

HELIX-IB ERUS. 235 





branching ; and under a strong lens the whole surface is seen to be 

 densely spirally striated. 



Spire low-conic, apex obtuse. Earlier li whorls horny, subcon- 

 vex; lacking wrinkles, and forming a comparatively large nuclear 

 shell, about 4 mill. diam. Following whorls wrinkled, rather 

 rapidly widening, flat ; the last having a strongly compressed periph- 

 eral carina, swollen below, deeply descending in front. Aperture 

 very oblique, ovate-rhombic, its contour hardly interrupted by the 

 parietal wall; lip thin, expanded, continued in a free lamella across 

 the parietal wall. Alt. 10, diam. 22 mill. 



Angera (Andjera) Mis. northern Morocco. 



H. viola PONS., in KOB., Nachrichtsbl. D. M. Ges. xxi, p. 12, 

 1889; Rossm. Icon. n. f. iv, p. 74, f. 648. 



This species belongs to a small African group which comprises H. 

 sultana, H. culminicola and H. viola. It is distinguished from the 

 former two by the wider umbilicus, slightly elevated parietal wall 

 of the aperture, and especially by the much larger size of the 

 embryonal shell, the junction of which with the after-growth is 

 marked in all these forms by a rather sudden but irregular widening 

 of the whorl. My description is from specimens received from 

 Ponsonby. 



H. QUEDENFELDTI v. Martens. PI. 34, figs. 67-71. 



Shell covered imperforate, carinated, globose-lens-shaped, solid 

 but not thick, sculptured with oblique close riblets parallel with the 

 aperture, which disappear toward the umbilicus; grayish-brown 

 having five interrupted subobsolete brown bands ; spire roof-shaped, 

 apex rather large, smooth. Whorls 4, rapidly increasing, the first 

 smooth, convex, the following flattened, encircled by a thick, more 

 or less prominent keel ; last whorl large, angulate, inflated below, 

 abruptly deeply deflected in front ; the carina disappearing on the 

 latter part of the body-whorl. Aperture very oblique, subcircular, 

 little lunate ; peristome shortly expanded, whitish ; margins much 

 converging, joined by a distinct callus; the upper and outer equally 

 arched ; basal dilated, appressed. (Kob.~) 



Alt. 10, greater diam. 17, lesser 14 mill. 



Misselata, Tripoli. 



H. quedenfeldti MTS., Sitzungsber. Ges. Naturf. Freunde zu Berlin 

 1890, p. 79. KOBELT, Nachr.-Bl. D. M. Ges. 1890, p. 213 ; Rossm. 

 Icon, v, p. 76, f. 881, 882 ; Nachr.-Bl. 1891, p. 140. 



