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



Trochomorpha Albers. 



I. Trochomorplia: planorbis Lesson. 



Lesson. Voy. Coquille. Zool. II, p. 312, PL 13, fig. 4. 



v. Martens. Ostas.. Landschn. p. 249, PI. 13, fig. 4, (var. Lessoni). 



Tapp. Canefri. Fauna Mal. New Guinea, p. 89. 



Boettger. Bericht Senckenb. naturf. Ges. 1891, p. 262. 



Tryon. Man. of Conch. Ser. II, Vol. III, p. 82, PL 16, fig. 78—82. 



New Guinea. v. Weel's Camp. May 29, Sept. 18, 1907; Lorentz River, May 11, 1907; Sabang, 

 June 5, 1907; Geitenkamp, July 20, 1907; Bivak Island, Sept. 15, 1909; Van der Sande River, 

 Sept., 10, 1909. 



The spécimens hâve on their base faint spiral striae and so belong to var. Lessoni 

 v. Mart. or Tr. approxïmata le Guill. (Rev. Zool 1842, p. 139), BOETTGER, Le. seems to 

 be of opinion that this form represents the type of LESSON. Both authors are inclined to the 

 suggestion that according to the différences in sculpture, one ought to distinguish 3 species. 

 In the spécimens from N. Guinea, the spiral striation of the base is very variable, in some 

 spécimens sarcely traceable, this circumstance certainly does not plead for that view, and 

 so I hâve left them with Lesson's name. 



Fam. Helicidae. 

 Camaena (Alb.) Pilsbry & v. Môllendorff. 



1. Camaena gndei n. sp. PI. IV, fig. 8. 



Shell thin, depressedly-conoid, narrowly umbilicated, last whorl faintly keeled, con- 

 spicuously dilated towards aperture, dark reddish-brown, with an inconspicuous, narrow, darker, 

 peripheral band, and a faint lighter zone below it. Whorls about 4'/ 2 > slightly convex, 

 separated by a shallow suture, deeper on last whorl and suddenly descending at a little 

 distance from the aperture. Apex blunt, nuclear whorls large, with riblike striae, uppermost 

 part however slightly eroded. Sculpture of post-nuclear whorls with the same riblets above 

 and below, with oblique rugosities, most conspicuous on last whorl, above periphery; base of 

 shell with irregular rugosities, which hâve however a more spiral direction ; aperture oblique, 

 depressedly semi-elliptical, with a slightly thickened, strongly reflected peristome, of a purple- 

 brown colour; columellar margin oblique, running insensibly into the basai margin, thickened 

 and triangularly dilated above, and for ~/ 3 covering the narrow, deep umbilicus. 



Diam. maj. (incl. perist.) 34, ait. 25, apert. ait. (diagonally, without perist.) 137a) lat- 16 mill. 



New Guinea. Hellwig Mounts. Oct. 1909. 2500 M. 



I know no nearly allied species ; the only spécimen contains the dried soft parts, its 

 yellowish epidermis has a tendency to become loosened and causes some accidentai yellow 

 spots on the shell. I hâve named it in honour of Mr. G. K. GUDE, who often has assisted 

 me in comparing doubtful spécimens. 



