240 Lamarck's Genera of Shells. 



Type. Clausilia torticollis *. 



Shell reverse, cylindrical, truncated ; strise straight, ferrugi- 

 nous-red ; neck narrow, angular, and arched ; aperture without 

 teeth. Isle of Candy. PI. VII. Fig. 135.— 12 Species. 



7. BULIMUS t. 



Shell oval, oblong, or turrited; aperture entire, longitudinal; 

 margins very unequal, disunited at the upper part. Columella 

 straight, smooth ; no truncation or notch at the base. 



The last whorl of the spire of the bulimus is larger than the 

 penultimate ; the shell is never orbicular, like the helix ; and 

 it differs from the pupa, by the great inequality of the two 

 margins of the aperture, the right of which is sometimes con- 

 siderably thickened. 



Type. Bulimus hamastomus X- (Helix oblonga. Gmel.) 



Shell ovate-oblong, ventricose, subperforate, longitudinally 

 striated, whitish-yellow ; lip and columella purple. Guyana. 

 PI. VII. Fig. 136.— 34 Species. 



8. ACHATINA. 



Shell oval or oblong; aperture entire, longitudinal; right 

 margin sharp, never reflected. Columella smooth, truncated at 

 the base. 



This genus is well distinguished from the preceding, by the 

 right margin never being rellected, and by wanting that on the 

 left; the columella being always naked, very smooth, and trun- 

 cated at the base. 



Lamarck subdivides the genus into, 1. Those shells which 

 have the last whorl ventricose, and not depressed, — 12 Spe- 

 cies ; and, 2. Those with it depressed, and attenuated towards 

 the base, — 7 Species. 



Type. Achatina perdix §. (T3ulla achatina. Linn.) 



Shell very large, ovate-oblong, ventricose, decussated, white, 

 apex rosy; light red, wavy, longitudinal streaks; columella 

 violet-purple ; interior of the lip white. Antilles. PI. VII. Fig. 

 137. — In all, 19 Species. 



* Wi'y-tieclccd. 



t SaXijwo?, insittiahlc hunger. What title this genus has to so strange a 

 name, we know not. 

 i Bloody-mouth. Lamarck's secon I species. His type is B. oiatus. 

 ^ A pmiriilge. 



