66 



it is compressed by one-sixth of its breadth, a little contractcd in front, bent and attenuated 

 toward the apex; thin, brilliant, white, ahnost hyahne, with a few minute, transverse, curdy 

 streaks, but weathering to opaque. There is an opaque band round the apex. Sculpture: most 

 faint and delicate microscopic scratches on the lines of growth, with a minute transverse 

 flocculence and some vague indication of longitudinal texture in the substance of shell. The 

 mouth is large, very oblique with a smoothly rounded edge, which is sharp on the inner margin ; 

 both it and the posterior opening are oval. The apex, which is small, is split on either side 

 by a deep narrow slightly widening, smooth, clean-cut, but not perfectly regular cleft, which is 

 evidently carried down the shell as the growth of the anima! demands, for it cuts across the 

 transverse striae, as Mr Searles Wood remarks is the case with Siphodentaliuni (Dischides) 

 bifisswn. Within the opening a short, minute, longitudinal, rib-like process projects along the 

 middle of the posterior (i. e. convex curve) wall; a little farther in a thin, narrow, circular callus 

 runs round the opening. 

 Length 0,35 in. breadth at mouth 0,032; broadest 0,055; apex 0,022. (Watson). 



Distribution. Levuka Fiji 1 2_ fms. (Challenger). 



Remarks. I have compared the Siboga specimen with the type in the British Museum 

 and find no other difference but the length which in the former measures 11,5 milL, exceeding 

 by 2,75 mill. the length of the Challenger type. The greatest inflation is at a distance of about 

 5 mill. from the anterior aperture and measures in breadth 2,5 mill. 



9. Cadïihis ovalis n. sp. PI. VI, fig. 52. 



Stat. 51. Madura-bay and other localities in the southern part of Molo-strait. From 69 — 91 

 Metres. Fine grey sand; coarse sand with shells and stones. 2 Spec. 



Diagnosis. A small graceful shell, moderately curved, very slightly swollen at a 



distance of about one fourth the length of the shell, measured from 



the anterior aperture; the convex curve uninterrupted, the concave 



^-"^^ ' ^ curve with a hardly noticeable bulging. A frontal view of the concave 



curve shows a very gradual contraction from the greatest swelling 

 , , . * » j „ toward the mouth. Mouth proportionately large, with a greater 



Fig. 31. Antenor aperture and apex tl J b ^ 



al Caduius ovalis. dorso-ventral diameter. Margin on the convex side nearly straight, 



on the concave side rounded, very faintly laterally compressed. Peristome hardly oblique. Apex 

 with two lateral .slits and slightly dorso-ventrally compressed. 

 Length 9 mill., dorso-ventral diam. of aperture 0,8 mill. 



Remarks. This .shell is very like C. Belcheri and C. prionotus. The .swelling seems 

 to be a little stronger than in either of these species, and the shape of the mouth is difterent. 



*io. Cadnlus prionotus Watson. PI. III, fig. 47. 



1879. Sipliodcntalium prionotuiii Watson, Journ. Linn. Soc. Lond. XIV, p. 522. 



1885. Siphodentaliuni prionotum Watson, Chall. Rep., p. 16, pi. 2, fig. 9. 



1897. Cadulus prionotus \Nsiison. P1LSBRY& Sharp, Man. ofConch. vol. XVII, p. 146, pi. 26, fig. 74. 



