128 Transactions of the Royal Society of South Africa. 



Well-developed body-lobes are also present, the left being divided into two 

 distinct, but contiguous, portions. 



The hinder end of the foot, the mantle-edge, and the roof of the mantle- 

 cavity are all darkly pigmented. The kidney, on the other hand, is yellow, 

 and therefore stands out conspicuously when the animal is extracted from 

 its shell. This organ (text-fig. 5, A) is rather narrow and about 3 mm. in 

 length, being practically three times as long as the pericardium. The ureter 

 is speckled with dark pigment, and arises from the front end of the kidney, 

 running back along its upper edge and then forwards again beside the rectum 

 to the anus. A single pulmonary vein can be seen passing backwards from 

 the neighbourhood of the respiratory orifice to the heart. 



The radula (text-fig. 5, B) measures about 1-125 X -6 mm. when flattened 

 out. The central and lateral teeth are tricuspid. Their mesocones are 

 rather long, projecting considerably beyond the posterior edges of the basal 

 plates. The endocones of the lateral teeth are narrow and inconspicuous, 

 being attached laterally to the mesocones ; the ectocones are short, but 

 quite distinct. The basal plates of these teeth have the usual somewhat 

 quadrate form. The marginal teeth are narrow, and about three times as 

 numerous as the laterals. They have narrow bases, and curved bifid cusps, 

 which are composed of the mesocones and the slightly shorter ectocones.* 

 Towards the edges of the radula the teeth become smaller and shorter, their 

 mesocones become blunter, and their ectocones split up into two or three 

 separate small cusps. The transverse rows of teeth trend slightly forwards 

 on each side, forming an obtuse angle in the centre. The radular formula 

 is: (31 + 10+l + 10+30)x77. 



Unfortunately in the only full-grown specimen available the internal 

 organs were in such a bad state of preservation that it is impossible to describe 

 the reproductive system, or to say anything definite about the affinities of 

 this snail, although the character of the pallial lobes suggests that it may 

 possibly be related to the South African forms which Godwin-Austen has 

 placed in the Peltatinae. 



GudeSlla insimidans (Smith), 1899. 



1899. Thapsia insimulans Smith, Proc. Zool. Soc, p. 583, pi. 33, 

 figs. 16-18. D.F. 



Hab. L. Marques. Headwaters of R. Inyamkarrara, 25 miles N.W. 

 of Macequece, 4500 ft. (Cressy) ; Maforga Siding (Mcdowell). 



A flatter, more compact little shell than the preceding, but with some- 

 what similar distribution, as, in addition to the type locality, Mt. Chiradzulu, 



* In one of the two radulae examined the ectocone was absent in the 10th, 11th, 12th, 

 and 18th teeth on the left side, a rather interesting abnormality. 



