429 



Pleurotoma s. str., as figured by Troschel; as ihe radula of only few species is known, I think 

 the characters of the shell may provisionally decide. 



Clavosurcula n. gen. 



Shell clavate, with a very broad body and long, slender canal, according to growth- 

 striae with a wide, deep sinus, occupying nearly the vvhole breadth of upper whorls-, nucleus 

 smooth, swollen ; operculum wanting. 



Type : Clavosurcula Sibogae n. sp. 



I could not refer this specimen to any known genus, its peculiar shape, which reminds 

 that of Steiraxis Dall., is still too much different to locate it in that genus. In some degree 

 it seems to be allied to Surcula, and so I have provisionally located it near that genus; unfor- 

 tunately the operculum and soft parts are wanting; though the shell has the appearance of 

 being not adult, it is too remarkable to neglect it. 



i. Clavosurcula Sibogae n. sp. PI. XXVIII, fig. 7. 



Stat. 45. 7°24'S., iiS°I5'.2E. Flores-sea. 794 M. Fine grey mud with some radiolariae and 

 diatomes. 1 Spec. 



Shell clavate, with convex spire, attenuated towards the apex, with long, slender canal, 

 thin, pellucid, white. Whorls 8, of which about i 1 /., form a smooth, swollen nucleus, post-nuclear 

 whorls keeled, the keel running in the 2 uppermost post-nuclear whorls a trifle above the 

 linear suture, in the following whorls it is coalescing with the suture, on the last whorl it has the 

 appearance of a blunt, rounded rib, with a slight groove above it; the upper whorls are nearly 

 straight, the last 2 ones slightly convex, last whorl rapidly contracted below the keel. Sculpture 

 consisting of numerous raised spiral striae, rather fine in upper part of whorls, very fine on a 

 narrow zone just above the keel, coarser on the keel, much coarser on the basal part of last 

 whorl and on the canal, which is long and slender. Aperture rhomboid, with a moderately 

 sharp angle above and an obtuse angle at the keel; peristome thin, broken, according to 

 growthdines with a wide, deep sinus above, then strongly protracted. Columellar margin nearly 

 straight above, along the body-whorl, then concave, upper part at the canal straight, then 

 strongly contorted to the left, with a thin layer of enamel, stronger at upper part of canal; 

 interior of aperture smooth, but apparently striated by the transparency of the shell. 



Alt. 38, lat. 20 ; apert. alt. 16, lat. 7 1 /, Mill. 



Mangilia Risso. 



1. lïlangilia terpnisma Melvill & Standen. 



Melvill & Standen. Proc. Zool. Soc. Lond. 1901, p. 443, PI. 24, fig. 8. 



Stat. 114. Kwandang-bay-entrance. 75 M. Hard sand very fine. 2 Spec. 

 Stat. 193. Sanana-bay, East coast of Sula Besi. 22 M. Mud. 1 Spec. 



Stat. 285. Near South coast of Timor. 34 M. Limit between mud and coral, Lithothamnion. 

 1 Spec. 



The specimens vary in size but agree in shape, sculpture and colour-markings. 



65 



S1BOGA-EXPEDITIE XI.IX 1 !'. 5^ 



