M. M. SCHEPMAN, LAND- AND FRESHWATER MOLLUSCA ETC. 185 



Long. 50, ait. 40 w 2 (umbones slightly eroded) diam. 2j\! 2 mill. 

 N. Guinea. Merauke, 1904. (Dr. Koch leg.) 



I cannot identify this species with any of those known from New Guinea. Dr. HAAS 

 who has seen the only spécimen, found some resemblance with C. ingens Dautz. (Journ. Conch. 

 1900, p. 105, Pi. 5) from the New Hebrids, but besides the différence of locality, that gigantic 

 species has a length of 150 mill., while the N. Guinean species by its thick margin, has not 

 the appearance of being young, moreover there are différences enough in the hinge etc. to 

 reject any idea of identification. 



4, Cyrena subtriangula n. sp. PI. VII, fig. 1. 



Shell thick, subtriangular, very inaequilateral, covered with a dark-brown epidermis, 

 which is however greenish near the ventral margin, so I ara not certain that the dark colour 

 is the natural one, rather smooth, but lamellose near the margins, surface with rather crowded» 

 irregular striae; interior white; umbones slightly prominent, not much eroded; anterior upper 

 margin nearly straight, rather short, posterior one long, convex, (damaged), ventral margin 

 not very convex, running with rounded angles in the upper ones. Lunular part nearly flat, 

 I can find no marked lunule. Right valve with three cardinal teeth, anterior one nearly per- 

 pendicular, not grooved, the other two more oblique, grooved. Of anterior laterals, the interior 

 one thick, curved, with a low point, exterior one small ; of posterior laterals the interior elongate, 

 thick, nearly straight, without real point, exterior one not very prominent. Left valve with 

 three cardinals, the two anterior ones grooved the third very oblique, rather long, sharp, 

 anterior latéral short, thick, high, posterior one elongate, thick, rather prominent. Muscular 

 impressions conspicuous, shallow; palliai line stro ng, margin of shell thickened. Ligament 

 slightly prominent. 



Long. 52, ait. 45, diam. 28 mill. 



New Guinea. Lorentz River. Sept. 2, 1909. 



The nearest allied species I can find is C. busclu Phil. (Abb. Vol. III, p. 78, Cyrena, 

 Pi. 2, fig. 2), but the umbones of the new species are less prominent, it is considerably more 

 inaequilateral, the anterior margin being more rapidly descending, the shell is consequently 

 relatively shorter and more triangular. 



Batissa Gray. 

 1: Batissa albertisii Tapparone Canefri, var. crassior n. var. PI. VI, fig. 8. 

 Shell thick, outline variable. 



New Guinea. Bivak Island, Tan., Febr., 1910; Kampong above Dumas River, Jan., 1910; Lorentz 

 River, May 5, 19, 22, 1907; Sept. 3, 5 — 12, 8, 1909; Van Weel's Camp, May 27, 1907. 



A large number of shells has been collected, the majority from the Lorentz River, with 

 the label Sept. 5 — 12, 1909; after repeated comparison I think the only way is to bring them 

 under B. albertisii Tapp. Canefri (Fauna Mal. N. Guinea, p. 289, PI. ir, fig. 1) as var. crassior, 

 the character „tenuiculis" in the original description being only applicable to the small, young 

 spécimens; they are variable in many respects, but nearly ail are without the soft parts and 



