CHITON. -O 



band on each side of the dorsal ridge ; the inside is of a sea- 

 green colour, and the margin covered with greyish white 

 scales. 



tunicatus. 10. Shell with eight smooth white 

 valves, above the membrane roundish; mar- 

 gin coriaceous and reflected. 



Chiton tunicatus. Wood's Conchotomy, p. 1 1. t. 2. f. 1. 



Inhabits 



This extraordinary species has been figured from a specimen 

 in Mr. Jennings's Collection, by Mr. Wood, with the fol- 

 lowing description : " The valves, instead of being wholly 

 visible, are coated half way upwards with a black mem- 

 brane which is reflected from 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 emarginate ; of a sor- 

 did white <or flesh colour, and collectively resembling a 

 row of dried beans. The remains of a thin cortical sub- 

 stance 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 per- 

 fectly 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." 



gigas. 11. Shell with eight thick convex valves; 

 the first valve crenated, the last toothed, and 

 the intermediate ones entire. 



Chiton maximus, seu Gigas. Chemnitz, viii. p. 292. t. 96. 

 f.819. 



Chiton Gigas. Gmelin, p. 3206. Lamarck Si/st. p. 66. 

 Wood's Conch, p. 12. 



Chiton albus. Barbut, p. 8. t. 1. f. 1. 



Chiton, No. 15. Schroeter Mini. iii. p. 507. 



Eric. Methodique, t. 16 1. f. 3. 

 Inhabits the Cape of Good Hope. Chemnitz. South Seas. 



Barbut. 

 The length of the shell is generally about three, or some- 

 times more than four inches, and the colour white, with a 



blackish brown coriaceous margin. 



