ISCIIN'M || I IMS. 



interstice.- traDSVenely wrinkled. Lateral areas havini: d< 

 elevated Lrraniferotis rihlets, 1 in ymni.Lr, * I" H> in adult individ 

 anterior valve having about ~ti} .-uch riblet-. Int. i '-rior 



valve bavin-: I 1 , central valves 1, anterior valve 1 slits ; teeth 

 short, not very acute, outside and at tin- margins in (rout rugulose, 

 almost pectinated in front. Kav> -mall, obi < |Q| short, 



narrow, slightly denticulate. ( lirdle irregularly, closely imbricated 

 with small, smooth, solid scales. 



Length 1T>, breadth 1 -~> mill.; divergence 93. (Cpr.) 

 China Nn/x, orJii/xni (Stimpson, N. P. E. E. ; 1 specimen in Mus. 

 Smithsonian.) 



Chiton (Le]ttochito)i) craticiilatus GOULD, Proc. Bost. Soc. K. II. 

 vii, p. 101, Dec. 1859; Otia Conch., p. 117. Lepidopleurus cratic- 



it tut u* ( 1 I'R., MS. 



Dr. Gould appears from his diagnosis to have had several species 

 under his eye when he wrote the description of this species. From his 

 calling it a Leptockiton, he might have looked at the minute, chaffy 

 scales of Trachydermon asperior ; when he wrote of long striated 

 scales, he was probably observing Ischnochiton bixculptus. Again 

 when he noted the great variation of the ridges (from 4 to 8), he 

 probably had under his eye both /. cultratus and the species above 

 described. Of the four, the balance of characters inclines me to 

 retain the name for the shell last mentioned, although only one - 

 imen was returned of it, mixed with the other three. Outside, the 

 species is recognized by the solid smooth scales, and details of 

 sculpture; inside by the blunt, somewhat rugulose teeth, which < in 

 part of the anterior valve) are almost pectinate. (Q;r.) 

 I. CULTRATUS Carpenter, n. sp. Unfigured. 



Shell similar to " L. craticulatus " ; mucro central, planate, but 

 central areas having about 14 to 20 very acute, strongly developed 

 subparallel lira?, becoming less acute, somewhat obsolete, on the dorsal 

 ridge ; sutures elegantly pectinated, interstices cancellated with small 

 wrinkles; lateral areas having 4 low, gninifurous liruhe, and a 

 fifth line of granules at the sutures, the grains sparse, small, but 

 strongly projecting. Posterior valve having about 18 similar liruhe, 

 anterior valve 24. Interior: posterior valve having i), central 

 valves 1, anterior valve 8 slits; teeth acute : eaves projecting : sinu> 

 small, deep, sensibly laminated, smooth. (lirdlo regularly imbri- 

 cated with flat, smooth scales. (Cpr.) 



.Length 27, breadth 17 mill. 



