Chit ones. 97 



Dorset Cat. p. 1. f. 1. (male). -^Wood's Gen. Conch, pi. 2. f. 6. 

 —Linn. Trans. VIII. p. 1. f. 1. (male).— Mont. Test. Brit. pi. 27. 

 f. 5.— Sowerb. Gen. Chiton, f. — Leach's British Moll, (ined.) 

 pi. X. f. 8. 



Linn. Syst. Ed. 12. p. 1106. No. 4.— Linn. Gmel. p. 3202. 

 (fide Linn, Trans). Lamarck, Anim. 6. p. 



Shell less carinated and convex than in the next species. 

 Valves with a few longitudinal striae down the middle, which are 

 very often obliterated by the decortication of the valves ; their 

 sides coarsely granulated. The first and last valves are without 

 the longitudinal striae down their centre, but are granulated all 

 over. The granulations are coarse, elevated, obtuse, distinct to 

 the naked eye ; larger than in any of the following species. Mar- 

 gin coarsely granulated, more or less spinous, furnished with tufts 

 of grey bristles rather than hairs, placed at the interstices of the 

 middle valves, and also round the first and last. The marginal 

 teeth of the last valve are variable ; sometimes there are two 

 notches on each side, and the intermediate space crenulated ; and 

 sometimes these crenulations are so deep that it would perhaps 

 be more proper to describe the last valve as toothed in the mid- 

 dle to within a short distance of either extremity. Colour cine- 

 reous or dark olive ; sometimes nearly white by decortication. 

 Fringe of the margin bristly, very distinct. Length from a quarter 

 to three quarters of an inch. Breadth about half the length. 



Oban, Argyleshire; not very common. Appin, not unfrequent. 

 It is rather extraordinary there should not be a single good repre- 

 sentation of a British specimen of this common species. The best 

 is that in Leach's British MoUusca, though the tufts on the mar- 

 gin are not well expressed. 



** LiGAMENTO MARGINIS STUIATO. 



2. Chiton laevis. 



C. testa carinata, elevata, convexiore ; valvulis laevigatis, polltis 

 (sub. lente) minutissime granulatis ; margiue lato expanso, exilis- 

 sime reticulato. 



Vol. IL g 



