8 MELVILL & STANDEN, Mollusca from N.E. Rhodesia. 



Hab. Bed of Mterize River, May 23, 1905. Also 

 from Ndola, Kafue River, at 4,000 feet. 



A small Planorbis, allied to P. natalensis, Krauss, but 

 of inferior size, with the disks both more deeply excavate 

 proportionately. Described originally from examples 

 collected in the Transvaal by Colonel Bovvker (E. L. 

 Layard). This shews a great northward extension of its 

 range. 



Fam. PHYSID.E. 



Physopsis africana Krauss. 

 Physopsis africana, Krauss, " Siidafrik. Mollusken," p. 85, pi. 5, 

 fig. 14, 1848. 



Hab. Bed of Mterize River, May 23rd, 1905. Also in 

 the Kafue River, near Ndola. 



A well-known tropical and South African species, 

 occurring as far south as Natal. Our specimens seem 

 intermediate between the type and P. ovoidea Bgt, which 

 surely can be but a variety. This latter shell is figured 

 by von Martens {I.e. pi. 6, fig. 13). 



Fam. Testacellid,e. 

 Streptaxis nseudweensis Putzeys. 



Streptaxis nseudweensis, Putz., Ann. Soc. Malac. Belgique, vol. 

 34, Bull. p. lv. fig., 1899. 



Petauke, at 2,400 feet. 



One specimen only, immature. The species is beauti- 

 fully longitudinally striate on the upper portion of the 

 whorls. 



Distrib., Congo, W. Africa. 



Fam. LlMAClDiE. 



Helicarion nyassanus Smith. 



Helicanon nyassanus E. A. Smith, Proc. Zool. Soc. Loud., 1899, 

 p. 582, fig. 9. 



