80 HELIX-ACAVUS. 



colored, the terminations joined by a shining, entering, blackish- 

 chestnut callous ; superior margin slightly arched, expanded and a 

 little reflexed, columella sloping, flat, much dilated, adnate. (Pfr.) 



Alt. 27, greater diam. 38, lesser 30 mill. 



Ceylon. 



H.fastosa ALBERS, Mai. Bl. i, 1854, p. 213. PFR. Novit. Conch, 

 i, p. 40, t. 11, f. 1, 2; Monographia iv, p. 197. HANLEY & 

 THEOBALD, Conch. Indica, t. 127, f. 5. 



Pfeiffer notes a variety which is white, peristome very pale rose, 

 parietal callus purple. 



I have not seen this species. It seems nearest to H. hcemastoma, 

 but differs in having many encircling bands, etc. 



H. PROSPERA Albers. PL 17, figs. 14, 15. 



Shell imperforate, conoid-globose, solid, distinctly striate, unicol- 

 ored, purplish-chestnut ; spire inflated-conoidal, apex rosy ; whorls 

 4, convex, moderately increasing, the last ventricose, subdescending 

 in front ; aperture diagonal, truncate-oblong, rounded below, milk- 

 white inside ; peristome purple, expanded, its terminations joined by 

 a purple callus, right margin a little bent in the middle, upper mar- 

 gin arcuate, columellar margin straightened, dilated, a little exca- 

 vated, passing gradually into the basal margin. (Pfr. from speci- 

 men in coll. Albers.) 



Alt. 25, greater diam. 44, lesser 34 mill. 



Ceylon. 



H. prospera ALB. in Malak. BL 1857, p. 93, t. 1, f. 7, 8. PFR. 

 Monographia iv, p. 197. 



Differs from all other species in its globose form, etc. I have not 

 seen specimens. 



H. PHCENIX Pfeiffer. PL 17, figs. 10, 11, 12. 



Shell globose-conoidal, dull chestnut colored, or when rubbed yel- 

 lowish or pink with wide indistinct light brown or pink oblique 

 streaks ; never distinctly spirally banded ; lip black (rarely brown 

 or pink) ; columella a little truncated at its lower end or not per- 

 ceptibly so. 



The shell is globose conoidal, rounded at the periphery ; solid ; 

 last whorl reddish-brown, upper whorls yellowish or pink ; but when 

 worn or rubbed the body-whorl is light with oblique streaks of 

 yellowish-brown or pink. The surface is lusterless, rather rudely 

 striate, and shows under a strong lens a very faint, very minute pat- 



