CALLOCHITON. 67 



imen illustrated. The median valves have an obtuse, projecting beak, 

 the back margin being concave on each side of it, and they are nar- 

 rowly rounded at the sides, broadly con cave in the middle in front (fig. 

 22). The granulation is hardly visible; the lateral areas are white, 

 central areas red. The dorsal angle is blunt ; divergence about 

 110. The T. sitchensis Midd., which has not been identified since 

 Middendorff's time, should be compared with this species. 



Genus CALLOCHITON Gray. 



See vol. xiv, p. 48. Add to synonymy of the genus: Clathro- 

 pleura TIBERI (part), Bull. Soc. Mai. Ital. iii, p. 136, 1877. First 

 species C. Icevis. 



C. L^EVIS Montagu. Vol. xiv, p. 49. 



As an additional synonym, is probably to be ranked Chiton 

 euplcece O. G. Costa, Cat. Syst. e Rag. Test, due SiciL, p. i, iv, t. 1, 

 f. 4, 1829. 



C. CROCINUS Reeve. Vol. xiv, pi. 10, fig. 7. 



Shell ovate ; terminal valves and lateral areas of the rest concen- 

 trically sculptured with waved wrinkles, the surface being most 

 minutely punctured ; central areas undulately decussated with 

 minute ridges. Saffron yellow, stained in the -middle with light 

 purple. Ligament horny, tessellated. A species most peculiar in 

 color, and not less in sculpture ; the surface of the central areas hav- 

 ing the appearance of coarse cloth or canvas. (Eve.) 



Habitat f (Rve.); (New Zealand (Greenwood, et al.} 



C. crocinus Rv., Conch. Icon., t. 22, f. 146, 1847. Lepidopleurus 

 empleurus HUTT., Tr. N. Z. Inst. iv, p. 178 ; Man. N. Z. Moll. p. 

 113, 1880, teste Hutton in private letter. 



This, if really from New Zealand, is probably distinct from C. 

 platessa Gld. ; but Dr. Carpenter believed them to be identical. 



C. SANGUINEUS Desliayes. PI. 10, fig. 27, 28. 



Shell small, regularly ovate, much depressed, equally obtuse at 

 the two ends ; blood red all over ; end valves semi-lunar ; inter- 

 mediate valves narrow, tripartite, most minutely granulated when 

 viewed under a lens. Marginal girdle narrow, clothed with small 

 scales, regularly articulated with brown spots. 



Length 8, breadth 5, height 1 mill. (Desk.) 



Islands of Reunion and Mauritius. 



