RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. 13 



whorls and smooth last one (as far as concerns the spines) ; the largest 

 one has a length of 25 mill. 



9. Melania (s. str.) villosa Philippi, var. elongata n. var. 



Shell much smaller, more elongately-cylindrical. 



Branch of the Mbai-river, near Hollandia, May 5, 1910. 



This form has much puzzled me, at first I thought it might be a 

 new species, but I should not know how to differentiate it from M. cybele 

 Gould and M. villosa Phil., which are so very nearly allied. The direc- 

 tion of the spines, which, if complete, is decidedly outwards, induced 

 me to describe it as a new variety of M. villosa. The peristome is strong 

 and with an orange layer of enamel interiorly in the largest specimens, 

 which appear to be adult, the length of such a much decollated specimen 

 is 22 mill., its diameter about 12, in many specimens the length is 

 twice the breadth. A considerable number of specimens has been collected. 



10. Melania (Tarebia) kampeni n. sp., PI. I, fig. 8. 



Shell turreted, moderately strong, yellowish-brown, often with a 

 purplish band, just below the suture, (rarely with a similar zone on last 

 whorl), spire entire or nearly so ; full-grown specimens slightly truncated, 

 remaining whorls 8, nearly plane or slightly convex, separated by a 

 shallow suture, in most specimens slightly contracted below the suture. 

 Shell nearly smooth, often sculptured by shallow, spiral grooves, rarely 

 with a few rows of granules, upper whorls nearly quite smooth, but the 

 whole shell covered with hair-like growth -lines, base of shell smooth, the 

 spirals not developed on that part. Aperture ovate, with an acute angle 

 above, base compressedly rounded, more or less pronouncedly canaliculate. 

 Peristome thin, nearly straight; columellar margin concave, slightly 

 rounded, reflected above, margins connected by a thin layer of enamel. 

 Interior of aperture in most specimens colourless, rarely with a purplish 

 band at the base. 



Alt. (of largest specimen) nearly 29, lat. 10 ! /. v ; apert. alt. 10 7.,, lat. 

 5 7, mill. 



Tjahé-river, June 12, 1910. 



Upper part of Sermorvai-river, in rivulets and brooks, April 4, May, 1911. 



A rather variable species, as far as concerns colour and sculpture, as 

 described above, allied to M. maüiensis Lea, but differing from any 

 Tarebia, by the constriction of the uppermost part of last whorls and the 

 (nearly always) absence of granules. (Brot. (I.e.) p. 311, mentions a 

 few smooth species of aberrant form). This species is more slender than 

 mauiensis, it is without doubt new. Numerous specimens. 



