.. l.it. i ( ; apert. alt. i Mill. 



This resemblance with the preceding one, but is much more slender, 



it is nol the juvi ate, for it should never reach the breadth of thai species, if it proved 



to be thi this would be an extraordinary case of dimorphism in Mollusca; only the 



that it has been found on the same animal, is a reason to be cautious. Mucronalia 



■ ':■'.'.. Proc. Mal. Soc. Lond. VI, p. 163, fig. 13) is also a specii similar by lts size 



ape, but with cylindrical whorls. 



Mucronalia varicosa Schepman. PI. Wil. fig. 2. 



SCHEPMAN, in Schepman Cs: Nierstrasz. Parasit. Prosobranch. d. Siboga-Expedition, Leiden, 



•• 4- 



i' ;. i :.'.;>.. i30°47.5 1-".. War New Guinea. 32 M. 2 Spec. on Astrochalcis tubercu- 

 losns Koehler, 1 loosened <>ne and 4 specimens without exact Locality, perhaps 

 from the same station. 



Shell small. oval, imperforate, white, rather smooth, with very line growth-striae and a few 

 rihlike varices on the last whorl. Whorls aboul <>. of which the two apical ones are mucronate, 

 the other whorls are convex with a deep marginate suture. Aperture subovate, its upper angle 

 moderatel) acute, right margin thin, slightly expanded, regularly flexuous, stronger so near the 

 upper part, columellar side slightly arched, a little thickened near the base, with a thin layer 

 namel on the bodywhorl. < >perculum thin. horny. 



Long. 4. lal. :' .. to 2 ,; apert. alt. 2 1 / i Mill. 



The species varies slightly in shape, some specimens being more swollen than others, 

 which may depend on sex; the varixlike striae on the last whorl are remarkable, they remind 

 thos< "t Stilifer variciferus Hedlcy (Mem. Austral. Museum, Vol. III. p. 411. fig. 5), but that 

 is quite another shell, belonging to the section of exaratus. These varices probably result of 

 former margins, which by being expanded, caused these rihlike processes. 



After this description was written I found a fine specimen from Stat. 164. amongsl the 

 Eulimidae, hut this was loosened and consequently not immediately recognizcd as a parasite, 

 lts length is ~, [ ., : Mill. and it has the varices very wel! developed. 



Stilifer Broderip. 



The description of the soft parts or animal of Stilifer are rather different from each 

 other; if one compares the description of Stilifer Turtoni Brod. by Jeffreys (British Concho- 

 logy, Vol. I\'. ]). 195) and bis figures of the animal (1. c. PI. 3, fig. 2), with that of Stilifer 

 celebensis Kükenthal (Abh. Senckenb. Gesellsch. band 24, [898, p. 6, PI. 1, fig. 6; PI. 3. lig. 16) 

 one would ly think that the authors deal with the same gfenus. 



&' 



1. Stilifer sp. 



S' HEPMAN, in Schepman & Nierstrasz. Parasit, Prosobranch. d. Siboga-Expedition, Leiden, 



Stat. 300. 1 ■ . 1 E. Timor Sea. 918 M. 2 Spec. <>n Aspidodiadema tonsum A 



8 



