CEBASTFS. KACHISELLTJS. 271 



from the type of distans. They range in size from 19x10 to 

 18-5x9 mm. Pfeiffer in describing Bulimus distans alluded to 

 the fact that it differed from B. abyssinicus in its more elongated 

 spire and the sculpture. 



Fig. 101. Cerastus distans. Shell -|, sculpture . 



As neither C. distans nor C. charbonnieri has been illustrated 

 before, I add figures of the two from the types in the Cuming 

 collection, with an enlarged view of the sculpture of the former. 



Var. charboimieri, Pfeiffer. 



Bulimus charbonnieri, Pfeiffer, P. Z. S. 1856, p 331 : ibid., Mon. 

 Helic. Viv. iv, 1859, p. 410. 



Fig. 102. Cerastus charbonnieri. f. 



Genus RACHISELLUS, Bourguiynat. 



Rachisellus, Bourguignat, Moll. Afr. Equat. 1889, p. 68; Thiele, 



Wiss. Ergebn. Deuts. Zentr.-Afr. Exp. iii, Zool. 1911, p. 201. 

 Rhachisellus, Connolly, Ann. S. Afr. Mus. xi, 1912, p. 164. 



TYPE, Bulimus punctatus, Anton. 



Range. India, Tropical Africa. 



Shell elongate-oblong, last whorl shorter than the spire, 

 attenuated at the base ; umbilical perforation open and deep, 

 more or less covered by the much reflexed columellar margin, the 

 base of the last whorl subangulated around the umbilicus. Upper, 

 outer, and basal margins of peristome straight, acute, not thickened 

 or reflected. 



