241 



Unfbrtunately both specimens are defective, the spire of the shells being wanting; as 

 they have a very fragile appearance, I was not able to observe them sufficiently, to give even 

 a provisional description, nor could I identify them with any of the known species of Stilifer 

 or Mucronalia. On account of the lobes I have located the species in the genus Stilifer. 



2. Stilifer sibogae Schepman. PI. XVII, fig. 3, 4. 



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

 1909, p. 5. 



Stat. 153. o° 3'.8 N., I30°24'.3E. Bougainville Strait. 141 M. 1 Spec. on Salmacis Dussu- 



mieri Agass. 

 Stat. 164. i°4i'.5 S., i30°47'.5 E. Near New Guinea. 32 M. 4 Spec. on Pleurechinus macu- 



latus Mort. 

 Stat. 178. 2° 40' S., I28°37'.5E. Ceram Sea. S35 M. 1 Spec. on Prionechinus sagittiger Agass. 



Shell small, oval, imperforate, white, smooth, with very fine growth-striae and traces of 

 still much finer spiral striae; whorls about 6, of which the two apical ones are mucronate and 

 in some specimens of a brown tinge, in others white (bleached?); the subsequent whorls are 

 more or less convex and separated by a deep, margined suture. Aperture broadly ovate, with 

 a sharp angle above, right margin thin, regularly arched if seen in the aperture, nearly straight 

 if seen laterally, columellar margin strongly curved, thin, running without angle into the basal 

 margin, with a thin layer of enamel on the bodywhorl. The aperture is placed very oblique 

 on the axis of the shell. No operculum. 



Long. 3 1 /,,, lat. 2 1 /,,; apert. alt. i 1 /,, lat. about i'/ t Mill. 



Though the depth on which the specimens have been caught, varies considerably. I have 

 found no reason to describe more than one species, those from Stat. 164 are smaller and have 

 white nuclear whorls, but I find no other characters to separate them; the convexity of the 

 whorls and consequently the more a less elongated shape of the shell, may depend on sex. 



Fam. Pyramidellidae. 

 Pyramidella Lamarck. 



1. Pyramidella dolabrata Linné. 



Linné. Syst. Nat. Ed. X, p. 760, N u 522. 



KlENER. Coq. Viv. Vol. IX, Pyramidella, p. 3, PI. I, fig. 2 [terebellum). 



ADAMS. Sow. Thes. Conch. Vol. II, p. 805, PI. 171, fig. 1, 2, 3. 



REEVE. Conch. Ie. Vol. XV, Pyramidella, fig. 13. 



Tryon. Man. of Conch. Vol. VIII, p. 300, PI. 72, fig. 71—74. 



CLESSIN. Martini-Chemn. Conch. Cab. Ed. II, Vol. I, Eulimidae, p. 48, PI. 11, fig. 1. 



Stat. 93. Pulu Sanguisiapo, Tawi-Tawi-islands, Sulu Archipelago. 12 M. Lithothamnion-bottom, 



sand and coral. 2 Spec. 

 Stat. 274. 5°28'.2S., I34°53'.9E. Near Aru Islands. 57 M. Sand and shells, stones. 1 Spec. 



v. Martens who quotes the species, with the name terebellum from Mauritius and Indian 



9 



SIROGA- EXPEDITIE XLIXC. i-, 



