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. 



Chlamydephorus Gibbonsij W. G. Binn. 



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

 mity. Sole not differentiated into parts, smoothish, 5 millim. 

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

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

 less of a pale dorsal line of ground-colour. Reticulations 

 polygonal, with the interstices minutely subdivided. Sole 

 slightly transversely grooved, ^lantle none. 



Described from a specimen in the British Museum from 

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



Apera^ the name proposed by Ileynemann for this genus, 

 will probably have to be used. Chlamijdopltorus (llarl.) was 

 proposed for a genus of jMammalia as early as 1825. 



[To be continued.] 



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

 September 16, l«yO. 



XLVI. — A List of the Species of Achatma. from South Africa j 

 with the Descrijotion of a neto 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 

 a])pcared that it would be useful to get together a list of all 

 the forms known to occur in the southern ])ortion of the 

 African continent. This I have done, arbitrarily limiting the 

 area on the north at the 20th parallel. 



Already as many as eighteen sj)ecies have been described, 

 and doubtless this number eventually will be increased con- 

 siderably when this region, and esjiecially the mountainous 

 parts, has been more completely exjjlored. 



A number of the Achatimr from various parts of Africa 

 seem to ditl'er only very slightly from allied forms, and it 

 may fairly be anticipated that tlie separation of species will 

 become more and more dithcult through the discovery of 

 intermediate forms in parts hitherto unexplored. 



