The Non-Marine MoUusca of Portuguese East Africa. 129 



it has been collected by C. Harries in the Darugu River valley, Kenya 

 Colony, and is recorded by Germain from the Krebedje District and Tete, 

 in Oubangui. 



Genus Zingis von Martens, 1878. 

 Zingis morrumbalensis (Melv. and Pons.), 1894. 



1894. Nanina morrumbalensis M. and P., A.M.N.H. xiv, p. 90, pi. 1, 

 fig. 1. D.F. 



Hah. Mozambique. Mt. Morrumbala (type, Layard). 



L. Marques. District north of Macequece (Cressy). 



The type is somewhat immature, for the largest of Cressy's specimens 

 measures : diam. maj. 30-3 ; min. 25-2 ; alt. 17-0 mm. 



The shell is remarkable for the sculpture of its apex, which shows low 

 radial folds for the first half whorl and is microscopically spirally striate 

 for about the two succeeding ones, while the post-embryonic whorls are 

 very finely and densely granulate, thus acquiring a dull appearance, which 

 is in great contrast to the glossy apex. 



The foot of the animal has well-marked peripodial grooves, curving 

 upwards at the extremity. The skin over the mantle-cavity, etc. (in a 

 young specimen), is spotted with dark pigment and opaque white patches. 

 The kidney is not quite so long and narrow as in Ledoulxia mozamhicensis, 

 but extends for some distance in front of the pericardium. It forms a 

 yellowish band on the outside, which contrasts with a black band immedi- 

 ately above it, marking the course of the primary ureter. 



The jaw (text-fig. 6, A) is rather thin, with an obtuse median projection, 

 and is about 3-3 mm. in length. It shows numerous extremely fine lines 

 of growth crossed by equally fine radial strife. 



The radula (text-fig. 6, B) measures about 6-2 X 3-1 mm., when flattened 

 out. The central and lateral teeth are tricuspid ; their mesocones project 

 slightly beyond the posterior edges of the basal plates ; the endocones are 

 rather narrow and about half the length of the mesocones, to which they are 

 attached laterally ; the ectocones are shorter but quite separate from the 

 mesocones. The outline of the basal plates is strongly convex on the inner 

 side and concave on the outer. The marginal teeth are more numerous 

 and more closely crowded. They have narrow curved bases, and rather 

 long bifid cusps, composed of a long curved mesocone and a smaller ectocone 

 borne on its outer side. Towards the edges of the radula the teeth diminish 

 in size, the points of the mesocones become rounded, and in a few of the 

 outer marginals the ectocone becomes split into two, or even three, distinct 

 small cusps. The last four or five teeth on each side are quite vestigial, 

 suggesting that this species may have been evolved from one in which the 



