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JOURNAL, R.A.S. (CEYLON). [VOL. XT. 



returned with several full-grown examples (alive), also some 

 ova and embryonic shells. Altogether a fairly complete 

 series has been examined. 



For information relating to habitat, &c, I am indebted to 

 Mr. John Pole, in whose honour this species has been named. 



Acavus (poleii) strongly recalls A. waltoni (Reeve), to 

 which it is closely allied. It is readily distinguished 

 however by its somewhat narrower and more solid shell, its 

 much paler colour, and especially by its pure white 

 peristome. The last feature is as constant as the very dark 

 brown or black peristome of A. waltoni, the species which 

 abounds in our hill districts. 



The animals of the two species present marked differences 

 in colouration and appearance, as follows : — 



Acavus (jpoleii). — Animal mouse-colour; head andtentacles 

 dark brown ; foot-sole pale brown, with purple marginal 

 fringe. Egg (largest specimen) 25 mm. long, 16 mm. broad. 



Acavus waltoni. — Animal dark inky-blue ; tentacles deep 

 bluish-gray; foot-sole dirty white, with fringe of pale indigo. 

 Egg (largest specimen) 22 mm. long, 13 mm. broad. 



Distribution. — Acavus (poleii) appears to be restricted to 

 the forests of the Southern Province, where neither of the 

 other allied species of the genus are known to occur. 



The distribution of the recorded species of Oligospira * 



appear to be as follows : — 



Acavus (Oligospira*) shinneri (Reeve). — Pattipola, Province of Uva, 

 5,000 ft. (Haly). 



Acavus (- ) waltoni (Reeve). — Common throughout the Central 



Province, 2,000-4,000 ft. 



Acavus ( ) (poleii, n.sp). — Udagama, Southern Province, 500 ft. 



(Pole). 



6. The following Paper was then read by its author : — 



* In 1894 Jousseaume proposed to separate the flattened species from 

 the more turbinate forms of Acavus by the creation of a subgenus 

 Acavella. (Memoires de la Societe Zoologique de France, 1894, p. 288.) 

 But Ancey had already introduced Oligospira in the Conchologists' 

 Exchange (II., p. 22, 1887), and as the latter term has been accepted by 

 Pilsbry (Manual of Conchology, Series II., Vol. VI., p. 82) it has been 

 adopted here. 



