140 SIPHONODENTALIUM. 



S. AFFINE M. Bars. PI. 24, figs. 45, 46, 47. 



Shell thin, very pellucid, shining, very smooth, the growth strise 

 but slightly visible; cylindric, slightly subarcuate, a little tapering 

 toward the apex ; aperture about twice the width of the apex, which 

 is circular with entire margin. Length 4 mill. ((?. 0. Bars'). 



Finmark and Lofoten Is., 100-300 fms. (Sars) ; West of Ireland, 

 1215-1380 fms., and Channel slope, 690 fms. (Porcupine) ; Bedford 

 Basin, near Halifax, Nova Scotia, in 35 fms. (Verrill). 



Siphonodentalium affine M. SARS, Forh. Videns. Selskabet Christ- 

 iania for 1864, p. 300, pi. 6, f. 34, 35 (I8Q5).Siphodentalium affine 

 M. Sars, JEFFREYS, Ann. Mag. N. H. (4), xix, p. 156 (1877) ; 

 P. Z. S., 1882, p. QQl.Siphonentalis affinis M. Sars, G. O. SARS, 

 Moll. Reg. Arct. Norv., p. 104, pi. 20, f. 12 (1878). VERRILL, 

 Proc. U. S. Nat. Mus., iii, p. 395; Trans. Conn. Acad., v, p. 558, 

 pi. 42, f. 20rt, b. 



Not the young of S. vitreum \lobatum~], which in all stages of 

 growth is more conical and not so cylindrical as S. affine; and the 

 point is also different. The present species is not half the size of S. 

 teres, and is much less slender and tapering. (Jeffreys). 



S. PUSILLUM Watson. PI. 23, fig. 6. 



Shell minute, attenuated, slightly bent, thin, transparent, irregu- 

 larly banded with opaque white, which runs elliptically round the 

 shell. Sculpture : there is no trace of longitudinal strise, but the 

 whole surface is sharply scratched with minute transverse strise, 

 which run (as usual) not directly round the shell, but advance on 

 the concave and retreat on the convex curve. Length 0'12 inch., 

 breadth at small end O'Ol ; at broad end 0'02. ( Watson). 



Palma, Canaries, 1125 fms. (Challenger). 



Siphodentalium pusillum WATS., Journ. Linn. Soc. Lond., xiv, 

 p. 520 (1879) ; Chall. Rep., p. 14, pi. 2, f. 6. 



The specimens are young, and both ends are chipped. It is 

 straighter and more tumid than Dentalium filum Sow. (in part),= 

 Dentalium gracile Jeffr., but more curved and broader than the 

 young of D. capillosum Jeffr. It is much larger, more tumid, and 

 straighter for the same length than Siphodentalium lofotense Sars. 

 ( Watson). 

 S. EBORACENSE Watson. PI. 26, fig. 75. 



Shell small, narrow, tapering very gradually throughout, toward 

 the apex bent, thin, brilliant, translucent, and transparent in alter- 



