214 MR. H. B. PRESTON ON AGNATHOUS 



shell, two elongate lamellse on the outer wall, the upper of which 

 terminates in a coarse, nodulous denticle on the inner margin of 

 the upper portion of the labrum and a broad, bidenticulate 

 projection on the columella. 



Alt. 12, diam. maj. 6'75 mm. 



Aperture : alt. 2-5, diam. 2 mm. 



Hab. Lake Kivu, Belgian Congo {Robin Kemp). 



Ennea pretiosa Preston, var. nyiroensis, var. n. 



Shell differing from the typical form * from Mt. Kenia and the 

 surrounding region in its larger size and more rounded shape ; it 

 also has one whorl more, a shallower suture, and more circular 

 apei-ture ; the last whorl is proportionately narrower towards the 

 base and the transverse costulse in the large series before me are 

 less pronounced. 



Alt. 5-75 (nearly), diam. maj. 3'25 mm. 



Aperture: alt. 1"25, diam. 1*25 mm. 



Hah. Mt. Nyiro, to the south of Lake Rudolph, at an altitude 

 of 8300 feet {A. Blayney Percival). 



Ennea adjacens, sp. n. (PL XXXII. figs. 8, 8 a) 



Shell differing from E. jjretiosa Preston from Mt. Kenia in 

 its broader and more solid form, rather more circular aperture, 

 and in the tra.nsverse sculpture, which, in the present species, is 

 much finer, rather more oblique, and vejy much more closely set 

 except on the latter half of the last whorl; the labrum, which is 

 continuous, is also more broadly outwardly expanded than in 

 E. pretiosa. 



Alt. 5, diam. maj. 3 mm. 



Aperture : alt. "75, diam. "5 mm. 



Hab. Between the Jombene Hills and Nyeri, British East 

 Africa [Robin Kemp). 



Ennea spatium, sp. n, (PL XXXY. figs. 12, 12 a.) 



Shell allied to E. pretiosa, but differing from that species in its 

 much more distant, transverse costulae, which are also much less 

 numerous and placed at about twice the distance apart from 

 one another than is the case with that species. 



Alt. 4'25, diam. maj. 2"75 mm. 



Aperture : alt. '75, diam. "75 mm. 



Hab. Larogi Hills, British East Africa, at an altitude of 

 6000-7000 feet {A. Blayney Percival). 



Ennea mirifica, sp. n. (PL XXXIY. figs. 11, 11 a.) 



Shell allied to E. pretiosa, but considerably broader with 

 whorls angled above, the transverse costulfe are more erect 

 except in the subsutural region and are exaggerated into knife- 



* Ann. Mag. Nat. Hist. 1911, vii. pp. 465-466, pi. xi. fig. 6. 



