rSCHNCX HITOB fSCHlfOB LDtt \. 



?///// y/'/irr /nni/ifinlinu/ r/A/r/x, ;>}>-<. Ictc n t! 

 win -iv they _irivc place to a d-n.-r microscopic Lrran illation. 

 apices of the valvc^ arc pink in mature >he!U. Knd valves sculpt- 

 ured with clo>r radiating ril.lets, those of the posterior valve irreg- 

 ularly ^ranose; IIUHTO rather depres.-ed ; posterior slopes of th- 

 valve depressed and concave. 



Interior liirht blue-green, with two wide pink rays in each v 

 and behind them two olive-brown rays. Sntural plates nun 

 whitish or yellowish; sinus wide, flat, not in the least toothed. 

 Insertion plates having 16-21 slits in the anterior, 2 or 3 in the 

 median, and 17-21 in the posterior valve; teeth rather thick and 

 stumpy, and a, little rugose, but sharp edged. Eaves wide and solid. 

 Girdle (fig. 57) wide, closely covered with conspicuous, convex, 

 pebble-like scales, which toward the outer edge are subcatinated in 

 the middle. 



Length 62, breadth 35 mill. 



Port Jackson, Australia. 



Chiton australis SOWERBY, Mag. of Nat. Hist. (Charlesworth's), 

 June, 1840, p. 290 ; Conch. Icon., f.46. REEVE, Conch. Icon., t. 2, 

 f. lO.Lophyrus australis ANGAS, P. Z. S. 1867, p. 221. Lepido- 

 radsia australis CPR., MS. and DALL, Proc. U. S. Nat. Mus. 1878, 

 p. 279, t. 2, f. 19 (dentition) ; p. 333 (branchia>). HADDON, 

 ' Challenger ' Rep., Polyplac., p. 1 9. Chiton (Ischnoradsia) australis 

 SHUTTLW., Bern. Mittheil., 1853, p. 66. C. evanidus SOWERBY, 

 Mag. Nat. Hist, iv, June, 1840, p. 291 ; Conch. Illustr., f. 139. C. 

 metallicus RVE., Conch. Icon., t. 17, f. 104, 1847. 



This species is distinguished from the following by the fine longitu- 

 dinal ribbing of the central areas. The synonymy given above is 

 unquestionable. 



Occasionally one or more of the teeth is cloven into a number of 

 small ones ; the number of teeth varies considerable. 



Dall found the gill rows to extend the whole length of the foot, 

 and to contain forty-seven branchiae in each. Mantle-edge plain, 

 thin ; muzzle plain, semicircular, without a veil. 



I. NOV.EHOLLANDI.E (Gray) Reeve. PI. 19, figs. 67, 68, 69. 



Shell oval-oblong, elevated, the dorsal ridge an.L r ul:< opes 



nearly straight. Color green, minutely marbled with olive, the 

 lateral areas darker. 

 10 



