346 



Mr. M. Connolly on 



Pseudoglessula mutabilis, sp. n. 

 (Pi. I. fig. 22 ; text-fig. 1, p. 346.) 



Shell of moderate size, imperforate, turrifoi'm, thin, 

 asperate, translucent, corneous brown. Spire produced, sides 

 regular, extremity of apex involute. Whorls 7, not very 

 convex, gradually increasing, carinate round the base, sculp- 

 tured to the apex with regular, slightly curved and oblique, 

 transverse costulse, which are closer together on the 2nd 

 and 3rd than on the first whorl, and become very gradually 

 wider apart again on the 4 later ones, there being 9 in 

 2 mm. on the face of the last, which is smooth on its base ; 

 between the costulse are some fainter transverse striae and an 

 occasional faint trace of microscopic spiral sculpture ; suture 



Fig. 1. 



Fig. 2. 



Ps. mutahilis. 



Fig. 3. 



Ps. mutandana. 

 Apical structure; X 12. 



Ps. transenna. 



simple, nearly horizontal, well-defined. Aperture quadrate, 

 peristome simple, acute, columella short, rather concave, 

 sharply truncate at base, of paler colour than the rest of the 

 shell. 



Long. 7*9, lat. 2*7 ; apert., alt. 2-1, lat. 1*2 ; last whorl 

 3'7 mm. 



Hab. Kenya, Kekumega (Percival). 



A more slender species than cruda, Pilsbry, and with 

 shorter whorls than lemairei, D. & G., whose first 2 whorls, 

 moreover, must be far smoother than in the new species. It 

 agrees rather closely in form with Pseudoglessula gracilis 

 (Mts.), but is more closely sculptured, especially on the 

 first whorl. 



