REPORT ON THE SCAPHOPODA. 13 



18. Dentalium tornatum, 1 Watson (PI. II. fig. 3). 



Dentalium tornatum, Watson, Prelim. Report, pt. 2, Journ. Linn. Soc. Lond., vol. xiv. p. 518. 

 July 29, 1874. Levuka, Fiji. 12 fathoms. 



Shell. — Small, narrow, very finely tapering, slightly but very equably bent, strong, 

 of a quill-like transluceney and brilliance. Sculpture: The upper part of the shell is 

 encircled by deep, close-set, slightly oblique grooves, which look as if they were turned in 

 a lathe. Farther down the shell they become shallower, and cease at last rather abruptly. 

 The flat bands of the shell-surface which part them are of variable width, and increase 

 with the growth of the shell from about 0*011 in. to twice that amount. The front part 

 of the shell is closely, minutely, obliquely striated in the line of growth, with here and 

 there a very faint depression, just suggestive of the grooves above. There is besides 

 these a faint transverse flocculence in the substance of the shell. Mouth-edge thin, not 

 contracted, very slightly oblique. The apex is abruptly broken across, and there the edge 

 of the shell is thick, and from the opening there projects a minute round pipe about 0*008 

 broad, and 0*012 long, slightly striated obliquely, abruptly broken off at the end. In 

 most of the specimens only the mere stump of this delicate tube remains. L. 0*55 in. 

 B. 0*038; apex 0*018. 



This species seems to vary a little in breadth. 



2. Siphodentalium, 2 G. O. Sars. 1859. 



Species. 



1. Siphodentaliumplatarnod.es, Wats. 5. Siphodenialium tetraschistum, Wats. 



2. Siphodenialium tytthum, Wats. 6. Siphodentalium prionotum, Wats. 



3. Siphodentalium pusittum, Wats. 7. Siphodentalium eboracense, Wats. 



4. Siphodentalium dichelum, Wats. 8. Siphodentalium honoluluen.se, Wats. 



1. Siphodentalium platamodes* Watson (PL II. fig. 4). 



Siphodentalium platamudes, Watson, Prelim. Report, pt. 2, Journ. Linn. Soc. Lond., vol. xiv. p. 519. 



Station 24. March 25, 1873. Lat. 18° 38' 30" N., long. 65° 5' 30" W. N. of 

 Culebra Island, West Indies. 390 fathoms. Pteropod ooze. 



Shell. — Small, solid, finely tapered, curved, especially toward the apex, five-sided, 

 with four sharp corners, which are nearly right angles, and one very obtuse angle along 

 the concave curve ; these all tend to disappear toward the apex, the young shell being 



1 Turned as in a lathe. 



2 Sars published this name in the form of Siphonodentalium, a " linked sweetness long drawn out." 



3 nr'ka,ra.ij.M7\c, flat-shaped. 



