116 POLYPLACOPHORA. 



with brown zones above, greenish beneath. (Blainv., Diet. Sc. Nat. 

 xxxvi, p. 545). 



Habitat unknown. 



This species is placed in the same section as the Acanthopleuras 

 (granulata, picea, etc.) by Blainville. 



CHITON RARIPILOSUS Blainville. Body oval, thick, convex, not 

 carinated ; girdle moderate, beset with large black flexible hairs, a 

 little more numerous around the periphery. Shell of 8 thick valves, 

 a little carinated ; the two end valves a little smaller, the anterior 

 semicircular, with 9 large teeth of insertion, the posterior transversely 

 oval, with the insertion plate entire, winged anteriorly ; intermediate 

 valves alike, having a rounded projection in the middle of the ante- 

 rior border ; the plate of insertion somewhat winged, with a single 

 deep slit on each side. Color brown on the girdle, the valves russet 

 white outside and within. Length more than 3 inches. (Blainv., 

 Diet. Sc. Nat. xxxvi, p. 547). 



Habitat unknown (coll. Blainv., from Dr. Leach). 



Seems to be a Plaxiphora. Rochebrune has identified it with 

 Chiton setiger King (Polyplac. Cap Horn, 1889). 



CHITON MACULATUS Gmel., Syst. Nat. xiii, p. 3205. Wood, Gen. 

 Conch., p. 11. This is perhaps C. tulipa Quoy, but its identity is 

 uncertain. 



CHITON INDUS Gmel. Syst. Nat. xiii, p. 3205. Wood, Gen. Conch, 

 p. 15 (=Chiton indicus Chem., Conch. Cab. viii, p. 287, t. 96, f. 811). 

 Add to doubtful synonyms of C. squamosus Linn. 



CHITON BICOLOR Gmel., Syst. Nat. xiii, p. 3204. Wood, Gen; 

 Conch., p. 17. This is apparently a well characterized species, but 

 I do not know of any to which it may be with confidence referred. 

 The figures of Chemnitz (Conch. Cab. viii, p. 277, pi. 94, f. 794, 

 795) by which alone it is known, resemble such a shell as Tonicia 

 chilcensis, figured on pi. 42, fig. 40, of vol. XIV. 



CHITON CERASINUS Chemnitz, Conch. Cab. viii, p. 278, t. 94, f. 

 796 and of GMELIN, Syst. Nat. xiii, p. 3204, is probably a synonym 

 of C. castaneus Wood. The dried animal is said to Ibe black. Hab- 

 itat unknown. 



CHITON THALASSINUS Gmel., Syst. Nat. xiii, p. 3206. Wood, 

 Gen. Conch, p. 24 (Schroter, Neue Litterat. iv, p. 4, t. 1, f. 1) is a 

 wholly unidentifiable small 6-valved species, from the West Indies. 



