12 CHITON. 



the coriaceous border, and fixed into a groove cut for 

 that purpose round the upper part of each valve. The 

 portion that is seen above the membrane, is roundish, 

 uneven, and eniarginate, of a sordid white, or flesh co- 

 lour, and collectively resembling a row of dried beans. 

 The remains of a thin cortical substance is to be seen on 

 parts of the naked shell, which, independent of the 

 coriaceous membrane, once covered the valves. The 

 valves within side are quite exposed and perfectly white. 

 The shell is an inch and a quarter broad, and when 

 extended, four inches long. Mr. Humphrey once had a 

 specimen from Copenhagen, but cannot say that it 

 inhabits the North Seas. 



GIGANTIC CHITON. 



11. Chiton gigas. Ch. testa octovalvi crassa convexa alba, valva prima cre- 

 nata, postrema dentata, mediis emarginatis. Linn. Gmel. p. 3206. 



Shell of eight valves, thick, convex, and white : first valve indented, the 

 last toothed, middle valves emarginate. 



Chem. Conch. 8. t. 96. f. 819. Chem. Chit. t. 2. f. 10. 



Encyclop. Method, pi. 161. f. 3. 



Chiton albus. Barbut. pi. 1. f. 1. 



The Gigantic Chiton exceeds four inches in length, 

 and except the following species, is the largest of the 

 genus. The valves have a very clumsy appearance, and 

 seem to be rudely folded over each other. The margin 

 is tumid, coriaceous, and of a black-brown colour. 

 This Chiton inhabits the Cape of Good Hope. 



Barbut has figured this shell by the name of albus. 

 He says that the specimen was brought by Dr. Solander 

 from the South Sea ; probably, however, taken at the 

 Cape, where it has been ascertained to live. The French 

 have copied Chemnitz. 



