390 Mr. E. A. Smith on Species of 



projection. It is possible that jmnctulatus may be a distinct 

 species ; but there is not yet sufficient evidence for classing 

 it as such. 



CMamydepJiorus Gibhonsij W. G. Binn. 



Length 47 millim., orifice 7^ millim. from posterior extre- 

 mity. >Sole not diiferentiared into parts, smoothish, 5 millim. 

 broad. Tentacles (eye-peduncles) pale bluish grey. Colour 

 pale yellowish, becoming dark grey on back, witli more or 

 less of a pa]e dorsal line of ground-colour. Reticidations 

 polygonal, with the interstices minutely subdivided. Sole 

 slightly transversely grooved. ]\Iantle none. 



Described from a specimen in the British Museum from 

 Cape Colony {F. P. M. Weule). 



Apera^ the name proposed by Hcynemann for this genus, 

 "will probably have to be used. ChlamydopJiorus (llarl.) was 

 proposed for a genus of IMammalia as early as 182-3. 



[To be continued.] 



3 Fairfax Road, Bedford Park, Chiswick, W., 

 September 16, 1890. 



XLVI. — A List of the Sj)ccies of Achi\t'uva,froin South Africa, 

 with the Description of a new Species. By Edgar A. 

 Smith. 



In the endeavour to identify the new form hereafter described 

 it was necessary to find out what species were already known 

 from the region where it was discovered. In doing this it 

 appeared that it would be useful to get together a list of all 

 the forms known to occur in the southern portion of the 

 African continent. This I have done^ arbitrarily limiting the 

 area on the north at the 20th parallel. 



Already as many as eighteen species have been described, 

 and doubtless this number eventually will be increased con- 

 siderably when this region, and especially the mountainous 

 parts, has been more completely explored. 



A number of the Achatince from various parts of Africa 

 seem to differ only very slightly from allied forms, and it 

 may fairly be anticipated that tiie separation of species will 

 become more and more difficult through the discovery of 

 intermediate forms in parts hitherto unexplored. 



