MUSEUM OF COMPARATIVE ZOOLOGY. 419 



Dentalium perlongum Dall. 



Plate XXVII. FIr. C. 



Dentalium perlongum Dall, Bull. M. C. Z., IX. p. 36, July, 1881 ; Ibid., V,, No. 6, p. 61, 

 1878; Agassiz, Three Cruises of the likke, II. p. 07, fig. 284, 1888. 



Habitat. Station 41, in 860 fins. Station 46, in 888 fms. Yucatan Strait, 

 in G4() fms. Station 33, lat. 24° 1' N., Ion. 88° 58' W., in 1568 fms. Station 32, 

 in 804 fms. Station 43, in 339 fms. Stations 162 and 163, off Guadelupe, in 

 734-769 fms., mud and sand, temperature 40°.0. Stations 226 and 228, olf 

 St. Vincent, in 424-785 fms., sand, temperature 39°.5 to 42°.5. Stations 235 

 and 236, off Bequia, in 1507 and 1591 fms., ooze, temperature 39°.0. Station 

 244, off Grenada, in 792 fms., ooze, temperature 39°.0. Also at U. S. Fish 

 Commission Station 2117, off Cape Hatteras, N. C, in 683 fms., yellow mud, 

 temperature 40°. 0, and Stations 2383, 2384, and 2398, in 227-1191 fms., mud, 

 temperature 39°. 6 to 48°.6, between the delta of the Mississippi and Cedar 

 Keys, Florida. 



This fine species has been carefully compared with all those from deep water 

 in the Jeffreys collection, and seems fully distinct from any of them. Mr. 

 Watson observes that the young resembles D. longistrorsum Sowerby in texture 

 and general appearance, but is straight; D. acutissimum Watson is stouter and 

 more curved. 



Dentalium Slum Sowerby. 



Dentalium Jilum Sowerby, Thes. Conch., p. 99, pi. ccxxv. fig. 45, 1866. Jeffreys, 



r. Z. vS. 1882, p. 660. 

 D. gracile Jeffreys, Ann Mag. Nat. Hist., July, 1870, not of Meek. 



A shell agreeing with the specimens named D. Jilum by Dr. Jeffreys in his 

 collection was dredged at Fish Commission Stations 2592, 2595, 2596, 2601, 

 2602, and 2614, off the coast of North Carolina, in 17 to 124 fms., sand. He 

 quotes it from the N. E. Atlantic and the Mediterranean, in 20-1093 fms., and 

 also from the Italian Pliocene Tertiary beds. 



Dentalium callipeplum n. s. 



Plate XXVII. Fig. 12 b. 



Shell ivory white to pale salmon color, glistening, elegantly arched, rapidly 

 increasing ; sculpture of faint girdling incremental lines, and toward the tip 

 faint longitudinal scratches, hardly discernible ; section circular, the lower edge 

 projecting a little in the adult aperture; tip entire, circular in the youngest, 

 but in the adult with a wide very shallow notch on the concave side. Anterior 

 diameter, 5.0 ; posterior diameter, 0.5 ; Ion. of shell, 61.5; height of arch above 

 the chord, 10. mm. 



