OLIVA.— Plate XXI. 



Figs. 

 334, 335. TESTACEA, 1 36, Lamk. — Mazatlan. 



336-840. MEGALOSTOMA, 137, Meuseh. — 0. hiatula, Gmel. — 

 Francady River ; Corisco Bay, Mr. Keen. 



341-343. PALLIDA, 138, Swainson. — 0. maculosa, Sw. O.in- 

 dusica, Reeve. — West Africa. 



344, 345. INTEICATA, 140, Marrat. — Africa. 



346. ANCiLLAEOiDES, 141, Reeve. — Mouth of the Indus. 



347. NiTELLiNA, 142, Duclos. — Hab. ? 



348, 349. coLUMELLARis, 143, Soivb. — Mazatlan. 



350,351. SEMiSTRiATA, 144, Gray. — West Columbia. 



352. APPiNis, 145, Marrat. — Acapulco. 



353. ATTENUATA, 146, Recve. — California. 



354. ZONALIS, 147, Duclos. — Florida, California. 



355. FiMBEiATA, 148, ReevB. — West Indies. 



356-358. PUSiLLA, 150, Marrat. — Gulf of Florida, Reeve. 



359-361. MUTicA, 151, Say. — 0. zigzag, Duclos. 0. niti- 

 (and 465-467). dida, Chemn. O. nana, Laink. (Reeve). — 

 West Indies ; Red Sea ; North America. 



