CHITON. 21 



BORDERED CHITON. 

 PI. 3./. 4. 



30. Chiton marghiatus. Ch. testa octovalvi, margine serrato rcjlexo Icevi. 

 Linn. Gmel. p. 3206. 



Shell of eight valves, smooth, with a serrated reflected margin. 

 Oscabrion Gallicum, Argenv. Conch, t. 25. f. M. Penn. Br. Zool. ed. 



1812. 4. pi. 39. f. 2. Mont. Test. Brit. p. 1. Linn. Trans. 8. p. 21. 



t. 1. f. 2. 



This shell is of a reddish-brown colour, and of an 

 oblong shape. The valves are carinated and vary in 

 colour. It is about the size of a millepede, and is found 

 on several of the coasts of Great Britain, attached to 

 oyster and other shells. 



The C. septemvalvis described by Mr. Montagu, he 

 is now inclined to refer to this shell as an accidental 

 variety only, and not a distinct species. 



ASH-COLOURED CHITON. 

 PI. 3. /. 5. 



31. Chiton cinereus. Ch. testa octovalvi leevi carinata, corpore rubi- 

 cundo, limbo subciliato. Linn. Gmel. p. 3204. Fabr. Fn. Grcenl. 

 p. 423. 



Shell of eight valves, smooth and carinated ; body reddish, margin some- 

 what ciliated. 



Testa octovalvi ovata. Linn. Si/st. Nat. ed. 12. p. 1107. 



Born. Mus. Caes. 1. 1. f. 3. Chem. Conch. 8. t. 96. f. 818. Encyclop. 

 Method, pi. 161. f. 11. Mont. Test. Brit. p. 3. Linn. Trans. 8. 

 p. 22. pi. 1. f. 3. 



The cinereous Chiton is of an oval shape, compressed 

 and carinated, and from a quarter to three-quarters of 

 an inch long. When the animal is alive the shell is 

 reddish, but becomes grey after death. The valves on 

 the back project into a beak, and, as the figure expresses, 



