4°5 



perhaps rubbed off on the nodules themselves. Below the keel the last whorl is very convex, 

 but soon contracted and passes into a slender, moderately long canal ; the whole lower part of 

 this whorl is lirate, irregularly on body, where 2 lirae are stronger, more regularly on canal ; total 

 number of these lirae about 35, but on base of tail too faint to be properly counted; moreover 

 a few narrow intermediate ones below periphery, and the whole shell exhibits very fine growth- 

 striae. The nodules on the keel are rounded, slightly compressed, not very numerous, 24 on last 

 whorl. Aperture triangular with an angle above and at the keel ; interior of aperture white, 

 smooth, columellar side enamelled, peristome thin, broken. 



Alt. 27Y0, lat. n 3 /.],; apert. alt. with canal i4 s / 4 , lat. 4 l j„ Mill. 



It is not without some hesitation that I describe this new species on a probably incom- 

 plete specimen, but as the number of species in the section to which it belongs is not over- 

 whelming, I think it may afterwards be recognizable if adult specimens are captured. lts nearest 

 ally may be P. carinata Gray, as defined by Smith (Ann. and Mag. Nat. Hist., Ser. 6, 

 Vol. XVIII, 1896, p. 368), which should be the same as P. spcciosa of Reeve, Weinkaüff and 

 Tryon. It differs-by the large number of spirals, of which there are but from 1 to 3 in Gray's 

 figure, on Plate 23 of his "Mollusca" in the "Animal Kingdom", Vol. XII, though the peristome 

 of that figure seems to indicate a larger number of lirae. In Reeve's figure (Conch. Ie. fig. 9) 

 the number of keels is likewise much smaller, on the contrary the nodules of keel are much 

 more numerous than in the new species, the same is the case with Weinkauff's figures (Jahrb. 

 Deutsche Mal. Gesellsch. 1875, pi. 9, fig. 2, and Martini-Chemn. Conch. Cab. Ed. II, PI. 15, fig. 5). 



Dolichotoma Bellardi. 

 1. Dolichotoma atractoides Watson. 



WATSON. Journ. Linn. Soc. Lond. Vol. XV, 188 1, p. 407. 



WATSON. Voy. Challenger, Gasterop. p. 301, PI. 20, fig. 8. 



SOWERBY. Proc. Mal. Soc. Lond. Vol. I, 1893, p. 38. 



BOETTGER. Nachrichtsbl. Deutsche Mal. Gesellsch. 1895, p. 6. 



V. MARTENS. Die beschalten Gastrop. d. deutsch. Tiefsee-Exp. 1S98 — 1S99, 1903, p. 86, 87, 



PI. 1, fig. 12, 15. 

 Smith. Ann. and Mag. Nat. Hist. Ser. 7, Vol. XIII, 1904, p. 459. 



Stat. 300. io°48'.6S., I23°23'.i E. Timor-sea. 918 M. Fine grey mud. 1 Spec. 



The only specimen is very fine and large, its length is 63 Mill., though the nuclear 

 whorls are not intact, its breadth is 29 Mill.; these measurements surpass by far those of 

 Watson's specimen (1.4X0.53 in.), that of Smith (47X20 Mill.) and of von Martens' var. 

 aethiopica (37 X 14 Mill.), the var. obsolescens v. Marts. being still larger (67X22 Mill.) if the 

 text is correct, the line accompanying the figure is only 57 Mill. and the figure of 72 Mill. 

 has a breadth of 32 Mill. The Siboga-specimen contains the soft parts, however in too much 

 contracted state, to say much about them. I see a thick siphon, strong tentacles, the foot is 

 rounded posteriorly and bears a comparatively small, corneous, thick, oval, concave operculum, 

 with the nucleus at the right side, its length is about 5 1 /,,, its breadth 3 ] / 3 Mill. 



41 



SIBOGA-EXPEDITIE XLIX'c. 53 



