UNIVALVES. TROCHUS. 1 1 5 



ther-of-pearl appearance when uncoated ; others have only 

 their aperture pearly or silvery j and a few exhibit a bronze- 

 like hue. 



There are several reverse varieties of Trochi : the prin- 

 cipal are T. perversus, T. undulatus, T. ventricosus, T. 

 annulatus, and T. pusillus; the latter of which is found 

 within larger shells, in the sands of India. 



The T. flumineus is a river species, and the T. horten- 

 sis is an inhabitant of the gardens in warmer climates. 

 The T. terrestris is also a land species, and frequents the 

 mountains of Cumberland. 



The following are the places which yield specimens of 

 the Trochi: viz. Asia, Africa, America, Friendly Isles, 

 New Zealand, Red Sea, Mediterranean, the European and 

 British seas, &c. 



TROCHUS Top- Shell. 



DIVISION I. SHELL UMBILICATED, ERECT. 

 FAMILY 1. With the pillar and umbilicus smooth. 



Niloticus Large-marble. Fanulum Pagoda. 



Conus Conic. Strigosus Black-lipp'd. 



Spinosus Thorny. Dubius Doubtful. 



Jujubinus Mottled. Depressus Depressed. 



Concavus Concave. Lsevis Smooth. 



Vernalis Green. Groenlandicus Greenland. 



Conspersus Poppy. *Magus Tuberculated. 



Ochroleucus Whitish- brown. Variegatus Variegated. 



Stellatus Starred. Afer Grey-marble. 



Spengleri Spengler's. Muricatus Prickly. 



Costatus Ribbed. Roseus Rose-colour' d. 



Insequalis Unequal. *Patholatus Tumid. 



Regius Royal. Scaber Rough. 



Verrucosus Warty. Quadratus Square-spotted. 



Radiatus Radiated. Croceus Saffron-colour' d. 



Viridis Green, Varius Varied. 



