Chitones. 103 



6. Chiton tVselloides. 



C. testa carinata ; valvulis (sub leute) minutissime granulatis ; 

 mamine rugoso-granulato. 



Valvuli medii dentibus 2 utriuque. 

 Valvulus l""' & ultimus dentibus 11 aut 12. 

 Icon. Tab. nost. V. f. 5. 



Shell carinated ; the valves slightly beaked, minutely, but re- 

 gularly granulated over their Avhole surface, not at all in a beaded 

 manner. Margin coarsely granulated ; the granulations raised, 

 black. Colour dark chocolate brown or black ; the ridges, edges, 

 and interstices of the valves lighter or yellowish white. Fringe 

 very short and indistinct. Length rather less than \ an inch ; 

 breadth about half the length. 



Oban, Appin ; found with the last. Very rare. 



Though in general colour and appearance this species approaches 

 near to the preceding, the dark colour even of the younger shells 

 seems to be more equally diffused over the whole of each valve. 

 They have not consequently in so decided a manner, that banded 

 appearance which is the striking peculiarity of Chemnitz's figure 

 814. 



The presence of marginal teeth in this species is a very satis- 

 factory and remarkable confirmation of its being distinct from the 

 preceding species. 



**** LiGAMENTO MARGINIS LiEVIGATO. 



7. Chiton latus. 



C. testa subovato-oblonga, lata, carinata; valvulis Isevigatis 

 politis, (sub lente) minutissime granulatis; margine simplicissimo, 

 lasvi. 



Valvuli medii dentibus 2 utrinque. 



Valvulus 1°"" dentibus 9, latis ; ultimus 8, latis. 



Icon. Tab. nost. V. f. 6 & 7. Ency. Meth. pi. 161. fig. 9 & 10, 

 Wood's Gen. Conch, pi. 3. f. 5. (excel, descrip. & synon.) ? 

 Mput. Test. Brit. p. 1. (C. marginatus), excel, synon. 



