Carp: 9...” ET 
(Enone, Hartman. LM 
Oithona, Ald. & Han. I 
Olana, Hod A; Ad: «7 dit 
Olcostephanus, Neum. II 
Oleacina, Bolten. . III 
Gleacimide,.\5 05...) URL 
Oligolimax, Fischer. ITI 
Oligoptycha, Meek. IT 
Oligoptychia, Bottgr. III 
Oligotoma, Bell. .° . 11 
Oiiovra Say.’ it j4 lil 
Oliv a, Brug. : II 
Oliv ancillaria, a’ Orb. ih 
Olivella, Swains. = ee 
Olivia, Cantr.: > 6. a7 
Olividee: cs) ic eee, UL 
Obyvine.d’ Orb... ut, Ul 
OhyulasConrs |.) II 
Olympia, Vest..—.... TU 
Omala, Schum, .. . VET 
Omalaxis, Desh. . II 
Omalia, Ryckholt.. III 
Omalogyra, Jeffreys. II 
Omalonyx, d’Orb. . III 
Ommatostrephes,d’Or. II 
Ommatostrephide. II 
oe II 
Omphalia, De Haan. II 
Omphalia, Zekeli. .. UO 
Omphalina, Raf. . III 
Omphalius, Philippi. If 
Omphalocirrus, Ryck. II 
Omphaloclathrum, KI. [1 
Omphaloptyx, B ttor. i 
Omphalostyla, Schl. III 
Omphalotrochus, Mk. II 
INDEX. 
PAGE 
236 | Omphalotropis, Pfr. 
236 | Omphiscola, Rafin. 
55 | Oncea, Gistel. -. 
312 | Onchidella, Gray. 
40 | Onchidina, Semper. 
236 | Onchidiopsis, Bergh. 
TL Onchidium, Buch. . 
80 | Onchidora, Cuy. 
78 | Onchidoris, Blainv. 
164 | Onchidorus, Fer. 
56 | Onchis, Fer. 
338 Oncidiide, ‘ 
330 Oncidiodoris, Agas. 
84 | Oncoceras, Hall. 
14 Oaecehaae Petho. 
13 | Oncodoris, Agass. . 
20 | Oncoma, Mayer. 
358 | Oncomelania, Gred. 
77 | Oncophora, Rzhak. 
186 | Oncus, Agass. 
291 | Oniscia, Sowb. 
174 | Oniscidia, Swains. . 
175 | Onithochiton, Gray. 
174 | Onkospira, Zittel. . 
314 | Onoba, H. & A. Ad. 
174 Onustide. . : 
174 | Onustus, H. & A. Ad. 
177 | Ony chia, Lesueur. . 
78 | Onychoteuthide, 
169 as : 
219 | Onychoteuthis, Lich. 
182. Oonia, Gemm. 
218 | Oopelta, Morch. 
87 | Oospira, Bottger. . 
34,| Opalia, H. a Az Ad. 
13 | Opeas, Albers. 
34 | Operculatum, Linn. 
57 | Ophicardelus, Beck. 
225 | Ophiceras, Griesb. . 
23 | Ophidioceras, Barr. 
310 | Ophileta, Vanuxem. 
218 | Ophioceras, Hyatt. 
176 | Ophiodermis, A gass. 
16 | Ophiogyra, Albers. 
53 | Opilolimax, 
218 | Opis, Defrance. 
