M. M. SCHEPMAN, LAND- AND FRESHWATER MOLLUSCA ETC. 183 



5. Neritina (Clitlion) brevispina Lamarck. 



Lamarck. An. s. vert. Ed. II, Vol. VIII, p. 572. 



v. Martens. Martini-Chemn. Conch. Cab. Ed. II, Neritina, p. 156, PI. 17, fig. 1 — 4, 9. 



Tapp. Canefri. Fauna Mal. New Guinea, p. 73. 



Tryon. Man. of Conch. Vol. X, p. 65, PI. 23, fig. 16 — iS; PI. 24, fig. 19, 20. 



v. Martens. Sûss- u. Brackw.-Mollusken, p. 79. 



New Guinea. Etna Bay, 1904. (Dr. Koch leg.) Timor. Koinini River near Kupang, Aug. 21, 1909. 



The spécimens from Etna Bay hâve very short spines, in one young spécimen they 

 are lacking. As to the spécimens from Timor, they belong to the same form, thickly covered 

 by the chalky crust, which V. Martens (Mon. Neritina, p. 158) mentions, it is impossible 

 without removing this crust, which is no easy task, to state if the spécimens are shortly 

 spined or not at ail. 



6. Neritina [Clitlion) wallacei Dohrn. 



Dohrn. Proc. Zool. Soc. London. 1861, p, 206, PL 26, fig. 1. 

 v. Martens. Martini-Chemn., Ed. II, Neritina, p. 258 (Section Pictae). 

 Schepman. Tijdschr. Ned. Dierk. Ver. Vol. VI, 1882, p. 20, PI. 2, fig. 4. 

 Tryon. Man. of Conch. Vol. X, p. 40, PL 12, fig. 48. 



Aru Islands. Bendjina River, Dec. 4, 1907. 



The majority of spécimens belongs to the typical form without spines, in a large 

 number of colour-varieties, some being darker than those mentioned by me in 1882; TRYON 

 (1. c.) seems not to hâve known my paper, where I hâve shown that the species belongs to 

 Clitlion, as he refers it to his typical Neritinae; the lot collected by Dr. LoRENTZ, makes 

 my view, if necessary, still more obvious, as it contains a spinous variety: 



var. spinosa n. var. PL VI, fig. 6. 



Shell with from 1 to 3 short spines, colour about the same as in the type; mixed 

 with the typical form. 



A few typical spécimens hâve been occupied by a Pagurus, giving évidence that the 

 species seems to inhabit brackish water, exclusively or at least in part. 



Class PELECYPODA. 



Order EULAMELLIBRANCHIA. 



Fam. Cyrenidae. 



Cyrena Lamarck. 



1. Cyrena viridescens Tapparone Canefri. 



Tapp. Canefri. Fauna Mal. New Guinea, p. 285, PL 10, fig. 24. 

 New Guinea. Mimika, Febr. 19 10. 



Several fine spécimens hâve been collected. The majority lias the rugosities of the 

 posterior part of the shell more developed than in the quoted figure, but much less so, than 

 in C. divaricata Desh., as figured by SOWERBY in Reeve's Monograph, and only on the lower 



