138 ISCHNOCHITON. 



sharp ; mucro not much raised, situated at the front fourth, posterior 

 slope a little concave. Valves square, not beaked ; glossy, with very- 

 fine quincuncial granulation. Inside : posterior valves having 10 or 

 11, central valves 1, anterior valves 11 slits; teeth sharp, thin, and 

 rather long; sinus broad, deep, flat, not channelled at the sides . 

 eaves projecting, granulated in quincunx but not spongy. Girdle 

 with rather large, stout, smooth roundish scales. (Cpr., from 

 types). Length 13?, breadth 8 mill. ; divergence 120. 



Port Jackson, New South Wales, Australia. 



Lophyrus smaragdinus ANGAS, P. Z. S. 1867, p. 115, t. 13, f. 28 ; 

 t. c., p. 222. Lepidopleurus smaragdinus CPR., MS. 



I. SULCATUS Quoy & Gaimard. PI. 38, figs. 24, 25, 26. 



Shell oval-oblong, quite convex, obtusely triangular, with narrow 

 girdle ornamented with little, rounded scales, each of which is green, 

 ish with a brown dot. The valves are wide, arcuate, almost without 

 carina, very prettily grooved lengthwise on the sides, and zigzag 

 in the middle. The lateral areas are triangular, granulose, and 

 elevated. The anterior valve is simply granulated, with 11 or 12 

 teeth; the posterior valve is larger with 13 teeth, and above it is 

 striated in front, and with marginal granulations. The sutural- 

 plates are short and separated. All of these parts are of a hand- 

 some clear green varied with white. The base of each of the lateral 

 triangles is white. Each valve has at the summit a green spot 

 surrounded with whitish, or sometimes with rose, in which case the 

 interior also is roseate. Length 30, width 18 mill. 



Port of King George, S. Australia. 



C. sulcatus Q. & G. Voy. Astrol. iii, p. 385, t. 75, f. 31-36. (Not 

 Chiton (Radsia) sulcatus Wood.) 



The generic position of this species cannot be known until the 

 characters of the insertion-plates are more exactly described. The 

 above description is from Quoy, who remarks that the species has 

 considerable resemblance to C. viridis Q, & G. (C. quoyi Dh.), 

 differing in the sculpturing of the valves, especially the end valves. 



I. TESSELLATUS Quoy & Gaimard. PI. 24, figs. 13, 14, 15. 



A small oval species, nearly flat, having a rounded carina. Gray- 

 ish all over, but under a lens showing white and brown elongated 

 spots. The valves are very finely granulous, the lateral areas 

 sulcated radially. The two end valves have smooth teeth, 12 in 

 the head valve, and more on the last valve. The girdle is scaly, 



