DENTALIUM-FISSIDENTALIUM. 77 



merated. All the specimens were dead, discolored, and occupied by 



annelid tenants (Dall). 



D. CAPILLOSUM Jeffreys. PL 8, figs. 31, 32, 33, 34, 35. 



Shell very slightly curved, solid and strong, white under a dull 

 gray-brown deposit, lusterless. Sculpture of fine, even, rounded lon- 

 gitudinal threads, separated by narrow grooves, and roughened by 

 close, rather irregular impressed growth- lines ; the threads about 65 

 in number toward the aperture, most of them continuing to the anal 

 end, varying somewhat in width, but remarkably uniform in appear- 

 ance. Aperture circular, somewhat oblique, thin-edged. Anal ori- 

 fice nearly round ; slit rather narrow and short, on the convex side. 

 Length 81, diam. of aperture 8*6, of apex 1/6 mill. ; length of slit 

 3 mill. 



Whole North Atlantic, 208-1785 fms. (Valorous, Porcupine) ; off 

 Bahia Honda, 418 fms. ; Bay of Biscay, 882 fms. ; N. of Hebrides, 

 542 fms. ; Coast of Portugal, 220-1095 fms. ; W. of Azores and off 

 San Miguel, 1000 fms. ; Setubal, 470 fms. ; off Culebra L, W. Indies, 

 390 fms. (Challenger) ; off Havana, 119 fms.; off Martinique, 169 

 fms. ; near Santa Lucia, 116 fms. (Blake) ; Barbados, 100 fms. 

 (Hassler Exped.). 



D. capillosum JEFFR., " Valorous " Kep., Proc. Koy. Soc., xxv, 

 1876, pp. 185, 191 (name only); Ann. Mag. N. H. (4), xix, 1877, 

 p. 153 ; Ibid (5), vi, p. 375, (1880) ; P. Z. S., 1882, p. 658, pi. 49, 

 f. 1. WATSON, Challenger Rep., p. 1, pi. 1, f. 1. DALL, Blake 

 Moll., Bull. M. C. Z., xviii, p. 425 ; Bull. U. S. Nat. Mus., no. 37, 

 p. 76 (1889). 



The above diagnosis and fig. 33 are from specimens dredged near 

 Graciosa, Azores, in 800 fms. 



Jeffreys described this species from a young specimen as follows : 

 D. capillosum Jeffreys, (PL 8, figs. 31, 32). Shell tapering to a 

 fine point, slightly curved, rather solid, opaque, and mostly luster- 

 less. Sculpture, numerous and sharp (not rounded) longitudinal 

 striae, some of which are intermediate and smaller than the rest ; 

 they disappear toward the posterior or narrow end, which is quite 

 smooth and glossy for one-quarter of an inch ; color whitish ; mar- 

 gin at the posterior end having a short and narrow notch; length 

 1-4 inch, breadth 0'15 inch. (Jeffreys, 1877). 



Dr. Gwyn Jeffreys has described the ribs as "sharp (not rounded)." 

 They rather seem to be sharply cut, but they are rounded on the 



