20 CHITON. 



long, it is distinguished by the yellow spot on each valve. 

 Inhabits the Northern seas, and adheres to the Mytilus 

 modiolus. 



ICELAND CHITON. 



28. Chiton Icelandicus. Ch. testa octovalvi, subcylindrica, tenuissime 

 punctata, nigra; limbo cinereo. Linn. Gmel. p. 3206. 



Shell of eight valves, somewhat cylindrical, very finely punctured, black, 

 margin cinereous. 



Schr'dt. Conch. 3. p. 509. No. 19. 



This small shell, which is narrow at each end, pro- 

 bably inhabits the North seas, since it adheres to the 

 Venus islandica. 



WHITE CHITON. 



29. Chiton albus. Ch. testa octovalvi Icevi, dorsata, corpore albo, Linn, 



Syst. Nat. p. 1107. Gmel. 3204. 

 Shell of eight valves, smooth, slightly ridged ; body white. 

 Chiton testa octovalvi Icevi, valvula prima postice emarginata. MutL 



Zool. Dan. Prodr. 3019. Act. Nidros. 2. p. 54. 

 Chem. Conch. 8. t. 96. f. 817. Chem. Chiton, t. 2. f. 9. Mont. Test, 



Brit. p. 4. Linn. Trans. 8. p. 22. t. 1. f. 4. 



The first valve in this shell is notched on the hinder 

 edge. The shell is smooth, of an oval shape, and about 

 three-quarters of an inch long. It inhabits the Northern 

 ocean. 



It is found, about the size of a grain of wheat, on 

 oysters and other shells on the coast of Great Britain. 

 Dr. Pulteney mentions it from Poole, and says, that 

 besides oyster shells, it is found on the Ulva intestinalis 

 and latissima. 



