176 HELIX-HELICELLA. 



H. mesostena WESTERL., in West, and Blanc, Aperyu Faune 

 Grece, p. 71, t. 3, f. 23 (1879) ; Fauna Pal. Binnenconch., p. 235. 

 MARTENS, Archiv f. Naturg. 1889, p. 187, t. 10, f. 10. 



Distinguished by its closely crowded whorls, rather flat base, dark, 

 irregular flecking, narrow umbilicus and generally deeply descend- 

 ing whorl at the aperture. 



The specimens from Kalathines are proportionately high, alt. 5, 

 diara. 6* mill. 



H. CESPITOIDES Fischer (Vol. Ill, p. 56). PI. 42, figs. 29, 30. 



According to Crosse (Journ. de Conch. 1887, p. 211) this shell 

 which has been referred to Pat. cooperi W. G. B. as a synonym, is a 

 form of the Mediterranean basin. The original figures are copied 

 on pi. 42, figs. 29, 30. The original description is as follows : Shell 

 orbiculate-depressed, rather solid, umbilicated, longitudinally irregu- 

 larly striated; whorls 6, moderately increasing; brown-viola- 

 ceous and ornamented with obscure zones ; rotund-globulose ; suture 

 impressed, white ; last whorl rotund. Aperture obovate, transverse ; 

 peristome simple, slightly deflexed above, sub-thickened with white 

 inside ; columella not callous. 



Alt. 12, greater diam. 22, lesser 19 mill. 



Differs from H. cespitum in the darker coloration, more globulose, 

 less flattened whorls, etc. 



( Oriental species.} 

 H. BEADLEI Pilsbry; n. sp. PI. 46, figs. 49, 50, 51. 



Shell globose-conoidal or trochoidal, narrowly umbilicated, the 

 umbilicus about one-twentieth the diameter of the shell; solid, 

 opaque, white, variously banded with purple-brown. Surface some- 

 what shining, rather strongly striated, the striation subregular on the 

 spire, irregular on the body-whorl. 



Spire conoidal, apex subacute ; earliest 1 * whorls minute, polished, 

 white, forming an unsculptured nuclear shell of H-l* mill, diameter. 

 Whorls 6*, slowly increasing, the inner ones somewhat speckled with 

 translucent, then becoming banded, the latter half of the last whorl 

 very gradually descending ; periphery rounded. Aperture rotund- 

 lunar, its length and breadth equal ; peristome thin, not thickened 

 within except slightly at baso-columellar margin. 



Alt. 18, diam. 20* mill. 



Alt. 18, diam. 19 mill. 



Alt. 14, diam. 17* mill, (not adult.) 



Desert of Arabia. 



