The Non-Marine Mollusca of Portuguese East Africa. 119 



The raclula of a specimen of Gulella infans (Crvn.), from Pietersburg in 

 tlie Transvaal, differs somewhat from that described above. The cusps of 

 the teeth are a little shorter relatively to the curved bases ; they point more 

 directly backwards ; the apophyses are more prominent ; and the radula 

 is not so long, the formula being : (21 + l + 21)x 89. 



While disinclined to add another species to the already over-elaborated 

 infans group, the Macequece shells differ so greatly from typical infans in 

 the appearance of the last whorl that, taking into consideration the 

 difference in the radula, it appears to me that specific, rather than 

 varietal, distinction is advisable. 



The measurements of three other shells from Macequece are : shell 4-6, 

 last whorl 2-6 ; shell 5-0, last whorl 2-8 ; and shell 5-4, last whorl 2-9 mm., 

 the last whorl thus considerably exceeding half the total length of the shell, 

 whereas in infans it averages about one-half of the total length. 



Distributed very sparingly with the foregoing are a few examples which 

 would have been mistaken for a distinct species if encountered alone. They 

 are longer and broader than the majority of the local race, with the appear- 

 ance of weaker sculpture and dentition, though these features are really 

 normal, the apparent weakness being due to the superior size of the shells. 



Two specimens measure 6-7 X 2-9, last whorl 3-4; and 6-3 X 2-6, last 

 whorl 3 mm., respectively. 



Gulella perspicuaeformis (Sturany), 1898. 



1898. Ennea perspicuaeformis Stur., S.A. Moll, p. 17, pi. 1, fig. 2. D.F. 

 Hab. L. Marques. Delagoa Bay (Penther). 

 A minute species well illustrated by its author. 



Gulella far quhari (Melv. and Pons.), 1895. 



1895. Ennea farquhari M. and P., A.M.N.H. xvi, p. 478, pi. 18, figs. 

 3-5. D.F. 



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



One of several instances, to be hereinafter mentioned, of a minute 

 species, only known hitherto from the extreme south of the continent, 

 occurring over 1000 miles to the north without an intermediate locality. 

 The Macequece shells are nearer the type than are either of the varieties 

 advena Bnp., or berthae M. and P., the most noticeable points of difference 

 lying in the somewhat smoother surface and wider, and therefore less 

 obstructed aperture, while the tooth on the outer lip is usually narrower 

 and less inclined to be bifid than in typical farquhari ; they do not appear 

 to me to be varietally distinct. 



