C. minimus and C. asellus, of Chemnitz, may be black 

 and banded varieties of this or of the next. 



Sp. 4. C. CINEREUS. 



Descr. Shell depressed, sub-carinated, minutely gra- 

 nulated ; granulations on the central areas arranged in 

 lines ; margin minutely grained ; colour various. 



Ch. cinereus, Linn. Syst. Nat. p. 1106? 



White var. C. albus, Auct ? 



Striped, C. cimex, Chemn. Conch, t. 96. 815. 



Black, C. Asellus, Zool. Journ. vol. 5. pi. 5. f. 4. 



Banded. C. minimus, Chemn. Conch ? Asellus. 

 (Young) Zool. Journ. v. 5. pi. 5. f. 3. 



Ch. cinereus and varieties, Sow. Jun. Conch Illustr. 

 Chiton, f. 94 to 98. 



Obs. The comparative roundness and flatness of the 

 shell, and the linear arrangement of the dorsal granules 

 in this species distinguish it from the preceding. The 

 white variety may have been the C. albus, of authors, 

 but there is no proof of it, and having little else than 

 colour to guide us, in reference to the ancient figures, 

 it cannot be determined whether C. Asellus, of Chemn. 

 is my black variety of C. marginatus, or Mr. Lowe's 

 black var. of this species. The same difficulty occurs 

 with respect to all the varieties. 



Sp. 5. C. cANCELLATus. Lcach ? 

 Descr. Shell elevated, narrow, with granulated 

 striae on the dorsal and lateral areas ; margin minutely 

 granular. 



