CHITON. 161 



The lateral areas are very little raised, and sculptured with about 

 10 small subobsolete radiating riblets ; central areas closely and 

 finely sculptured with longitudinal riblets separated by deeper 

 interstices. Posterior valve having the umbo near the front margin, 

 the slope behind it straight. 



Interior light blue; sutural plates wide; sinus square, finely 

 toothed. Anterior valve having 9-12, central valves 1, posterior 

 valve 1 2-14 slits ; teeth stout, blunt, deeply pectinated. Eaves very 

 short and narrow, spongy. 



Girdle (fig. 24) strong, covered with shining, convex, imbricating 

 scales. 



Length 95, breadth 60 mill. ; divergence 120. 



Valparaiso., Chili. 



Chiton magnificus DH., Diet. Class, des Sc. Nat. xii, p. 455 ; 

 Encycl. Meth., p. 680.; Lam., An. s. Vert., ed. Dh., vii, p. 498. 

 REEVE, Conch. Icon., t. 1, f. 3. Chiton latus SOWERBY, Catal. Sh. 

 Tankerv., appendix, p. v, (not Ch. latus Lowe). Chiton olivaceus 

 FREMBLY, Zool. Journ. iii, p. 199, Suppl. pi. 16, f. 4. Chiton 

 striatus BARNES, Amer. Journ. of Science vii, p. 70, t. 3, f. l.(1824). 

 Not C. striatus of authors. 



This large olive-black, blue-dotted species is remarkable for the 

 evenness and smoothness of its sculpture. It is an unusually hand- 

 some Chiton. 



C. MURRAYI Haddou. PI. 29, figs. 15-21. 



Shell apparently smooth, but really very closely and finely 

 striated, the striae being roughened or interrupted ; greatly depressed. 



Anterior valve with radial striae ; under surface with eleven dis- 

 tinct square slits, radial grooves distinct and perforated ; teeth of 

 insertion plate serrate. Intermediate valves narrow, flattened, 

 non-carinate, with sharp depressed umbo, surface striae longitudinal 

 in central areas, radial in the lateral areas ; lateral areas distinct, 

 with slight-concentric rugae, and with three or four scarcely apparent 

 peripheral radial ridges, which die away toward the apex ; sutural 

 laminae shallow, a single lateral slit, lateral insertion plates serrate ; 

 jugum with nine rounded teeth, the central being very small. Pos- 

 terior valve flattened, slightly umbonate, striae longitudinal on 

 the anterior area, radial on the posterior area ; under surface with 

 seventeen distinct slits, teeth serrate ; jugum finely toothed. 

 11 



