184 HELIX-TURRICULA. 



the base, and frequently the upper surface is suffused with brownish. 

 Surface coarsely sculptured with rude, irregular, oblique white riblets, 

 which distinctly crenulate the peripheral keel, and are much finer on 

 the base. 



Spire low-conic, apex light corneous, polished. Whorls 4 J, slightly 

 convex, slowly widening, the last strongly carinated at the periphery. 

 Aperture oblique, transversely oval, somewhat lunate, peristome 

 thin, not lipped within, the outer margin not angled at the position 

 of the keel in adults. 



Alt. 4-4i diam. 7-8 mill. 



Berrouaghia, Algeria. 



H. barneyana Anc., WESTERL. Bull. Soc. Mai. Fr. 1888, p. 61. 



A smaller species than H. ponsonbyi Kob., and much more 

 strongly ribbed above. The specimens illustrated and described 

 were sent by K. Jetschin. Specimens of the same species are before 

 me, bearing Ancey's label " H. Theodori Ancey," and from the same 

 locality. I have not seen this name in print and suppose it to be 

 unpublished. There can be no doubt of the identity of the specimens 

 with barneyana. 



Section TURRICULA Beck. 



H. TUBERCULOSA Conrad. (Vol. IV, p. 25). PI. 27, figs. 67, 68, 



69, 70. 



Additional figures of this species are here given for comparison 

 with the following forms. It is likely that crenulata Oliv. and tuber- 

 culosa are synonymous names, but the former was not sufficiently 

 well figured by Olivier to decide with certainty. If. tuberculosa 

 may be distinguished from H. ptychodia, H. philammia and H. bere- 

 nice by the invariable presence of a series of tubercles on the upper 

 surface of the whorl, midway between sutures, or suture and 

 periphery. 



H. PTYCHODIA Bourg. (Vol. IV, p. 25). PL 27, figs. 71, 72, 73, 



74. 



Better illustrations are here given, the figures representing spec- 

 imens collected by G. Schweinfurth in 1885, at Gebel Gharebun, 

 (between Cairo and the upper end of the Red Sea). Bourguignat's 

 locality was the Isthmus of Suez. The ptychodia differs from H. 

 philammia in (1) the greater width of the umbilicus at every stage 

 of growth, (2) the more projecting, smooth, convex first whorl, (3) 



