'10 ZOOLOGISCHE MEDEDEELINGEN — DEEL IV. 



Fam. Limnaeidae. 



Is i dora Ehrenberg. 



1. Isidora gibbosa Gould. 



Gould. Proc. Boston Soc. Nat. Hist. Vol. 11,1847, p. 42. Smith. Journ. Linn. Soc. 

 N. S. Wales, Vol. XIV, 1881, p. 278, PI. 6, fig. 3—6. Clessin. Martini-Chemn., 

 Conch. Cab. Ed. II, Vol. I, Abth. 17, p. 253, PI. 34, fig. 15. 



Lake Sentani, muddy shore, Jan. 19, 1911. 



The only specimen agrees in shape and especially in length of spire, 

 rather well with the quoted fig. 5 of Smith. The figures of Clessin are 

 poor copies of Smith's figures. The specimen is slightly worn, somewhat 

 broken at the aperture, so the identification is a little doubtful. 



Order Prosobranchia. 



Suborder Pectimbranchia. 



Fam. Melaniidae. 



Mel a nia Lamarck. 



1. Melania ( Steno melania) uniformis Quoy & Gaimard. 



Quoy & Gaimard. Voy. Astrolabe, Vol. Ill, p. 154, PI. 50, fig. 30—35. Brot. 

 Martini-Chemn. Conch. Cab. Mon. Melania, p. 124, PL 15, fig. 3. PL 16, fig. 1. 

 v. Martens. Siiss- u. Brack w. -Moll, des lnd. Arch. p. 40. 



Mbai-river. 



The specimen agrees especially with fig. 3a of PI. 15 of Brot's Mono- 

 graph, but is smaller, the length of the truncated specimen being 43 

 mill. As the upper whorls are wanting, their sculpture could not be made 

 out, the uppermost of the remaining whorls are spirally striated all over. 



2. Melania (Stenomelania) hastula Lea. 



Lea. Proc. Zool. Soc. London, 1850, p. 189. Brot. Martini-Chemn. Conch. Cab. 

 Ed. II, Mon. Melania, p. 129, fig. 3, 3a— d. v. Martens. Suss- u. Brackw. Moll, 

 des lnd. Arch. p. 41 (plicaria). 



Branch of the Mbai-river near Hollandia, May 6, 1910. 

 The young specimen is relatively smooth, the sculpture being rather 

 faint, in this respect it agrees with Brot's fig. 3. 



3. Melania (Stenomelania) pantherina v. d. Busch. 



v. d. Busch. Malak. Blatter, 1858, p. 33. Brot. Martini-Chemn. Conch. Cab. 

 Ed. II, Mon. Melania, p. 172, PL 20, fig. 8, 8a, b. 



Rivulet in the Tanah-Merah-bay, Aug. 18, 1910. 

 Both specimens are very young, consequently of somewhat doubtful 

 identification, however I find no species which is nearer allied. 



