The Non-Marine MoUusca of Portuguese East Africa. 189 



L. Marques. Itschongove (fide von Martens) ; Lebombo Marsh, 

 Rikatla (a small, acuminate form, somewhat comparable to L. xmdussumae, 

 Mts.) ; L. Mhandlen ; Makulane (Junod). 



When we consider the range of variation which is acknowledged in such 

 European species as Limnaea pereger and L. truncatula without, in many 

 cases, even a varietal name being considered necessary, it is evident that far 

 too many specific names have been bestowed on forms of the African 

 L. natalensis which are less worthy of varietal rank than many that occur 

 in the European species. I have not, therefore, attempted to fit any such 

 names to the shells from the above-mentioned localities, which differ a little 

 in comparative breadth and contour, but are certainly not varietally 

 distinct from one another. 



Family PHYSIDAE. 



Genus Physa Draparnaud, 1801. 



Physa mosamhiqiiensis Clessin, 1886. 



1886. Physa mosamhiquensis, Cless., Conch. Cab., p. 366, pi. 54, 

 fig. 4. D.F. 



Hah. L. Marques. Tette (Peters). 



The subjoined outline, representing the largest example in the Berlin 

 Museum, has been kindly furnished by Dr. Thiele, who informs me that the 

 radula confirms the appearance of the shell as being that of a true Physa ; a 



Text-fig. i'3. — Phym mosambiqutnvis Clessin; X2. 



most interesting fact, since only one other species of this genus, Physa 

 waterloti, Germain,* has hitherto been recorded from Central or South 

 Africa. 



I may mention, however, that I have in my hands for description 

 the shell of a third species, unmistakably that of a Physa, from Lake 

 Naivasha. 



P. waterloti, originally recorded from Dahomey, has since been 

 collected by Dr. J. W. S. Macfie, of the Liverpool School of Tropical 

 Medicine, at Accra, Gold Coast. 



* Bull. Mus. Paris, 1911, p. 322. 



