132 ISCHNOCHITON. 



Hakodadi, Japan (Stimpson, N. P. E. E. Smithsonian Mus., No. 

 1672.) 



Chiton puleherrimus (pars) GLD., MS., not SOWB. Leptochiton 

 craticulatus GLD., pars, Otia, p. 117. (Cpr.) 



This species differs from I. puleherrimus Sowerby in having five 

 rows of extremely fine, distant, but strongly expressed granules, 

 instead of three (rarely four) of very coarse ones. This has the 

 space between the very sharp, knife-like central ridges but faintly 

 cancellated with rugose lines ; while in puleherrimus the cancella- 

 tion is so strong as to make the ridges appear granular. But the 

 principal distinction is that puleherrimus has strong strise on the 

 mantle- scales, while those of cultratus are smooth and larger in 

 proportion. It has the same general aspect as /. craticulatus ; but 

 differs in having the central ridges further apart and sharper ; the 

 side rows of points scarcely half as numerous, and the scales much 

 larger and more regular. (Cpr., MS.) 



I. MUSCARIUS Reeve. PI. 24, figs. 9, 10. 



Shell oval, jugum rather sharp, mucro at the anterior third, 

 rather raised, the slope behind it very concave. Color a peculiar 

 ash, with irregular brown spots over the central areas, and brown 

 crescentic lines over the lateral areas ; and valves with spots of 

 dark shaded with light. The central areas have a conspicuous 

 quincuncial granulation. Lateral areas somewhat raised, with about 

 7 very indistinct small riblets, also quincuncially granulated, and 

 having an appearance of being concentrically sculptured, caused by 

 the color-markings. Interior : posterior valve having 12, central 1, 

 anterior valve 12 slits ; teeth very sharp ; eaves moderate, not 

 spongy. Girdle covered with imbricated, smooth, moderately large, 

 stout oval scales. 



Length 18*, breadth 11, divergence 119. (Cpr. from type in 

 B. M.) 



Mazatlan. 



Chiton muscarius REEVE, Conch. Icon., t. 24, f. 164. Lepido- 

 pleurus muscarius CPR., MS., p. 120. Lepidopleurus f macandrei 

 CPR., Mazat. Catal., p. 196. Ischnochiton macandrece CPR., MS., 

 p. 88. 



Carpenter seems to have decided that the L. macandrei of his 

 Mazatlan Catalogue was identical with Reeve's C. muscarius, 

 although he remarks that he would not have known it from the 



