•12 7 



on U[)[KM- whoils. ilisappoariiiL;' on last ono and curvctl t^rowlh lines, lower pari of whorls with 

 llat lirac, () in nuniher on penulliniale, whorl, .separated hy narrow i;roovc:s ; on tlu; base of 

 last whorl ami canal, the LTroovcs surpass the lirae in l)rea(lth; these lira(^ are waved and the 

 whole shell is crossed !))■ growth-lines, slron<j;c>r at intervals. Aperture ohlonq;, angular above, 

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

 sinus, then slii;luly protracted; coluniellar side nearl)- straight, sliL;htly concave above, a little 

 directed to the left, alono- the canal, with a thin layer of enamel, not (juite concealing the 

 lirae of siu'face. Interior of aperture, smooth, white. 



Alt. 1 6, lat. sYt; apert. alt. 77^ lat. 2 Mill. 



This species has in outline and sculpture resemblance with some species of TropJion^ 

 but the sinus leaves no doubt about its bclonoing- to the Pleiirotoiiiidae. The specimen from 

 Stat. 178 is young. 



12. Surctila biconica n. sp. PI. XXVIII, fig. 4. 



Stat. 212. 5°54'.5S., 120° 19'. 2 E. Banda-sea. 462 M. Fine grey and green mud. i Spec. 



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

 a conve.\ly 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, 14 in number on last whorl, scarcely indicated in exca- 

 vation ; the whorls are divided by a strong 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-hnes, 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. 87,, lat. 47,; apert. alt. 47^, lat. 17, Mill. 



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

 species of Stu^czLla. 



13. Surctda celebensis n. sp. PI. XXVIII, fig. 5. 



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



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

 Whorls 672, 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 strong 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- 



