64 



R e m a r k s. Compared to mediocarinata, cornucopiae increases more rapidly in diameter 

 and the incurved side is not so angular as in that species. 



Genus Siphonodentalium AI. Sars 1859. 



1859. Siphonodentalium M. Sars, Forh. Videnskabs Selskabet in Christiania p. 52. 

 1861. Siphonodentalium M. Sars, Om Siphonodentalium vitreum en ny Slaegt og Art of 

 Dentalidernes Familie. 

 ? Siphonodentalium M. Sars. G. O. Sars, Moll. Reg. Arct. Norv., p. 103. 

 1897. Siphonodentalium M. Sars. PiLSBRV & Sharp, Man. of Conch., vol. XVII, p. 135. 

 Siphodcntalium Monterosato, Jeftreys and Watson. 



Shell an arcuate, sli.^htly tapering tube, largest at the aperture, circular or nearly so in 

 section, and smooth externally. Apex rather large, typically slit into lobes, but sometimes simple. 

 Foot capable of expanding into a terminal disk. Type S. vitreum Sars. 



6. SipJionodentalium aiistralasiae n. sp. PI. VI, iïg. 68. 



Stat. 211. 5°40'.7S., I20°45'.5 E. Banda Sea. 1158 Metres. Coarse grey mud, superficial layer 



more liquid and brown. i Spec. 



Diagnosis. Shell at the top, between inner and outer curve very slightly compressed, 

 cylindric at aperture, smooth and glossy, very fragile and transparent with many obliquely 

 encircling opaque bands, crossed near the aperture by extremely faint longitudinal opaque bands; 

 moderately arcuate. Apex simple, large. Anterior aperture wide, subcircular, the margin on the 

 inner curve less rounded than on the outer curve. 

 Length 18 milL, diam. of apert. 2,5 milL, diam. of apex 1,3 mill. 



Remarks. In ontward appearance rather like the well-knowm Sipho7iodcntaluun vitretim 

 Sars (PiLSBRY, p. 136, pi. 23, figs 8 — 21), but the diameter increases less rapidly and it is not so 

 strongly curved. The apex of S. vitretim is cut into six lobes or teeth, and that of aiistralasiae 

 shows some irregularities which perhaps indicate a similar kind of apex, but it is too imperfect 

 for stating this with certainty. The radula of mistralasiae offers no difterences to that of vitreum^ 

 described by Sars. 



*7. Siphonodentalittm eboracense Watson. PI. III, fig. 44. 



1872. Siphodentaliuin eboracense Watson, Journal Linn. Soc. Lond. XIV, p. 523. 

 1885. Siphodentalium eboracense Watson, Challenger Report, p. 17, pi. 2, fig. 10. 

 1897. Siphonodentalium eboracense Watson. PiLSBRY & Sharp, Man. of Conch. vol. XVII, 

 p. 140, pi. 26, fig. 75. 



Diagnosis. Shell small, narrow, tapering very gradually throughout, toward the apex bent, 

 thin, brilliant, translucent, and transparent in alternate bands. Sculpture: there are a few remote, 

 irregular oblique, transverse striae-, in the young shell the whole surface is covered with longitudinal 

 striae; excessively minute (0,0005 ■"• apart), sharp and regular, but which seem very easily rubbed 

 off (on two specimens they are barely traceable), and which disappear towards the mouth. The 

 mouth is round, very oblique, sharp and thin. The apex is minute, and is broken straight across, 

 and somewhat chipped. Length 0,185 inch., breadth 0,024; at apex o.ooS inch. (Watson). 



