most correct to retain for the shell of Chemnitz, his 

 figure being the oldest, and universally quoted. The 

 general appearance and the strong central band of 

 striae in Pennant's figure, leave no doubt on my mind 

 that he intended to represent the shell to which we have 

 fixed the name proposed by him. 



Sp. 3. C. MARGINATUS. 



Descr. Shell oval, carinated. elevated, posteriorly 

 widened, minutely granulated ; margin also minutely 

 granulated ; colour various. 



Ch. marginatus, Pennant, Brit. Zool. Wood. Gen. 

 Conch, f. 4. 



Ch. cinereus, Zool. Jour. v. 5. p. 99. Wood Gen. 

 Conch, f. 5. Chemn. Conch. 96. f. 818 ? 



Red var, C. ruber? Chemn. Conch, t. 96. f. 813.. 



Blackvai". C. Asellus, Chemn.Conch. t. 96. f.816. 



Banded var. C. minimus, Chemn.Conch. t. 96. f. 814 



C. marginatus and varieties. Sow. Jun. Conch. II- 

 lustr. f. 106 to 112, 



Obs. This common species, including many varieties 

 in colour, is more clearly referrible to C. Marginatus, 

 of Pennant, than to C. cinereus, of authoi's ; and with- 

 out presuming to decide whether the description of 

 Linnaeus and the figure of Chemnitz were taken from 

 ash coloured varieties of this or of the following species, 

 I prefer applying the respective names as used by col- 

 lectors at present. C. marginatus is more angular 

 than the next species, and the granulations on the 

 dorsal areas are not arranged in longitudinal lines. 



