100 Descriptions of British Chitones and other Shells. 



Linn. Syst. Ed. 12. p. 1107. N° 9.— Barn's Index Mas. Coejf. 

 p. 1 & 2. (fide Chemn.)— Mont. Test. Brit. p. 3.— Turton's Conch. 

 Diet. p. 34. 



Shell ovate, a little broader behind. Valves beaked, very dis- 

 tinctly and regularly granulated. Colour generally uniform 

 cinereous, sometimes dark olive, mottled or tawny yellow. Mar- 

 gin powdery, generally of the same colour as the shell, but some- 

 times mottled with white. Fringe very distinct, brown. The 

 first and last valves are marked inside with arched or radiating 

 white lines or striae, running up from the interstices of the teeth- 

 Length in general about | of an inch. Breadth about ^ the 

 length. The largest specimens I have seen (in the collection of 

 the Cambridge Philosophical Society) are about f of an inch long. 



Very common on stones and dead shells at Oban, Appin, &c. 

 It seems particularly to abound where Patella testudinaria is most 

 plentiful. I have oinitted the synonyme of Fabricius referred by 

 Chemnitz to this species. From the circumstance of Fabricius' 

 shell being described as " testa Icevi; limbo subciliaio, and cor- 

 pore rubicundo," I think it accords much better with the next 

 species. — The true C. cinereus is described by Born as having 

 '' valvae granulosce ; " and by Linnaeus as " non glabra." I 

 have never yet met with any specimens of the true C. cinereus, 

 to which the phrase " corpore rubicundo," could be properly 

 applied, but it answers very well to the following species. 



The shell described and figured under this name in the 8th Vol. 

 of the Linn. Trans, is certainly not the C. cinereus of Linnaeus 

 and Born. For exactly the same reasons as in the case of Fabri- 

 cius, with the additional one of the broad margin, I have referred 

 it to the following species, of which the figure is an excellent 

 representation^ 



The references in the text of Wood's Gen. Conch, to fig. 4 and 

 5, of pi. 3, I am convinc/ed have been accidentally reversed. Fig. 

 4, referred to for C. marginatus, is a very good representation of 

 the common sized specimens of C. cinereus, and the other presents 

 something of the broad outline of ray C. latus. 



