22 chiton'; 



are sometimes tipped with white, so as to form a dorsal 

 line : the margin is spotted. 



Fabricius found this species among the roots of 

 uIvcb on the Norway coast. It occurs, though not com- 

 monly, on the British shore, in Devonshire, at Wey- 

 mouth, and at Poole, attached to rocks and oysters. 



SMOOTH CHITON. 



32. Chiton lsevis. Ch. testa octovalvi glaberrima, dorso elevate Linn. 

 Trans. 8. p. 21. Linn. Gmel. p. 3206. 



Shell of eight valves, very smooth, with a raised back. 



Penn. Br. Zool. ed. 1812. 4. pi. 39. f. 3. Mont. Test. Brit. p. 2. 



This Chiton is of a reddish-brown colour, sometimes 

 spotted with yellow, and often with a longitudinal line 

 down the back : the margin broad and finely reticulated. 

 It is the size of a wood-louse, and, according to Pen- 

 nant, inhabits the shores of Loch Broom, in West 

 Rothshire. Mr. Montagu has found it with the 

 C. marginatus, in Salcomb Bay, 



** With Seven Valves. 



TUBERCULATED CHITON, 



33. Chiton tuberculatum. Ch. testa septemvalvi, corpore tuberculato. 

 Linn. Syst. Nat. ed. 12. p. 1106. 



Shell of seven valves, body tuberculated. 



Chiton oscabrion. Mus. Ad. Fr. p. 96. 



Chiton cylindricus. Schroter Conch. 3. p. 394. t. 9. f. 19. 



This species is of an oblong shape, covered with 

 tubercles placed in a quincunx order, the sides cinereous 

 mixed with white, and marked with brown waved 

 bands: on the back, which is greenish, runs a broad 

 black band. It inhabits South America. 



