African Non-marine Mollusca. 351 



acute ; coliimcll;i erect, very slijjjlilly tortiiate, marfyju nar- 

 rowly triangularly refiexed, uearly covering the very small 

 umbilicus. 



Long. 10"9, lat. 4<'8; apert., alt. 4*5, lat. 2'2 ; last wliorl 

 65 mm. 



Hub. Kenya, Taru Desert (Perclval). 



A still more ordinary little shelly rather weatlier-worn and 

 probably somewhat immature, but in no way recognisable as 

 the young of any of the larger species of the boivini group. 

 Ps. margueritce (Preston), from a somewhat adjacent localty, 

 has a relatively shorter aperture and appears to be an alto- 

 gether smaller species, while the striie on its 2nd whorl are 

 closer together and do not show such a marked difference in 

 distance between them and those on the third ; the umbilicus, 

 too, in margueritce is considerably less hidden than in 

 ingloria. Except for these differences, which may not, 

 perhaps, prove to be constant, the latter might well be 

 considered a more adult example of the former. 



Pseudoglessula terrulenta (Morelet), 1883. 



Originally described fiom Gaboon as a BuUmus, and 

 tentatively placed by Pilsbry (1906) in Cw?T£?//«j this species, 

 whose type is in the British Museum, is a small Pseudo- 

 glessula^ so near akin to the better-known P. stuhlmanni 

 (Mts.) that the two may eventually prove to be conspecific. 

 P. terrulenta may now be recorded from Bitze, Camerun 

 (Bates), whence it has been rather widely distributed by 

 Preston as a Cerasius, bearing the name of the province last 

 mentioned ; this, however, has never been published, and 

 need not be introduced into literature. 



Genus HoMORus, Albers, 1850. 



Homonis burnessi, sp. n. (PL 1. fig. 1.) 



Shell large, elongate-turriform, imperforate, comparatively 

 thin, smooth, shining, nearly transparent, pale yellowish 

 corneous. Spire much produced, sides regular except for 

 slight attenuation at the 5th whorl, apex narrowly conoid. 

 Whorls 11, flattisli, gradually increasing, sculpture limited 

 to very faint, flat, fairly regular, nearly straight, slightly 

 oblique transverse striie; suture simple, rather oblique. 

 Aperture acuminate-ovate, peristome simple, acute, outer lip 

 moderately curved outward, nearly straight and not receding 

 much to the base in profile ; columella concave, rectangularly 

 truncate at base. 



