anterior \alvr not rorn^|.ondin_r t< i-xtrrnsil rilis. Posterior 

 luiriii'i the vnici". }n>*teri'n-. Suitttal plafat fn-nml/i/ imitxl across the 

 sinus. < iinllr thick, lent licry, with minute Imm'hes of delicate sjnne- 

 lets scattered upon it. 



The position assigned by Shuttleworth to the type of this genus 

 was not. tar from correct. The Ischnoid insertion-plates, solid eaves 

 and the leathery spiculose girdle are characters strongly binding C. 

 <ji<i<i.< to ( '/nrfttjtlfura. Upon parting the valves, however, we notice 

 that the macro in C. gigas is situated toward the rear, and the [in- 

 terior teeth are thereby thrown forward, as in Pallochiton ; the 

 sutural plates are united by a brown "keystone" filling the sinus 

 somewhat as in Endoxochiton (p. 192) ; and the spicules of the girdle 

 are gathered into little bunches different from any other Chiton. 

 The valves, too, are remarkably solid. This combination of char- 

 acters seems sufficient for the establishment of the genus Dinoplax, 

 the position of which I take to be near Pallochiton. 



D. GIGAS Gmelin. PI. 57, figs. 21-32. 



Shell oval, large, ponderous and strong, elevated, obtusely angled. 

 Surface lusterless, eroded, ash-white in color with some brown 

 smears, when adult; the young being prettily streaked or mottled 

 with chestnut and bluish on a light ground. 



Median valves not beaked ; lateral areas very much elevated, 

 radially striated in young shells and upon the outer edges of adults ; 

 central areas closely and finely foveolate in the young, and on the 

 protected front edge of adult valves. Anterior valve elevated, its 

 surface similar to the lateral areas. Posterior valve depressed but 

 roof-shaped, the mucro posterior, the slope behind it nearly vertical. 



Interior whitish, flesh-colored on the sutural plates and marked 

 with brown at their bases; having two broad chestnut rays behind. 

 Sutural plates wide, connected across the sinu* by a broad key-stone 

 shaped lamina. Anterior valve having 8-10, central valves 1, pos- 

 terior valve 8-10 slits ; teeth acute, smooth, those of the posterior 

 valve rather stumpy, wedge-shaped, directed forward. Eaves solid. 



Girdle fleshy, strong, blackish, beset with numerous tiny bunches 

 of minute spinelets (fig. 31.) 



Length 70, breadth 45 mill. 



Length 100, breadth 56 mill. 



South Africa, at Table Bay, Natal, Port Elizabeth and Algoa Bay. 



Chiton tnaj-imu* a Promontorio Bomc Spei CHKMNITZ, Von einem 

 Geschlechte vielschalichter Conchylien mit sichtbaren Geleuken, 



