British and German East Africa , &c. 531 



impressed, faintly margined below; perforation very small; 

 columella slightly curved and reflexed ; labruin simple, 

 arcuate ; aperture sublimate. 



Alt. 3*5, diam. maj. 7, diam. min. 6 mm. 



Aperture : alt. 3, diam. 3*75 mm. 



Hab. Shimbi Hills, British East Africa. 



Thapsia insulsa, sp. n. (Fig. 14.) 



Shell differing from T. exasperata in its much smaller size 

 and more compact coiling, though having the same number of 

 whorls, rather less depressed spire, and proportionately wider 

 perforation, which in the present species, notwithstanding its 

 much smaller dimensions, is o£ about the same diameter as 

 T. exasj>erata. 



Alt. 1*5, diam. maj. 3 25, diam. min. 275 mm. 



Hab. Shimbi Hills, British East Africa. 



Phorlion ariel, sp. n. (Fig. 15.) 



Shell small, globosely turbinate, thin, horny, pale brown ; 

 whorls 5, rather flat, sculptured with very fine and closely 

 set, silky, transverse and minute, spiral stride; sutures im- 

 pressed ; base of shell inflated; columella reflexed, vertically 

 descending and forming an obtuse angle with the labium 

 which is acute and arcuate ; aperture sublunate. 



Alt. 4, diam. maj. 3"5 mm. 



Aperture : alt. 1*75, diam. 1*5 mm. 



Hab. Shimbi Hills, British East Africa. 



The name Phasis being preoccupied in another branch of 

 Zoology it becomes necessary to substitute a new name for 

 the molluscan genus until now bearing this appellation, of 

 which the type species is P. menkeana, Pfr., from the Cape 

 of Good Hope ; I therefore propose the name Phortion for 

 this group. 



Rachis hieroglyphicus, sp. n. (Fig. 16.) 



Shell turbinately ovate, extreme apex black, the remainder 

 of the shell whitish, painted on the upper whorls with two 

 spiral rows of squarish, dark chestnut blotches, between which 

 occurs a narrow, indistinct, interrupted band of a paler colour, 

 the last whorl ornamented with numerous narrow bands of 

 chestnut and black, the upper of these being much interrupted, 

 the lower ones less so until the last which is continuous, the 

 spaces between the last three being occupied with black 

 transverse flame-markings and streaks which, together with 

 the spiral bands, present the appearance of hieroglyphics, 



