IÔ2 M. M. SCHEPMAN, LAND- AND FRESHWATER MOLLUSCA ETC. 



Planispira Beck. 



1. Planispira (Cristigibba) tortilabia Lesson. 



Lesson. Voy. Coquille, Zool. Vol. II, p. 311, PI. i3 : fig. 1. 

 Tapp. Canefri. Fauna Mal. New Guinea, p. 171. 

 Pilsbry. Man. of Conch. Ser. II, Vol. VI, p. 294. 



Ara Islands. Fenuabori River. Dec. 5, 1907. 



Of the 3 spécimens one is young, one eroded, the third, though a dead shell, belongs 

 by its rosy peristome and (slightly bleached) upper whorls, to the typical form A. var. (3. 

 of Tapp. Canefri (Le. p. 172). 



Forma B. Tapparone Canefri. 



Tapp. Canefri. 1. c. p. 172. 

 Reeve. Conch. le, Hélix, fig. 498. 



New Guinea. Lorentz River. Sept. 5/12, 1909. 



The spécimens vary much in size and colour, the largest full-grown spécimen has a 

 diam. maj. of 22 mill., inclusive of the peristome, and should be typical, according to the 

 measurements of PlLSBRY, but the peristome is more expanded than in the spécimens from 

 the Aru-isles, which are also larger (diam. maj. 23'^ mill.) ; the smallest spécimen reaches 

 only 18 1 /., mill. The peristome is white or rosy, the spécimens are bandless, in most cases 

 with 2 brown bands or with one large brown band, occupying the space of the usual 2 bands. 



2. Planispira (Cristigibba) plagiocheila Tapp. Canefri. 



Tapp. Canefri. Fauna Mal. N. Guinea, p. 174, PL 5, fig. 4 — 7; PL 7, fig. 6. 

 Pilsbrv. Man. of Conch., Ser. II, Vol. VU, p. 295, PL 52, fig. 82— 85. 



New Guinea. Bivak Island, July, 12, 1907; Sabang, July 15, July 18, Sept. 18, 1907; Lorentz 

 River, Sept. 25, 1909; Alkmaar, Nov. 1909. 



Varying slightly in size, the largest diameter differing from about 17 to 18 mill. and 

 in colour, the upper whorls being in some spécimens rosy; the last whorl is more or less 

 dark brownish, with a lighter yellowish zone below the suture, and the base is likewise lighter. 

 T find no distinct bands but the upper part of the brown zone is slightly darker. The velvety 

 epidermis is in most cases preserved, but it is very difficult to see the hairs. 



var. albolabiata n. var. 



Much smaller than the type, uniformly whitish, epidermis yellowish, peristome white. 

 Diam. maj. (of largest spécimen) 14, ait. (of last whorl) 7"., mill. 

 New Guinea. Alkmaar, Aug. 16, 1907; Lorentz River, Sept. 25, 1909. 



I can see no more than a variety of P. plagiocheila in thèse shells, they agrée in shape 

 with the type, the epidermis has the same structure. The spécimens from the Lorentz-river 

 are quite young and so it is uncertain if the peristome should be white if full-grown, as they 

 agrée however in every other respect, with the spécimens from Alkmaar, I think they may 

 be united, the more so, as in so many of the species of Cristigibba, the colour of the peri- 

 stome proves to be variable. 



