439 



The Siboga-specimen is slightly more ventricose than a Gulf of Oman-specimen, which 

 Mr. Melvill kindly sent me for comparison ; the sculpture seems to be a little stronger, the 

 outer lip is more developed; this latter may depend on age, otherwise the shell is so much 

 the same, that its differences may be individual, so I have not applied a varietal name to this 

 unique specimen. 



4. Clathurella jap07iica Melvill. 



Melvill. Proc. Mal. Soc. Lond. Vol. I, 1895, p. 227, PI. 14, fig. n. 



Stat. 51. Madura-bay. 69 — 91 M. Fine grey sand, coarse sand with shells and stones. 1 Spec. 



The specimen has the peristome not developed. Mr. Melvill, to whom I owe the iden- 

 tification of this doubtful specimen, says that it seems to agree in all essential features. 



5. Clathurella virgo n. sp. PI. XXIX, fig. 5. 



Stat. 100. 6°u'N., 120 37'. S E. Sulu-archipelago. 450 M. Dead coral. 1 Spec. 



Shell ovate, with short canal, thin, pellucid, white. Whorls 6, of which 2 convex ones 

 form the nucleus, which is microscopically, spirally lirate and crossed by still finer axial striae, 

 which make the apex cancellated; post-nuclear whorls very convex, separated by a deep suture, 

 accompanied by an excavation of the upper part of whorls. Sculpture consisting of rounded 

 axial ribs, narrower than the interstices, 19 in number on last whorl, ending at the excavation, 

 not reaching the base of last whorl, and rather sharp, spiral lirae, 10 in number on penultimate 

 whorl, besides a few much fainter ones in the excavation ; moreover very fine growth-lines, 

 stronger in the excavation and extremely fine granules, cover the whole shell. Aperture oval, 

 angular above, below with a short, wide canal ; peristome thin, with a rather shallow sinus, 

 columellar margin concave above, directed to the left along the canal, covered with a thin 

 layer of enamel ; interior of aperture smooth. 



Alt. 7 3 /„ lat. 4; apert. alt. ^\ v lat. i l / 2 Mill. 



This fine species has no conspicuous features, it is a typical deepwater form, the sculp- 

 ture of the apex however is peculiar. 



6. Clathurella r:tfoapicata n. sp. PI. XXIX, fig. 6. 



Stat. 17S. 2°4o'S., I28°37'.5E. Ceram-sea. 835 M. Blue mud. 1 Spec. 



Shell ovate, with short canal, thin, pellucid, white, with rufous apex. Whorls about y l j it 

 (uppermost top damaged) of which about 3 1 /. form the rufous nucleus, which is angular by a 

 strong keel, and crossed by axial riblets; post-nuclear whorls very convex, with a deep suture 

 and an excavation below it; sculpture consisting of rounded, axial ribs, narrower than the interstices, 

 1 8 in number on last whorl, ending at the excavation and disappearing on base of last whorl, 

 and spiral lirae, of which 4 principal ones on penultimate whorl, which make the ribs slightly 

 tubercled, and a few finer ones in the excavation and in many of the interstices; moreover fine 



75 



