229 



ON A COLLECTION OF LAND AND FEESHWATER MOLLUSCA 

 FEOM JAVA. 



By M. M. SCHEPMAN. 



Read 14th June, 1912. 



PLATE X. 



During his star in Java Mr. E. Jacobsoii collected amongst other 

 objects of Natural Histor}- some molluscs, the majority consisting of 

 ]ancl and freshwater species, ^vhit•h he had the kindness to send to 

 me for identification and description ; amongst them I found a few 

 forms which appear to be new to science, and as the accurate 

 localities give a real importance, even to the more common and 

 already known species, I now give a list of all of them. 



1. Yjxrinopsis Collingei, n.sp. PI. X, Figs. 1, 2. 



Animal of a light flesh-coloured tint, which on its upper surface 

 is only clearly visible beneath the shell and on the foot-fringe, the 

 neck of a rather dark slate colour, as well as the upper tentacles, the 

 sides of the anterior part mottled with faint spots of black pigment, 

 tlie dorsal face of the caudal part nearly quite blackish, mantle 

 blackish, with two lobes ; right mantle-lobe large, strongly black- 

 spotted, leaving only an arborescent figure of whitish colour ; 

 left lobe narrower, of the same colour, but of simpler pattern, with 

 only a few light-coloured branches; caudal part sharp, pointed 

 behind, without mucous pore, with a median dorsal groove of lighter 

 colour, and oblique furrows, running from the median groove towards 

 the posterior end; foot-friuge bordered above bj- a double, impressed 

 line. Foot-sole divided in a narrow median and two lateral planes, 

 flesh-coloured, darker behind. Shell depressed, thin, corneous; 

 whoiis slightly convex, four in number, of which about two form 

 a large nucleus, which is microscopically spirally striated, the striae 

 being ])itted; third whorl still finer and more remote, spirally striated 

 with plain strise, but as well as last whorl smooth and shining; last 

 whorl with fine growth-lines, which are partly fold-like and with 

 a crenulate infrasutural margin, bordered by a groove. Peristome 

 thin, aperture depressed. 



Length of animal about 30, breadth of foot 2-5 mm. ; largest 

 diameter of shell 8"o, height about 5 mm. 



JIab. — Nongkodjadjar, Tengger Mountains, January, 1911. One 

 specimen, in my collection. 



This species has much puzzled me ; the animal agrees in every 

 respect with Semper' s description of his genus Vitrinopsis, but the 

 shell with his genus Vitrinoidea. I have provisionally located it in 

 Vitrinopsis, as the mantle, though damaged, evidently consisted of 

 two separated lobes. I thought it not advisable to create a new 

 genus on a single damaged specimen. Mr. Jacobson has given the 

 following interesting account of the living animal: " The slug was 



