136 i- IIN<>< HITON*. 



usually with three main radiating low ridges, the anterior and pos- 

 r of which are often bifid. Posterior valve concentrically 

 rugose, with fifteen irregularly arranged low radiating ridges. The 

 anterior ridge is broader than the others, and may be slightly bifid, 

 umbo rudimentary; anterior border smooth, with slight concentric 

 lines of growth. Lamina- of insertion moderate in size. 



Girdle narrow. Upper surface with ovoid, slightly overlapping, 

 somewhat granular scales; edge with minute projecting spicules; 

 under surface, with long, narrow, closely applied scales. Color 

 white. 



Length 21'5, breadth 7'f>, height 6 mill. (Haddon.') 



Prince Edward's Island, Lat. 46 41' S., long. 38 10' W. 310 

 fros. 



Lepidopleurut dorsuosus HADDON, Challenger Polyplac., p. 1 

 1 , f. 5 ; t. 3, f. 5o-5t. 1886. 



Gills extending to more than half the length of the foot, twenty in 

 number, the middle somewhat larger than the remainder. The 

 name dorsuosus, full of ridges, is applicable to this species on 

 account of its numerous longitudinal and radiating ridges, and at the 

 same time recalling the steep ridge of the shell itself. (Haddon.) 



I . \hii\ IDENSIS Reeve. PL 24, figs. 7, 8 (enlarged.) 



Shell somewhat shortly ovate, very minutely reticulated through- 

 out, under the lens; terminal valves and lateral areas of the rest 

 finely ridged, ridges waved, central areas smooth, lateral areas not 

 raised ; livid olive and yellow, flamed with brown in the middle, 

 posterior edges of the valves articulated with brown ; ligament 

 L r nmately coriaceous, grains very large. (7?ve.) 



I '<>rt Adelaide (Rve.) ; Port Molle, Queensland (Coppinger), Aus- 

 tralia. 



Chiton adelaidensis REEVE, Conch. Icon., 1. 19, f. 123. C. (Isch- 

 'itonf) adelaidensis E. A. SMITH, Zool. II. M. S. 'Alert/ p. 

 79, 1884. Lepidopleurus adelaidensis CPR., MS. 



Smith L'ives the followini: notes on the specimens collected at 

 Port Molle by Coppinger: 



The entire surface of this species is minutely i:ranosely reticulated. 

 the front valve, the lateral areas of the narrow central valves, and 

 the hinder area of thepo.-terior are in addition somewhat irregularly 

 radiately sulcate. The prevailing color is pale greenish, streaked 

 and dotted with ivd, the posterior mar-in of the valves brinLT paler 



