130 



Transactions of the Royal Society of South Africa. 



marginal teeth were even more numerous. The rows of teeth trend slightly 

 forwards on each side. The radular formula is : (54+22-1-1 + 22+53) X 128. 



The radula of a young specimen measures about 4-8 X 2-1 mm., and 

 differs slightly from that of the adult in that the ectocones of the marginal 

 teeth are a little longer. Its formula is : (51 + 18+1 + 18+49) X 132. 



The remainder of the anatomy of this species is unfortunately unknown, 

 the specimens examined being in a very bad state of preservation ; but the 

 characters of the foot, jaw, and radula prove that it is rightly assigned 

 to the Zonitidae, and that Mollendorff was wrong in transferring it in 

 1903 to the Rhytididae. It cannot be retained in the defunct Nanina, 



71 



60 



B 



Text-fig. 6. — Zingis morrumbalensis (M. and P.), Macequece. 



A. Jaw ; X 9. 



B. Representative teeth from the radula ; X 22,5. 



but it is somewhat doubtful in what genus to place it. The shell, however, 

 is very near akin to that of the common Nyasaland Helix whytei of Smith, 

 which that author subsequently attributed to Zingis ; it may be well, 

 therefore, to arrange the two species next each other in that genus until 

 more is known of their anatomy. 



Subfamily LEDOULXIINAE. 



Genus Ledoulxia Bgt., 1885. 



Ledoulxia, hloyeti (Bgt.), 1889. 



1889. Trochonanina hloyeti Bgt., Moll, de I'Afr. equat., p. 21, pi. 2, 

 figs. 10-12. D.F. 



Hah. L. Marques. Mtisherra R. Valley ; Zangwe Basin (Cressy). 

 Described from Kondoa, Usambara, and unknown hitherto from any 



