EEPORT ON THE SCAPHOPODA. 17 



7. Siphodentalium eboracense, Watson (PI. II. fig. 10). 



Siphodentalium eboracense, Watson, Prelim. Eeport, pt. 2, Journ. Linn. Soc. Lond., vol. siv. p. 523. 



September, 7, 1874. Torres Strait, Cape York, N.E. Australia. 3-11 fathoms. 



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 in. apart), sharp and regular, 

 but which seem very easily rubbed off, 1 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. L. 0*185 in. B. 0*024 ; at apex, 0*008. 



Than Siphodentalium prionotum, Wats., this is smaller, straighter, but toward the apex more bent, 

 not narrowed at the mouth ; smaller at the apex, and the whole texture of the shell is different. 



Than Sipliodentalium vitreum, Sars, this is less cylindrical, is not contracted toward the mouth, 

 and is much smaller toward the apex. 



8. Siphodentalium honoluluense, Watson (PL II. fig. 11). 



Siphodentalium honoluluense, Watson, Prelim. Report, pt. 5, Journ. Linn. Soc. Lond., vol. xv. p. 89. 



July 1875. Eeefs off Honolulu. 40 fathoms. 



Shell. — Cylindrical, bent and attenuated from about the middle to the apex, toward 

 the mouth very slightly contracted ; of a dull white translucency, and not glossy. Sculp- 

 ture : The surface, especially toward the apex, is faintly marked by microscopic, remote, 

 oblique, raised, encircling rings, parallel to which there are fine scratches in the intervals. 

 Edge of the mouth very oblique, blunt. Apex not small, broken. Length 0*21 ; breadth, 

 greatest 0*031 ; at mouth 0*028 ; at apex 0*0 16. 



This species closely resembles Siphodentalium tetraschistum, Wats. ; but, besides the obvious 

 difference in size, that species is a little more cylindrical and is much more strongly and uniformly 

 sculptured. I say nothing of the peculiar feature of the apex of that species, because, the point 

 being broken in the solitary specimen of the present species, comparison is impossible. 



1 On two specimens they are barely traceable. 



(ZOOL. CHALL. EXP. — PART XUI. 1885.) Tt 3 



