132 Transactions of the Royal Society of South Africa. 



anatomy of specimens said to belong to this species, the German author's 

 examples having been collected at Tette, the type locality ; but their 

 descriptions and figures do not altogether agree either with each other or 

 with the anatomy of specimens collected by Junod in the Lebombo Moun- 

 tains. It therefore seems advisable to give a brief account of the more 

 important organs of the animals from this locality. 



Foot. — The foot-sole is conspicuously tripartite by a pair of deep longi- 

 tudinal grooves, the median area being of about the same width as the 

 lateral areas towards the anterior end of the foot, but becoming narrower 

 posteriorly. A large caudal mucous pore is present, extending as a vertical 

 slit down to the extremity of the sole, and thus differing from Godwin- 

 Austen's description and fig. la. The mucous pore is overhung by a pointed, 

 pigmented, caudal process, which was abnormally bifurcated in one of the 

 specimens examined (see PI. VIII, fig. 2). In the other specimens it was in- 

 termediate in length between the long appendage figured by Godwin- Austen 

 and the very short one shown in von Marten's drawings.* The foot-fringe 

 is bounded above by a well-defined peripodial groove on each side, which 

 bends up at the hind end in front of the mucous pore, and then runs along 

 the side of the caudal process in normal specimens. Just above the peri- 

 podial groove a second horizontal groove runs along each side of the foot, 

 and this receives oblique grooves, of which the more posterior arise from a 

 median longitudinal groove on the top of the hinder part of the foot. This 

 part of the foot is laterally compressed, but it bears no keel, such as Godwin- 

 Austen mentions. 



Mantle and pallial organs. — The mantle-edge bears the usual right 

 and left body-lobes, the left being divided into two separate portions 

 having the form shown in text-fig. 7, B. No shell-lobes are present. The 

 thin skin covering the mantle-cavity and upper whorls is beautifully mottled 

 with dark pigment and opaque white patches after the manner shown in 

 PI. VIII, fig. 1. The roof of the mantle-cavity or lung does not display 

 a marked pulmonary reticulation, but numerous slender veins can be dis- 

 tinguished in addition to the large pulmonary vein which runs to the 

 heart from the neighbourhood of the respiratory opening (text-fig. 7, B). 

 Semper states that the kidney is short. In the specimens from the Lebombo 

 Mountains it is long and narrow, being about 9 mm. long, that is to say 

 about half the length of the mantle-cavity, with an average breadth of 

 scarcely more than 1 mm. The ureter arises from its extreme front end, 

 passes backwards along its upper edge, and then forwards immediately 

 beneath the rectum as far as the anus, the secondary ureter being closed 

 throughout. 



Central nervous system.- — The nerve ring (PL VIII, fig. 4) is small, and 

 * Deutsch-Ost-Afrika, vol. iv, 1897, pi. i, figs. 8, 8«, 86. 



