DENTALIUM-FISSIDENTALIUM. 77 



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

 annelid tenants (Dall). 

 D. CAPiLLOsuM Jeffreys. PI. 8, figs. 31, 32, 33, 34, 35. 



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

 gray-brown deposit, lusterless. Sculpture oi fine, even, ro^mded 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 ^'Q, of apex 1*6 mill. ; length of slit 

 3 mill. 



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

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

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

 San Miguel, 1000 fms. ; Setubal, 470 fms. ; off Culebral., 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 " Rep., Proc. Roy. 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. 



Jeflfreys described this species from a young specimen as follows : 

 D. capillosum Jeffreys, (PI. 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 

 strise, 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 015 inch. (Jeflreys, 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 



