427 



on upper whorls, disappearing on last one and curved growth-lines, lower part of whorls with 

 flat lirae, 6 in number on penultimate whorl, separated by narrow grooves; on the base of 

 last whorl and canal, the grooves surpass the lirae in breadth; these lirae are waved and the 

 whole shell is crossed by growth-lines, strenger at intervals. Aperture oblong, angular above, 

 with a wide canal below; peristome thin, broken ; according to growth-lines, with a shallow 

 sinus, then slightly protracted; columellar side nearly straight, slightly concave above, a little 

 directed to the left, along the canal, with a thin layer of enamel, not quite concealing the 

 lirae of surface. Interior of aperture, smooth, white. 



Alt. 16, lat. 5 3 / t ; apert. alt. 7 3 / é , lat. 2 MUI. 



This species has in outline and sculpture resemblance with some species of Trophon, 

 but the sinus leaves no doubt about its belonging to the Pleurotomidae. The specimen from 

 Stat. 1 78 is young. 



12. Surcu/a biconica n. sp. PI. XXVIII, fig. 4. 



Stat. 212. 5 54.5 S., I20° I9'.2 E. Banda-sea. 462 M. Fine grey and green mud. 1 Spec. 



Shell biconical, with short canal, rather thin, white. Whorls 8, of which about 2 form 

 a convexly whorled nucleus, which seems to be at first smooth, the second whorl being obliquely 

 costulate, postnuclear whorls separated by a conspicuous, distinctly waved suture, angular, excavated 

 above, with rather narrow axial ribs, 1 4 in number on last whorl, scarcely indicated in exca- 

 vation ; the whorls are divided by a streng keel, consisting of depressed tubercles, forming the 

 upper part of ribs, at the base of excavation; moreover there are 3 remote spirals on the 

 scarcely contracted last whorl, which, in crossing the ribs, make them beaded, and 2 or 3 

 very faint, plain ones on canal ; in the upper whorls the uppermost of these lirae is nearly 

 covered by the suture and causes the conspicuous waves, otherwise the shell is nearly smooth, 

 but for very fine growth-lines, more conspicuous in the excavation. Aperture oblong, angular 

 above, with a short open canal below; peristome thin, broken, according to growth-lines with 

 a shallow sinus above, then slightly protracted ; columellar margin nearly straight, with a thin 

 layer of enamel. 



Alt. 8 3 / 4 , lat. 4 1 /,; apert. alt. 4 1 /,, lat. i 3 /, MUI. 



This species is peculiar by its shape and sculpture. I find nothing like it amongst the 

 species of Sur ca la. 



13. Surcula celebeusis n. sp. PI. XXVIII, fig. 5. 



Stat. 88. o°34'.6N., 119° 8'. 5 E. Makassar-strait. 1301 M. Fine grey mud. 4 Spec. 



Shell small, sub-biconical, with short canal and subgradate spire, thin, subpellucid, white. 

 Whorls 6 l /„, of which nearly 2 form a smooth, shining, convexly-whorled nucleus; subsequent 

 whorls angular, excavated above, separated by a conspicuous, irregularly waved suture, with 

 a rather streng rib just below it, with short bead-like folds, lower part of whorls with oblique 

 ribs, 15 in number on last whorl, tubercled at their upper part below the excavation, more- 



63 



