126 GASTROCOPTA, AFRICA. 



"This little species belongs to the same group as Pupa 

 rupicola Say, P. pellucida Pfr., P. tripunctum Morelet, etc." 

 (Ancey). 



This Gastrocopta has a wide distribution in South Africa, 

 as recorded by Connolly. It is astonishingly similar to the 

 Antillean G. pellucida, but differs by having the terminations 

 of the peristome closer together, and often connected by a 

 barely raised lamina, though in other specimens they are not 

 actually continuous, the very short parietal film being wholly 

 appressed. As in G. pellucida, there is a little projection 011 

 the ctlumellar side of the angulo-parietal lamella, represent- 

 ing the forward end of the parietal lamella (fig. 16). The 

 figures are from specimens from Pienaar's Poort, Transvaal, 

 received from Mr. Connolly. In this lot the size varies from 

 length 2.1, diam. above aperture 0.9 mm. to 1.9 x 0.85 mm. 

 Mr. Bumup gives the dimensions of one of the "lirate var." 

 from Rustenberg as length 2.25, diam. 1 mm. 



P. ovampoensis M. & P. was placed in the synonymy of P. 

 damarica by Boettger; Messrs. Burnup and Connolly have 

 concurred. As it was described from Layard's collection, and 

 Ancey stated that his species was in that collection, it seems 

 likely that the types of both were from the same lot. There 

 was some error in Ancey 's statement of the diameter. Per- 

 haps he intended to write 1% mm., as Mr. Burnup has it. 

 According to Burnup, a very large specimen in his collection 

 from Johannesburg measures 2.5 mm. long, 1.11 diam. 



In a later paper Melvill and Ponsonby place P. ridibunda 

 in the synonymy of ovampoensis, stating that "every inter- 

 mediate occurs." Mr. Burnup takes the same view. The 

 original description, given below, does not notice the palatal 

 plica?, but these were also overlooked in the original account 

 of ovampoensis. 



Pupa ridibunda. "Shell minute, subrimate, brown, thin; 

 whorls 6, of which the apical is depressed, vitreous, the rest 

 impressed at the sutures, ventricose, closely, obliquely striate 

 under a lens ; aperture rotund ; peristome brownish, contin- 

 uous, and (particularly at the columellar margin) a little 

 thickened ; provided with three fold-like teeth : a rather prom- 



