The Non-Marine Mollusca of Portuguese East Africa. 117 



The specific name was inadvertently misspelt in 1922 ; the correct 

 rendering is enneodon. 



Gulella sexdentata (von Martens), 1869. 



1869. Ennea laevigata Dhrn., var. sexdentata Mts., Nachr.-Bl. d. Mai. 

 Ges. i, p. 154. D. 

 . 1890. Ennea lianningtoni Smith, A.M.N.H. vi, p. 161, pi. 6, fig. 4. D.F. 



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



The smooth northern cousin of the southern G. gouldi (Pfr.), to which it 

 bears a close general resemblance except for the lack of visible sculpture. 

 The species was originally founded by von Martens as a six-toothed variety 

 of laevigata, so there is small wonder that Smith overlooked it when he 

 described and figured it under the name of hanningtoni. 



Its distribution extends northward as far as Zanzibar, and it has been 

 recently taken at Gwelo in Southern Rhodesia. 



Gulella infans (Crvn.), 1880. 



1880. Ennea infans Crvn., P.Z.S., p. 616, pi. 57, fig. 6. D.F. 



Hah. L. Marques. Masiene (Lawrence). 



A single small specimen, differing slightly from typical infans, but 

 resembling a set in my collection from Matopos, Rhodesia. The striation 

 is weaker, the sinulus more pronounced, and the tooth on the outer lip a 

 little nearer the paries than in infans, but all these discrepancies are very 

 slight. Moreover, Watson reports that there is no marked difference 

 between the male organs in the anatomy of the Matopos animals and those 

 of typical infans from Pietersburg, Transvaal ; in the radula of the former, 

 the teeth are slightly broader and a little less strongly curved towards their 

 anterior ends, and there are not quite so many of them in each transverse 

 row as in infans. These differences, however, are very small, distinctly 

 less than those that separate the radulae of infans and tristaoensis, and in 

 his opinion do not prove that the Matopos examples belong to a distinct 

 species. 



Gulella praelonga Conn., 1922. 



(Plate IV, fig. 5.) 



1922. Gulella praelonga Conn., A.M.N.H. x, p. 115. D. 



Hab. L. Marques. Mount Vengo, Macequece (Cressy). 



The type contains 7^ whorls and measures 8-8 x 3-5 mm. The largest 

 example seen, with 8| whorls, measures 9-6 X 3-4, and a peculiarly small 

 one, with 7-|- whorls, 7-2 X 3-0 mm. 



This giant member of the infans group calls to mind the Mascarene 



