126 Transactions of the Royal Society of South Africa. 



any accessory organs. The vas deferens becomes slightly convoluted and 

 swollen next to the penis, forming an incipient epiphallus, but no trace of a 

 flagellum could be found. The penis is rather small, but this is probably 

 due to the immaturity of the specimens. 



Affinities. — This species appears to belong to the subgenus Gymnarion 

 Pilsbry.* It bears a considerable resemblance to Helicarion gomesianus 

 Morelet in its radula and in the coloration of the animal, as well as in its 

 reproductive organs being without flagella ; but it differs from that species 

 not only in having a more pronounced caudal lobe, but also in lacking an 

 amatorial organ. f According to Thiele, H. welwitschi Morelet appears to 

 resemble the present form more closely in its reproductive system, but in 

 that species the marginal teeth of the radula retain distinct ectocones.J 

 The other African species of Helicarion that have been dissected seem to 

 differ still more from the present species in their anatomy, notwithstanding 

 the general resemblance of their shells. 



Genus Kerkophorus G.- Austen, 1912. 

 Kerkophorus poeppigi (Menke), 1846. 



1854. Vitrina poeppigii Mke., Pfr., Conch. Cab., p. 17, pi. 2, 

 figs. 13-15. D.F. 



Hab. L. Marques. Eikatla (Junod). 



Included in Junod's list of 1899 ; I have not seen examples from the 

 locality. 



Genus GudeElla Preston, 1913. 

 {=Tha23siella Gude, 1911, non Fischer, 1884.) 



This genus was founded for numerous small zonitoid species, originally 

 attributed to Thapsia Albers, but very much smaller than the type of the 

 latter, troglodites Morelet. 



Pilsbry (1919) considered that there was not room for both genera, 

 but it is certainly convenient to have a distinct name for the smaller forms, 

 and the fact that I am able to give some details as to the anatomy of Gudeella 

 furnishes additional cause for preserving the genus-name until the anatomy 

 of the larger species is known. 



* Pilsbry ; Bull. Amer. Mus. Nat. Hist., vol. xl, 1919, p. 275 ; Watson : Proc. Malac. 

 Soc, vol. xiv, 1920, p. 112. 



f Watson : ibid., pp. 91-96, pi. iii. 



X Thiele: Deutsch. Zentral-Afrika-Exped. (1907-1908), vol. iii, 1912, pp. 190, 191, 

 198, text-fig. xii. 



