242 LIOLOPHURA. 



Anterior valve having 12 to 15 short, unequal, deeply striated teeth. 

 Posterior valve triangular, flattened, with a callus in place of the 

 insertion-plate. All of the apophyses (which are of a horny color) 

 have a brown spot at the angle. 



Length 19 lines, breadth 1 inch. (Q. & (?.) 



King George Sound, S.- W. Australia (Port du Roi-Georges.) 



Chiton georgianus Q. & G., Voy. de 1'Astrol., Zoologie, iii, p. 379, 

 t. 75, f. 25-30. 



This species is apparently still unknown in English and Amer- 

 ican collections. It seems to resemble closely the L. incana of New 

 South Wales, but differs, if we may trust Quoy's account, in the 

 much shorter girdle appendages, which resemble " rounded tuber- 

 cles " rather than unequal spines. The figure of a detached valve 

 given by Quoy shows a forward wave of the tegmentum at the 

 median sinus, more prominent than in any incaiws before me, which 

 scarcely show such a wave except on the second valve. The median 

 valves of Enoplochiton niger, however, present an exactly similar 

 sinuosity of the margin (compare figs. 24, 25, of pi. 52). The sinus, 

 moreover, appears in Quoy's figures to be bridged by a lamina con- 

 necting the sutural plates, a condition which does not obtain in L. 

 incana. It is possible that the small variety mentioned by Quoy is 

 more closely allied to the incana, or identical with it. 



L. CURTISIANA Smith. PI. 24, fig. 6. 



I am disposed to believe that CHITON CURTISIANUS Smith, which 

 is described on p. 97 and illustrated on pi. 24, fig. 6 (figure enlarged 

 and inverted), is a member of this genus ; but as Smith called it an 

 Ischnochiton, I included it in that genus provisionally. 



L. JAPONICA Lischke. PI. 53, figs. 41, 42, 43, 44. 



Shell oblong, moderately elevated, arched, not carinated. Surface 

 lusterless, generally much eroded and encrusted ; blackish, generally 

 showing a wide light stripe on each side of the black dorsal stripe ; 

 the wide girdle olivaceous, not distinctly barred. 



The median valves are beaked ; lateral areas hardly raised, sculpt- 

 ured with concentric growth-wrinkles and a minute granulation, 

 often lost by erosion. Central areas similarly sculptured. The forward 

 half or two-thirds of the lateral areas and the outer portion of the 

 central areas is black-dotted by the numerous irregularly scattered 

 eyes. Anterior valve sculptured like the lateral areas and closely 

 studded with scattered black dots (eyes). Posterior valve depressed, 



