gibbons: new east AFRICAN LAND SHELLS. 139 



through a small longitudinal slit situated on a slight eminence nearly 

 at the end of the pointed posterior part of the shield; surface rich 

 orange, thickly studded with small oval granules of a rich lemon 

 color; respiratory orifice large, three-fifths length of shield from 

 anterior end; tentacles long and slender, semitransparent, dusky- 

 orange color and with head, very beautifully granulate, granules 

 being small, regular and of a pearly appearance; a slight furrow 

 runs round body about 2 mills, above margin of foot; below this 

 the surface is uncovered by the usual integument, greyish, smooth 

 and secreting mucus very abundantly, at the tail this margin is 

 6 mill, in extent arid bears a small, oval and longitudinal mucus 

 pore, above which the integument forms a slight peak. 

 Length 3 in.; v/hen at rest, about i| in. 



Shell calcareous, unguiform, ovato-oblong, very thin and fragile, 

 above a little convex from side to side, below shallowly concave, 

 sides nearly parallel, anterior edge a little attenuated; behind, the 

 shell is squarish and bears a thickened prominent apex, which 

 overhangs the margin and is turned very slightly to the right; 

 color a very pale yellowish, apex nearly white; sculpture consists 

 of faint semicircular wrinkles, absent from apex; lower surface of 

 shell covered with a very thin membrane, which is produced 

 beyond the edge and forms a short border. 



Length 7 J mill., breadth 5 mill. 



Var. pallida. Shield and body opaque white color, with 

 a faint yellowish tinge. 



Occurs on bushes at Mozambique in considerable abundance; 

 the rich orange color of the mollusc contrasting very beautifully 

 with the dark green foliage to which it clings. The variety is 

 found with the type and is also somewhat common. 



U. Kirkii, Gray,* the species on which the genus is founded, 

 seems to be quite distinct. A nearly allied species occurs at 



* Pro. Zool. Soc, 1864, p. 250. 



