's RIJKS MUSEUM VAN NATUURLIJKE HISTORIE — LEIDEN. i\ 



4. Melania (Stenomelania) papuensis Quoy & Graimard. 



Quoy & Gaimard. Voy. Astrolabe, Zool. Vol. III, p. 157, PI. 53, fig. 45—47. 

 Brot. Martini-Chemn. Conch. Cab. Ed. II, Mon. Melania, p. 186, PI. 21, fig. 10, 

 10a. Tapp. Canefri. Fauna Mal. N. Guinea, p. 29. 



Brook near Hollandia. 



Three specimens, two of which are quite young; the third, though 

 larger, perhaps also not developed, resembles fig. 10a of Brot's Mono- 

 graph, but is smaller, darker (which may be partly due to the not 

 characteristic colour of Brot's fig., partly to the chemical reaction of the 

 water) the whorls are slightly more convex than in Brot's fig. 10. Ac- 

 cording to these figures and to the description, the species seems to be 

 variable; Brot says: „base conspicuously and deeply striated," which 

 cannot be said of the specimens under consideration, the striae being 

 rather faint. Though the identification is slightly uncertain, I cannot 

 resolve to describe a new species, the specimens seem to be too nearly 

 allied to M. papuensis to justify such an act, considering the great vari- 

 ability in most species of this genus. 



5. Melania (Stenomelania) dominula Tapparone Canefri. 

 Tapp. Canefri, Fauna Mai. N. Guinea, p. 31, PL, fig. 16. 



Zoutbron, June/ July, 1910. 



The smaller specimens very much resemble the figure and rather well 

 the description of Tapp. Canefri (1. c.) ; the larger ones (the largest has 

 a length op 22 mill., 16 in the type) seem to be the same species, though 

 considerably darker, with less developed sculpture; there are interme- 

 diate ones. 



6. Melania (Melanoides) siibcostellaris n. sp., PI. I, fig. 6. 



Shell turreted, rather thin and glossy, rather dark yellowish-olive, 

 with a row of purplish-brown blotches below the suture and more or 

 less interrupted or continuous flammules of the same colour on the whorls. 

 Spire truncated, remaining whorls till 5, rather convex, slightly contracted 

 near the suture, which is deep and slightly tabulate, especially in the 

 lower whorls ; sculpture consisting of very fine growth-lines on the whole 

 surface, upper whorls often costate and with regular flat lirae, separated 

 by conspicuous grooves, often less conspicuous on upper part of whorls, 

 on the last whorls partly crispate; moreover these last whorls are irre- 

 gularly costate, the costae running from suture to suture; on the last 

 whorl the base has a few spiral ridges. Aperture rather narrowly ovate, 

 with sharp upper angle, nearly rounded below, but slightly pinched, 



