CHITON. 405 



shores wherever there are loose and rather smooth stones 

 between tide marks. It is scarcely ever found ranging 

 beyond the laminarian zone at farthest. It appears to 

 be of northern origin, ranging throughout the Scandi- 

 navian seas : and apparently extending to the coasts of 

 Boreal America. Its most southern habitat recorded is 

 Vigo Bay in Gallicia, where it has been taken by Mr. 

 MacAndrew. It is not included in Middendorffs list of 

 Russian Chitons. 



C. ALBus, Linnaeus? 



Resembling- marginatus, but with the dorsal granules exces- 

 sively minute and crowded, and the marginal ones large and 

 squamular. 



Plate LXII. fig. 2. 



Chiton alius, LiNN. Syst. Nat. ed. 12, p. 1107 (probably). — Maton and Rack. 

 Trans. Linn. Soc. vol. viii. p. 22 (from last), pi. 1, f. 4 (uncer- 

 tain). — Lowe, Zoolog. Journ. vol. iii. p. 80. — Fleming, Brit. 

 Animals, p. 290. — Brit. Marine Conch, p. 129. — Brown, Illust. 

 Conch. G. B, p. 66, pi. 21, f. 2 ?— 0. Fabric. Fauna Greenland, 

 p. 422. — Chemn. Conch. Cab. vol. viii. p. 290, pi. 96, f. 317 

 (badly). — Sowerby, Conch. 111. Chiton, f. 99, 100. — Gould, 

 Invert. Massach. p. 150, f. 21. — Loven, Index Moll. Skandin. 

 p. 27. — MiDDENDORFF, Malacozool. Rossica, pt. 1, p. 120. 



„ aselloides, Lowe, Zoolog. Journ. vol. ii. p. 103, pi. 5, f. 5. — Annals Philos. 

 1825, p. 387.— Brown, Illust. Conch. G. B.p. 66. 



„ sac/rinatus, Couthouy, Boston Journ. Nat. Hist. vol. ii. p. 82. 



The characters of this species are by no means striking, 

 and the shell, without careful attention, may be confused 

 with niarginafus, from which the greater coarseness of 

 the ligamental scales, in proportion to the granules of the 

 testaceous plates, affords the readiest mark of distinction. 

 It is small, oval-oblong, rather elevated, more or less 

 angulated dorsally, and of an uniform white or yellowish 

 white, but often crusted wholly or partially with a black 



