IÔ.4 M. M. SCHEPMAN, LAND- AND FRESHWATER MOLLUSCA ETC. 



This variety is very variable in its banding, most spécimens are two-banded, one from 



Sabang has a narrow third band below the upper one, two are bandless, approaching the 



var. simplex; the colour of the peristome and environment is in most cases as deep black as 



can be expected in shells, but one or two spécimens from Sabang, amongst which a tri- 



.fasciate var., which is not quite adult, hâve it more dark purple. 



C. var. albolabiata n. var. without any rosy markings, the peristome, as far as can be 

 made out, white. 



New Guinea. Lorentz River. Sept. 16, 1909. 



The spécimens hâve the peristome rather thin, but it seems to be improbable that this 

 circumstance should account for the white colour, as the rosy tints are lacking on the whole shell. 



Trachiopsis Pilsbry. 



1. Trachiopsis torresiana Hombron & Jacquinot. 



Hombron & Jacquinot. Ann. Sciences Nat. XVI, 1S41, p. 63. 



Le Guillou. Rev. Zool. 1S42, p. 138 (delessertiana). 



Gray. New Zealand, PI. 1, fig. 6, 7, (Taranaki). 



Crosse. Journ. de Conch. 1868, p. 172, PI. 6, fig. 6a (leucolena var. (3). 



Tryon. Man. of Conch. Ser. II, Vol. IV, p. 66, PL 14, fig. 78 (Taranaki). 



New Guinea. Merauke, 1904. Dr. Koch leg. 



In the synonymy hère mentioned, I hâve with the exception of the quotation of TRYON, 

 followed ANCEY (Journ. de Conch. Vol. LII, 1904, p. 295) and HEDLEY (Proc. Linn. Soc. 

 N. S. W., Vol. 41, 1916, p. 713). PlLSBRY in his Guide to the study of Hélices, Vol. IX, of 

 the Man. of Conch. Ser. II, p. 1 14, does not mention H. leucolena Crosse, and locates Tra- 

 chiopsis as a section of Planispira. As I think the resemblance with Planispira is not very 

 obvious, I hâve mentioned this section as a genus. Mr. Ph. DAUTZENBERG has kindly com- 

 pared the spécimens with the types of H. leucolena now in his possession, and stated that the 

 différences with var. /3 are very slight, that only the ribs of the last whorl are slightly coarser 

 in the spécimens collected by Dr. KOCH. As a variety of delessertiana, Ancey mentions a 

 var. major, which should be the same as leucolena Crosse typica. The measurements of the 

 spécimens under considération, vary from 15 to nearly 20 mill. In another tube are a few 

 spécimens from the same locality, differing from the other ones by being considerably flatter 

 above, the whorls are less rounded, with a shallow suture, by having a slightly darker colour, 

 partly still coarser ribs, especially on the base, and a more oblique columella, as thèse 

 characters are partly graduai and only the flatter spire with its conséquences (flatter whorls 

 and shallower suture) proves to be constant, I think it is provisionaly not advisable to describe 

 it as a new species, but wish to name it: 



var. dautzenbergi n. var., PI. V, fig. 1. 



Shell with spire and whorls flatter, suture shallow. 



Diam. maj. i9 3 / 4 , ait. il; apert. ait. diagonally 9, lat. (incl. perist.) 10 mill. 



Named in honour of Mr. Ph. DAUTZENBERG, who' has so greatly assisted me with 

 thèse doubtful forms. 



