UNIVALVES. — TURBO. 121 



South seas; some are from the American and African 

 oceans, and the Indian and Northern seas; and several 

 species are to be met with in the Mediterranean, and Euro- 

 pean seas. 



TURBO— Wreath. 

 Division I. — Shell imperforate, and the pillar-lip 



FLAT. 



Family 1. — WWi a smooth exterior. 

 Obtusatus — Blunt. *Rudi3 — Pale-brown. 



Neritoides — Nerite-shaped. Punctatus — Punctured, 



Nicobaricus — Nicobar. *Petrseus — Small-rock. 



Nigerrimus — Black. *Fulgidus — Bronze-banded. 



Family 2. — With the exterior striated or ribbed. 

 *Littoreus — Periwinkle. *Crassior — Coarse. 



*Tenebrosus — Chocolate. *Jugosus — Lineated. 



Ethiops — Black and white. 



Division TI. — Shell imperforate, solid. 

 Family 1. — With a smooth exterior. 

 Personatus — Convex. Cidaris — Turban. 



Petholatus — Serpenf s-skin. Helicinus — Green and purple. 



Imperialis — Imperial. 



Family 2. — With the exterior striated. 

 *Cimex — Bug. Cochlus — Cameleopard. 



*Calathiscus — Cancellated. Smaragdus — Green. 



Family 3. — With the exterior granulated. 

 Castaneus — Chesmit. Crenulatus — Crenulated. ' 



Papyraceus — Paper. 



Family 4. — With the exterior nodulous. 

 Trochiformis — White- grained. Sarmaticus — Large-knobbed. 

 Marmoratus — Marbled. Olearius — Large-keeled. 



Coronatus — Coronated. 



