GASTEROPODA. 321 
tudinally arcuated lines, like jeweller’s engine-work ; posterior valve 
large, faintly radiated. Margin covered with granules so minute as 
scarcely to be distinguished by the naked eye, chequered green and 
dusky. Inside bluish-green. 
Length seven-eighths of an inch; breadth nine-twentieths of an 
inch. 
Inhabits New South Wales. 
Similar in its general aspect to C. fruticosus, but smaller, smoother, 
and the sculpture of the lateral areas and terminal valves entirely dif- 
ferent. It is almost exactly like fig. 67 of the “Conchological Illus- 
trations,” which is said to be a variety of C. longicymba. In form it 
resembles C. catenulatus, Sowb. 
Figure 431, back of the shell; 431 a, details of the sculpture, mag- 
nified. 
CHITON DENTIENS (Gould). 
Testa minima, ovata, carinata, olivacea, ad dorsum allido fulminata, 
omnino minutissimé granulata; areis vix distinctis ; valvis rostratis 
postice subdenticulatis, dentibus albidis: margo pruinosus. 
Chiton dentiens, Goutp; Proceed. Boston Soc. Nat. Hist., u. 145. 
July 1846. Expedition Shells, 6. 
SHELL minute, ovate, carinate, dark olive, with fine, white, zigzag 
markings along the back, and dotted black and white along the poste- 
rior edge of the valves, the white portions seeming to project like 
minute teeth. The whole surface is minutely granulated, and faintly 
marked by the lines of growth. Lateral areas faintly defined, but 
occasionally marked by a dividing line ; terminal valves like the others. 
Margin clothed with hoary pubescence. 
Length one-fifth of an inch ; breadth three-twentieths of an inch. 
Inhabits Puget Sound, Oregon. 
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