448 



of spire and aperture agree with those of the preceding ones, the sculpture is likewise more 

 in accordance with the present genus, than with Daphnella. 



9. Pleiirotomella diibia n. sp. PI. XXX, fig. S.- 

 Stat. 178. 2°40'S., 1 28° 37'. 5 E. Ceram-sea. 835 M. Blue mud. 2 Spec. 



Shell fusiform, transparently white, thin. Whorls about 9, of which about 3 form a reddish- 

 brown nucleus, with crossed riblets. Subsequent whorls angular, the upper part excavated, with 

 remote, faint, axial plicae below the suture, nearly lacking in last whorl ; lower part with rounded, 

 more or less oblique ribs, ending above, just below the excavation, in bluntly pointed tubercles, 

 13 or 14 on last whorl, otherwise this lower part is smooth, but for numerous growth-striae 

 and a few, scarcely appreciable, spiral striae ; near the base of last whorl however and especially 

 on the rather long, narrow canal, numerous spirals make their appearance. Aperture elongately 

 ovate, with a sharp angle above, a narrow gutter-like canal below ; peristome thin (broken), 

 according to growth-lines with a wide, shallow sinus above; columellar margin rather straight, 

 with a thin layer of enamel. 



Alt. 167,, lat. 67„; apert. alt. 87,, lat. 27, Mill. 



Alt. i47o, lat. 57o; apert. alt. 775, lat. 2 Mill. 



The smallest specimen is in the best condition and has served for description, the largest 

 one has the aperture less angular, which may be caused by having been broken and repaired ; the 

 characters are not very prominent, but the species is certainly different from the former ones. 



var. ciraunstriata n. var. 



From the same locality, a heavily broken shell, with the lower half of whorls spirally 

 grooved, 7 grooves on penultimate whorl, has been dredged ; the specimen is larger, but other- 

 wise I see no differences of much importance, the more so, as the two specimens of the type 

 are even not perfectly identical ; as a large portion of last whorl is broken away, the shell 

 appears to be much more slender, but if complete, this difference would disappear for a good 

 deal, so I preferred to mention it only as a variety; the nucleus, though eroded, allows to 

 trace the characteristic sculpture; length 24 Mill. 



Spergo Dall. ? 



I. Spergo Sibogae n. sp. PI. XXX, fig. 9. 



Stat. 262. 5°53'.8S., I32°48'.8E. Near Kei-islands. 560 M. Solid bluish grey mud. i Spec. 



Shell fusiform, rather strong, yellowish-brown. Nucleus wanting, remaining whorls 9, 

 moderately convex, slightly excavated below the conspicuous but shallow suture. Sculpture 

 consisting of remote, oblique, axial ribs, conspicuous in upper whorls, fainter lower on, disap- 

 pearing on back of last whorl, forming tubercles below the excavation, which in upper whorls 

 bears short plicae, just below the suture; the lower part of whorls is crossed by very numerous 



