176 M. M. SCHEPMAN, LANU- AND FRESHWATER MOLLUSCA ETC. 



8. Melania (Plotia) scabra Millier. 



Mûller. Hist. Verm. p. 136. 



Brot. Martini-Chemn. Conch. Cab., Ed. II, Melania, p. 266, PL 27, fig. 14, 15. 



Tapp. Canefri. Fauna Mal. New Guinea, p. 48. 



New Guinea. Alkmaar, Oct. 6, 190g. 

 A fevv dead spécimens most probably belong to this species. 



9. Melania (Plotia) acanthica Lea, var. 



Lea. Proc. .Zool. Soc. Lond. 1850, p. 194. 



Brot. Martini-Chemn. Conch. Cab. Ed. II, Melania, p. 278, PI. 28, fig. 10. 



New Guinea. Lorentz River, May, 1907; Alkmaar, Oct. 6, 1909; Bivak Island, Sept. 27; 

 Oct. 8, 1907. 



V. MARTENS (Siiss- u. Brackw.-Moll. p. 62), lias considered this form to be a variety of 

 M. scabra, it is characterized by its ribs, which bear the spines ; the spécimens resemble 

 fig. 10c of Brot, with short spines, those from the Lorentz River are small, those from Alkmaar 

 on the contrary, very large, the largest spécimens reaching a length of 38 mill., in thèse latter 

 spécimens there are no spines on the last whorl, but only blunt knobs, forming a passage 

 to some spécimens from Bivak-island, where thèse knobs are scarcely visible and which would 

 hâve deserved a varietal name, were it not that they are connected to more typical spéci- 

 mens by intermediate ones, in such spécimens the spiral sculpture of the base is scarcely or 

 not at ail developed, and if one has in view one of thèse extrêmes, one should no doubt be 

 inclined to describe a new species. 



Fam. Viviparidae. 



Vivipara Gray. 



1. Vivipara laevïgata Bavay. 



Bavay. Nova Guinea, Vol. V, Zool. p. 272, PI. 14, fig. 4. 

 New Guinea. Sabang, Pandanus-marsh. July 20, 1907. 



One young spécimen agrées rather well with the description of Bavay and with a 

 type-specimen I hâve seen, it hashowever some rows of hairs, which are easily rubbed off 

 and which are often seen in young spécimens belonging to this genus. A différence of some 

 more importance, is that the whorls are faintly margined below the suture and not only 

 above it, as in the type, but as I hâve only one spécimen to compare, I cannot lay much 

 stress upon this circumstanee. 



2. Vivipara sp. 



New Guinea. Sabang, Pandanus-marsh. Juli 15, 1907. 



Two still younger spécimens from the same locality, are equally hairy, they differ from 

 the preceding species, by their whorls being shouldered. They are too young for description, 

 though I cannot identify them with any known species. 



