TURBO. 855 



Junior. Shell minute. 

 Turbo Clathratulus. Adams's Micros, p. 627. t. 14. f. 19. 

 Walker's Minute Shells, f. 45. 



Inhabits the coasts of Great Britain. Pennant, ^c. 



Shell half, or sometimes three quarters of an inch long, and is 

 rather broader in proportion to the length, and much thinner 

 and more pelkicid than T. Clathrus; it also differs in having 

 the longitudinal ribs very thin and slender, and almost twice 

 as numerous ; a specimen now before me has eight much 

 rounded whirls, and eighteen very thin longitudinal membra- 

 naceous ribs on the body-whirl, and is of a snowy white, 

 without any coloured markings. 



PULCHER. 91. Shell imperforate, turreted, with con- 

 tiguous whirls, and strong distant longitudi- 

 nal ribs, ending in a transverse keel on the 

 body-whirl. 



Turbo Clathrus, Var. $. Gmelin, p. 3603. 

 Turbo, No. 133. Schroeter Einl. ii. p. 108. 

 Lister Conch, t. 588. f. 50. 



Inhabits the coasts of the West India Islands. 



This shell is nearly allied to T. Clathrus, and of about the 

 same size, but differs in having the whirls less rounded, and 

 the longitudinal ribs, instead of being extended over the 

 base, terminating in a strong transverse rib on the body- 

 whirl, and the base is flattened ,• the colour is often wholly 

 white, or sometimes brownish or of a lead-colour, with the 

 ribs white. 



AMBiGuus. 92. Shell umbilicated, turreted, cancel- 

 lated, with the whirls smooth and conti- 

 guous. 



Turbo ambiguus. Linnaus Syst. Nat. p. 1237. Gmelin, 

 p. 3604. 



Inhabits the Mediterranean. Linnaus. 



Linnaeus says that this shell very much resembles T. Clathrus, 

 except in its being perforated, and in having twice as many 

 longitudinal ribs ; he has described it to be of a pale colour, 

 with two or three transverse ferruginous lines on each whirl. 



CRENATUs. 93. Shell turreted, with the whirls cre- 

 nated at their upper margins ; aperture mar- 

 ginated, and the base keeled. 



Turbo crenatus. Linnaus Syst. Nat. p. 12S8. Gmelin, 



t2 



