MUSEUM OF COMPARATIVE ZOOLOGY. 421 



b. Shell striated. 



Dentalium leptum Bush. 



Dentalium leptum Bush, Trans. Conn. Acad., VI. p. 470, pi. xlv. figs. 18, 18 a, 1885 ; 

 Kep. U. S. Fish Commission for 1883, p. 85, 1885. 



This beautiful and distinct species is reported from the vicinity of Cape Hat- 

 teras, N. C, to Charlotte Harbor, Florida, in 2 to 50 fms., sand or mud. It is 

 readily recognized by its orange tint and slender form, delicately and closely 

 striated near the tip. 



Dentalium antillarum Orbigny. 



Dentalium antillarum Orb., Moll. Cuba, II. p. 202, pi. xxv. figs. 10-13, 1842. Dall, 

 Bull. M. C. Z., IX. p. 37, 1881. 



Habitat. Station 20, in 220 fms. ; Barbados, in 100 fms. ; Yucatan Strait, in 

 640 fms.; Station 44, in 539 fms. ; Station 19, in 310 fms.; Station 43, in 339 

 fms. ; Station 33, in 1568 fms. ; off Cape San Antonio, in 1002 fms. ; off Havana, 

 in 80 to 400 fms., Sigsbee; Station 136, near Santa Cruz, in 508 fms., ooze, 

 temperature 42°.5 ; Station 176, off Dominica, in 391 fms., ooze, temperature 

 43°.5 ; Station 211, off Martinique, in 357 fms., sand ; Station 230, near St. 

 Vincent, in 464 fms., temperature 41°. 5 ; Station 264, off Grenada, in 416 

 fms., ooze, temperature 42°.5 ; Stations 272, 282, and 300, near Barbados, in 76 

 to 154 fms. sand, temperature 56° to 65°. Also by the U. S. Fish Commission 

 at Station 2355, near the Arrowsmith Bank, Yucatan, in 400 fms., ooze ; and at 

 Station 2616, twenty-five miles E. S. E. from Cape Fear, N. C, in 17 fms., 

 sand. Also by Dr. W. H. Rush, U. S. N., off Cape Hatteras, in 300 fms., green 

 mud. 



This well marked species is uniformly finely grooved from the tip to the 

 anterior part, the interspaces being rounded, subequal, and thread-like, grow- 

 ing slightly finer anteriorly. The section is circular, the notch is on the 

 convex side, shallow and wide, often decollate. I believe its range extends 

 north to New England, and possibly to Nova Scotia, in deep water, judging by 

 specimens so labelled in the National Museum. 



Dentalium calamus n. s. 



Shell very slender, slightly arched, white, translucent, the soft parts showing 

 through the shell; finely longitudinally grooved, the grooves uniform, the 

 interspaces flat and slightly wider anteriorly; aperture hardly oblique, anal 

 end apparently trimmed off obliquely for a short distance on the convex side, 

 glandiform, phallic, vertically narrowly slit, the slit longer on the convex side, 

 the "glans"-like portion smooth, polished, usually with a little ledge around 

 it. Lon. of shell, 19.5 ; height of arch from chord, 2.25 ; diameter of aperture, 



