HELIX. 11 



H. B^TICA, Rossmassler. PI. 2, figs. 36, 37. 



Globose, solid, whitish ash-color; whorls 5^, very slowly in- 

 creasing, the upper ones carious-rugulose, the penultimate about 

 as broad as the last, the last more or less angulated on the 

 periphery, rounded in front; aperture widely lunar, angulated 

 exteriorly, peristome internally sublabiate. Diam. 25 mill. 



Spain, Morocco, Algiers. 

 Var. ALEXANDRINA, Fagot. 



Smaller, conical bullet-shaped, penultimate whorl viewed from 

 above appearing broader than the last one. Diam. 14-15 mill. 



Near Alexandria, Egypt. 

 H. THAYACA, Bourg. PI. 2, fig. 38. 



Imperforate, opaque, solid, finely striated, brownish oliva- 

 ceous ; whorls 6, periphery obtusely angulated. Diam. 27 mill. 



Constantine, Algiers. 

 H. TITANODOLEMA, Pechaud. 



An unfigured species from the same locality as the above, but 

 white, the whorls more drawn out, the base more swollen, the 

 last whorl suddenly deflected anteriorly. 



H. OTTHIANA, Forbes. PI. 2, figs. 39-44. 



Umbilicated, carinate, striate, white, suture subcrenulated ; 

 whorls 5, planulate, the last scarcely deflected in front. 



Diam. 23 mill. 



Algiers. 

 Yar. JEANNOTIANA, Terver. Figs. 41, 42. 



More depressed and smaller, umbilicus open, periphery sharply 

 carinated. 



H.piestius. Bourg., is a synonym. 



Yar. CHIONODISCUS, Pfr. Figs. 43, 44. 



Umbilicus nearly covered, con vexly depressed above, periphery 

 with a strong wavy carina, becoming obsolete towards the aper- 

 ture ; whorls 5, the last abruptly deflected in front. 



Diam. 26 mill. 



Bourguignat has distinguished two forms of this Yar. under 

 the names of oxygira and depressa. 



Yar. SPEIRONOMALA, Bourg. 



Larger, much more compressed and sharply keeled, the umbil- 

 icus open and rather broad, lip drawn down or overhanging 

 above. 



