CHITON. 185 



The shell is oblong, a little carinated ; the intermediate valves are 

 smooth at the carina, marked ou each side with strong ribs separated 

 by deep grooves ; the lateral areas are entirely smooth, as well as the 

 end valves. The girdle is wide, extensible, covered with little 

 oblong, smooth and polished scales, largest in the middle of its 

 width. 



The colors are very variable ; sometimes marbled with black and 

 brown spots on a white ground, sometimes with some valves quite 

 black or green, the others spotted. The girdle is radiated with 

 black, gray and white. (Or 6.) 



Canary Is. (Webb and Berthelot.) 



C. cannrieims ORB., in Webb & Berth., Hist. Nat. des lies Canaries, 

 Moll., p. 99, t. 7, f. 16-19. Chiton (Lop hunts) canariensis, SHUTTLW., 

 Bern. Mittheil. 1853, p. 81. 



Allied to C. olivaceu*, but differs in having the lateral areas and 

 end valves smooth. The interior, according to Shuttleworth, is 

 green, with spots of rose and purple. This species should be com- 

 pared with C. lyratus Sowb. 



C. TULIPA Quoy & Gaimard. PL 31, figs. 43-49. 



Shell oval-oblong, elevated, acutely carinated, the side-slopes 

 nearly straight. Surface smooth and polished throughout. Ground- 

 color buff or whitish, suffused and closely mottled all over with red- 

 dish-chestnut, fawn, or purple-brown ; usually longitudinally streaked 

 on the central areas, zigzagged or tessellated on the end valves, and 

 articulated on the diagonal lines with the darker color. Sometimes 

 parts of some valves, or several whole valves are of a uniform dark 

 brown color (figs. 43, 45.) 



The central areas are smooth except for slight growth-lines and a 

 microscopic granulation which covers the whole surface. Lateral 

 urea* well raised, flat, rarely with slight radii, smooth. In the 

 excavation at the diagonal line a lens shows a few very short longitu- 

 dinal grooves, in some specimens. Tail valve elevated, with central 

 umbo. 



Interior very light blue-green, each valve rayed with brown at 

 the beaks. Anterior valves having 8, central valves 1, posterior 

 valves 12 slits; teeth pectinated. Eaves short, spongy, grooved 

 along the teeth. Sinus narrow, denticulate. 



