122 DENTALIUM-BATHOXIPHUS. 



double-edged scimitar), becoming blunter toward the aperture in 

 adults, besides occasionally a few slight, irregular, longitudinal 

 keels or raised strise and concentric lines of growth. Color, clear 

 white. Slit of moderate length and very broad, semicylindrical, 

 placed on the convex side. The slit cuts away about half of the 

 posterior or narrow end of the shell. Length 27 , antero-posterior 

 diam. of aperture 2, lateral diam. 1*3 mill. ; Jeffreys' type was 

 smaller, length 0'9, breadth O'l inch. 



North Atlantic, 1450-1785 fms.; West of Ireland, 1366 fms. ; 

 Bay of Biscay, 862 fms. ; Portugal, 740-1095 fms. (Jeffr.). S.-W of 

 Nantucket, 1825 fms. ; off Chesapeake Bay, etc., 1594 fms. (U. S. Fish 

 Comrn.). Yucatan Strait, 640 fms. ; near St. Vincent, 464 fms. ; off 

 Barbados, 399 fms. (Blake). Yucatan Strait, in 1060 fms., and off 

 Havana, 1024 fms. (Dr. W. H. Rush). Off Cape Florida, 193 fms. ; 

 off Sombrero Island, 450 fms. (Challenger). -2V. of Culebra Island 

 (Challenger, for D. didymum AVats.). 



D. ensiculm JEFFR., Ann. Mag. N. H. (4), xix, p. 154 (1877) ; P. 

 Z. S., 1882, p. 660, pi. 49, fig. 4. WATSON, Challenger Rep., p. 12, 

 pi. 2,-f. 2. VERRILL, Trans. Conn. Acad., vi, p. 432 (1885). DALL, 

 Blake Rep., Bull. M. C. Z., xviii, p. 428, pi. 27, f. 12 ; Bull. U. S. Nat. 

 Mus., No. 37, p. 76 ; Proc. U. S. Nat. Mus., xii, p. 294. Dentalium 

 sigsbeanum DALL, Bull. M. C. Z., ix, p. 38 (1881). D. didymum 

 WATSON, Journ. Linn. Soc. Lond., xiv, p. 517 (1879) ; Chall. Rep., p. 

 10, pi. l.f.ll. 



Easily recognized by the strongly compressed form. Comparison 

 of a full series by W. H. Dall rendered the above consolidation 

 necessary. 



Mr. Smith has placed on record (Proc. Malac. Soc. Lond., i, p. 60) 

 a list of characteristically North Atlantic mollusks, believed to have 

 been dredged by the "Challenger" at Station ] 64, off Sydney, N.S. 

 Wales, in 410 fms., including the following Scaphopods: Dentalium 

 ensiculus, D. panormitanum [_panormuwi~\ Chenu, D. capillosum 

 Jeffr., and Caduhis propinquus Sars or C. curtus Jeffr., the first two 

 positively identified, the others not absolutely certain, though prob- 

 ably correct. Taking into account the association of species of 

 other genera, it seems to us quite incredible that these forms actually 

 occurred at the Station alleged. It is far more likely that a locality 

 label became misplaced. 



