232 PKOCKEDINGS OF THE MALACOLOGICAL SOCIETY. 



10. MlCEOPAKMAKION JaCOBSONI, II, sp. PI. X, Figs. 3-8. 



Hah. — Nongkodjadjar, January, 1911. Three specimens. 



Animal dark grey-brown, witli a leddisli tint, more predominating 

 in the smaller specimens, in the adult the dorsal anterior part darker, 

 with traces of a blackish longitudinal band on each side behind tlie 

 tentacles, very conspicuous in young ones, and a blackish streak on 

 each side of the tail; mantle of the same colour as body, with faint 

 blackisli spots, likewise conspicuous in the young ; body and mantle 

 rugose, but witliout warts ; ])eripodial groove distinct, fringe with 

 very faint dark lineoles at tlie anterior and posterior parts, 

 particularly faint in the adult. Keel of intestinal sac ratlier 

 sharp, with a few dark spots. Foot-sole with a median part, but 

 little darker th.m the sides of body, lateral parts darker. Caud;d keel 

 sharp, of slightly lighter colour; caudal mucous pore an oblique slit. 

 Leiigtli in alcohol about 40 mm. 



Shell convex, oval, with bluntly rounded anterior margin, running 

 with rounded angles in the Literal margins, covered by a brownish- 

 vellow epidermis, projecting beyoiul the sides. No trace of spire. Of 

 the generative organs the vestibule is small, the receptacular duct is 

 short, only repi"esented by a narrow part of the receptacnlum seminis, 

 which is a large oblong sac, attenuated at its distal part; the penis 

 is swollen in its proximal part, contracted at its entrance in the 

 vestibule, distally it is hooked on one side, with a blunt point at the 

 other side, where the vas deferens ends it is rounded, below the hook- 

 like top a rather long retractile muscle is inserted; the free oviduct 

 is ratlier long, more distally with a swollen vagiiud part, again 

 attenuated towards tlie vestibule ; the dart-sac is oblong, roundedly 

 attenuated towards its distal, strongly attenuated towards its proximal 

 end, no retractor muscle visible. Dart, unfortunately broken, con- 

 sisting of a slender calcareous rod, with a broad base; the point is 

 wanting. 



Type-specimen in my collection, cotypes in the Leyden Museum. 



As 1 could not identify this species with any of the described ones, 

 I asked the advice of Mr. Collinge, who had the kindness not only to 

 examine it for me, but to make a dissection and to send a sketch or 

 drawing of the generative organs, adding that it was a new species- 

 of Microparmarion on account of its dart. The shell itself agrees 

 more with that of Parmarion, as well as the rather sharp keel of the 

 intestinal sac. In shell character it agrees with If. Atistent, Simr. 

 ("Ueber einige Parmarion Arten," in Weber's Zool. Ergebiiisse einer 

 Keise in Niederl. Ost Indien, p. 109). Simroth says of the shell : 

 "Die Schale ist betrachtlich starker gewolbt, als bei den vorigen 

 [M Struhelli), das Gewinde scheint viillig resorbiert zu sein." 



Collinge writes that the new species is nearly allied to M. Javanica, 

 Coll. (Ann. and Mag. Nat. Hist., ser. vir, vol. iv, p. 400, pi. viii, 

 figs. 11-19, 1899). This concerns the generative organs, for in its 

 extei'nal characters it is very different in many respects, especially by 

 its relativel}- smooth surface, which is densely set with warts in 

 2[. Javanica, and the sliell has a well-developed spire. As to the 



