ENDODONTA. 31 



Subgenus PARATROCHUS Pilsbry, 1893. 



Paratrochas PILS., Manual viii, p. 295. 



Shell high-conic, having numerous (8>j) whorls; narrowly unibil- 

 icated and well sculptured. Aperture nearly round, the peristome 

 continued in a thin callus across the parietal wall. Type H. dalber- 

 tisi Braz., pi. 6, figs. 55, 56. 



Soft parts unknown. The single species is from Yule Island, 

 British New Guinea. 



E. dalbertisi Brazier, viii, 295. 



Subgenus CHAROPA Albers, 1800. 



Shell depressed, umbilicated, discoidal or subdiscoidal. Aperture 

 toothless ; lip thin and simple. 



This subgenus differs from Nesophila in entirely lacking spirally 

 entering line upon the parietal wall. It is likely that some of the 

 species included herein have descended from toothed forms ; although 

 the toothless Charopas are doubtless nearer than the toothed types 

 to the ancestral form of the genus Endodonta. 



Sections of Charopa. 



a. Shell ribbed or rib-striate, Patuloid ; whorls rounded, 



Charojm s. s. 

 aa. Shell often hairy or shaggy; whorls keeled, 



Acanthoptyx, Tropidotropis, Pterotropis. 



Section Charopa Albers, s. sir. 



Charopa ALB., Die Hel. (edit. 2), p. 87, type H. coma Gray. 

 ANCEY, Bull. Soc. Mai. Fr. v, p. 364. PILSBRY, Manual viii, p. 96. 

 HEDLEY, Proc Linn. Soc. N. S. Wales (2) vii, p. 157. Simj^lic- 

 aria Mouss. MS., Suter, Tr. K. Z. Inst. xxiii, p. 90. 



Shell depressed, subdiscoidal, the spire varying from convex to 

 concave ; openly umbilicated ; whorls rather cylindrical, the last 

 rounded or subangular (never keeled) at the periphery. Surface 

 sculptured with oblique or sigmoid rib-striae; unicolored or painted 

 with radiating reddish flames. Aperture lunate, oblique, the lip 

 thin and simple, more or less sinuous ; parietal wall covered by a 

 varnish of callus, the riblets being removed by absorption. Type 

 E. coma Gray, pi. 6, figs. 57, 58, 59 (pi. 6, figs. 63, 64, 65, E. tapir- 

 wa.) 



