46 



PROCKKDINGS OF THK M ALACOLOGICAL SOCIETY. 



The ratio of height to Avidth sliows, as is substantiated by further 

 measiireuients taken but not recorded here, that in the Liter stages 

 of development the shells are proportionately high for their width. 



A remarkable shell, much larger than any other that I have 

 examined, local or foreign, collected by Major Connolly at Victoria 

 Falls, measures 2-8 mm. high and 2"5 mm. wide, the ratio of height 

 to width being 112 to 100. It has 4-k whorls. 



Eoth this species and the following are ovoviviparous, many of the 

 specimens examined containing one young mollusc furnished with 

 a shell, and some few containing two, one much larger than the 

 other. 



Mr. H. Suter and Dr. H. A. Pilsbry concur in fhe determination 

 of this form. 



2. PUPISOMA Japonicum, Pils.' 



T have not received specimens of this species from anj- of my 

 South African correspondents, but have mj'self collected it at Maritz- 

 burg, Edendale, Karkloof, and Xtimbankulu, Natal; commensal 

 with P. orcula on indigenous trees and shrubs. The following are 

 some of the measurements that I have taken of apparently mature 

 specimens : — 



By these figures it will be seen that this species is much truer to 

 a normal proportion than F. orcula, the ratio of height to width 

 remaining nearly constant. 



In this species I cannot find any trace of the minute spiral strife 

 to be seen in P. orcula, Eens., puhisculum, Issel, and other species. 



As compared with P. orciila, Japonicum is of a much more regular 

 form, strongly suggesting Trifioncplirua (/lohulus (Miill.) in miniature. 

 Ey this ditference in form, by the umbilical perforation being open 

 instead of nearly covered by the triangular reflection of the columellar 

 lip, by the absence of the revolving strife, and by the much smaller 

 size, this species is easily separable from P. orcula. 



I have submitted examples to Dr. H. A. Pilsbry, who confirms 

 the above determination. 



' Nautilus, vol. xvi, p. 21, 1902. 



