ZOOLOGISCHE MEDEDEELINGEN — DEEL IV. 



but as the peristome, especially the columella has been broken, it cannot 

 sufficiently be described, it is rather large (diam. maj. 23' / 2 mill.) and 

 resembles Everettia subconsul Smith, a species from Borneo ; as mentioned 

 above, I am not aware that this genus lives on N. Guinea. In shape it 

 resembles the preceding species but is much larger, darker, has a deeper 

 suture and is perforate. 



Heli car ion Férussac. 



1. Helicarion sp. 



Mouth of the Sermorvai-river, March 20, 1911. 



This specimen has a very fragile peristome, so it is probably not a- 

 dult, I cannot identify it with any of the described species; the aperture 

 and base of shell are quite covered by the soft parts, which may not 

 be removed without crushing the shell, so it cannot be named and described. 



2. Helicarion sp. 



Clear rivulets of the upper part of Sermorvai-river, April 4, 1911. 



The systematic position of the specimen is rather uncertain, the mu- 

 cous pore of the tail has a long lobe ; as the soft parts quite cover the 

 base of shell and the specimen appears to be young, the peristome being 

 not developed, no good description can be given. Much smaller than the 

 preceding species. 



Sitala H. Adams. 

 1. Sitala arithropophagorum Hedley. 



Hedley. Proc. Lin. Soc. N. S. Wales, Vol. IX, Ser. 2, 1894,- p. 385, PI. 24, 

 fig. 1, 3. PL 26, fig. 21, 24. 



Near the Bewani-river, July 4, 1910. 



The specimen is still young and has the spirals of the base of shell 

 rather faint, but sufficiently visible under a strong lens. 



2. Sitala crenocarinata n. sp., PL I, fig. 2. 



Shell conical, rounded at the base, carinate at the periphery, very 

 thin, shining, smooth, but for faint growth-striae, translucent, light corn- 

 eous, subperforate. Whorls 5'/ 2 , rather convex; sculpture consisting of 

 faint growth-striae, fainter on the base, apex smooth, base w T ith close, 

 regular, spiral striae ; a thin keel runs along the post-nuclear whorls and 

 at the periphery of last whorl, which is angular, especially at its com- 

 mencement, less so near the aperture; this keel is threadlike and cren- 

 ulated by short, impressed striae above and below it, running backwards 



