168 CHITON. 



Interior whitish clouded with olive-plumbeous posteriorly and on 

 the sutural-laminre ; sutural-plates wide, sinus rounded, toothed; 

 anterior valve having 14-15, central valves 1, posterior valve 15-18 

 slits ; teeth blunt, pectinated ; eaves short, spongy. The sutural 

 lamina? are smooth inside, the anterior-median tract is finely ivrinkled 

 transversely, the posterior tract is punctate. 



Girdle clothed with coarse, angularly-convex, imbricating scales. 



Length 40, breadth 26 mill. 



Gulf of Pendas, Patagonia ; Valparaiso, Chili. 



Chiton granoxns FREMBLY, Zool. Journ. iii, p. 200, suppl. pi. 17, 

 f. 1 (1827). DH. in Lmk., An. s. Vert, iii, p. 500. SOWB., Conch. 

 Illustr., p. 2 ; Moll. jBeechey's Voyage of H. M. S. ' Blossom,' t. 

 40, f. 5. REEVE, Conch. Icon., t. 5, f. 27. Lophyru* granosn* TAP. 

 CAN. Viag. ' Magenta ' p. 75. 



The pustulose lateral areas and end valves and the black, two- 

 striped color-pattern are the stronger features of the exterior of this 

 species; and the interior is no less strongly marked by the trans- 

 verse wrinkling of the front part of each valve, which may be readily 

 seen under the lens without dis-articulating the shell. This wrink- 

 ling in other species is confined to a band the width of the sinus, and 

 is much less strongly developed. The second valve is broad and 

 beaked, with only a narrow smooth dorsal line : the following valves 

 have a distinct smooth band. 



C. STRIATOSQUAMOSUS Carpenter. 



Shell subrotund, depressed, pale brown-olive; entire surface of the 

 valves densely granulated ; lateral areas rather distinct, valves wide, 

 slightly curved, scarcely beaked; jugum scarcely distinct, very 

 delicately longitudinally striated, lateral margins plauate ; mucro 

 superior, slightly distinct. 



Girdle furnished with solid, oval, large hardly crowded scales, 

 part deeply striated ; margins of the valves serrated ; median valves 

 with a single slit on each side, end valves having about 12 slits; 

 sutural-plates large, strongly arcuate. 



Length 41, breadth 3, alt. 1 mill.; divergence 140. (Cjpr.) 



Mazatlan, on Spondylus caldfer. 



Lophyrus striato-xqnamosus CPR., Cat. Mazat. Sh., p. 192. 



