EAST AMERICAN SCAPHOPOD MOLLUSKS. 



85 



(?)1901. Dentaliuin filam, Dall and Simpsont, U. S. Fi^h Coxmn. Bulletin for 



1900, vol. 1, p. 456. 

 1903. Dentaliumophiodon Dall, Bull. 37, U. S. Nat. Mus., p. 7G, pi. 26, fig. 9. 



The shell is small, evenly and considerably curved, slowly taper- 

 ing, markedly compressed on the convex and concave sides, but not 

 to the extent shown in Dentalimn pressum; the lateral edges are not 

 angulated even bluntly; the compression is greatest just back of 

 the anterior aperture, which often appears to be somewhat con- 

 stricted. It is thin but strong, of white color, glossy but not highly 

 polished. A sculptural feature of ''faint, irregular longitudinal 

 striations" are given by the author, but I have never been able 

 to detect these. Growth lines more clearly seen by aid of a lens, 

 arch forward on the concave side. The entire surface is smooth but 

 not polished. The apical orifice is simple, having neither notch nor 

 slit. Measurements are: 



Length, 15.5 mm.; greater diameter, 1.75 mm.; lesser diameter, 

 1.5 mm. (Pilsbry). 



Length, 12.5 mm.; greater diameter, 1.33 mm. (Dall). 

 Length, 14.5 mm.; greater diameter, 1.25 mm.; lesser diameter, 

 1 mm., arc 1.5 (type). 



The type. Cat. No. 95344, U. S. N. M., obtained by the Blake at 

 United States Coast Survey Station 21, off Bahia Honda, Cuba, in 

 287 fathoms; no further data given. 



This is an Antillean species of the continental slope zone. It is 

 readily distinguished from Dentalium pressum by its smaller size and 

 lesser degree of compression. A young specimen from Mayaguez, 

 Porto Rico, Cat. No 161576, taken in 25 fathoms, is possibly D. 

 ophiodon. 



The following lots are in the museum collection: 



Num- 

 ber of 

 speci- 

 mens. 



Cat. No. 

 U.S.N.M, 



95345 

 314580 

 314581 

 314582 

 314583 

 314584 

 314585 

 314586 

 314587 



314588 



314589 

 314590 

 323812 



95344 

 95346 

 314832 

 3148.33 

 314834 

 314835 



Locality. 



Off Bahia Honda, Cuba, U. S. C. S. Station 21... 



Off Fowey Light, Florida, Eolis Station 305 



Off Fowey Light, Florida, Eolis Station 364 



Off Fowey Light, Florida, Eolis Station 361 



Off Fowey Light, Florida, Eolis Station 373 



Off Fowey Light, Florida, Eolis Station 375 



Caesar's Creek, Florida, Eolis Station 376 



Off Ragged Key, Florida, Eolis Station 366. .. . . . 



Ofl Western Dry Rocks, Florida, Eolis Station 



319 

 Off Western Dry Rocks, Florida, Eolis Station 



320 



Off Key West, Florida, Eolis Station 333 



Off Key West, Florida, Eolis Station 146 .. ... . - . 



OfT Cape San Bias, Florida, U. S. B. F. Station 



Off Bahia Honda, Cuba, U. S. C. S. Station 20.. 

 on Barbados, Hassler 



Barbados, S. U. I. Station. ....-.---■- .-•■.•-■-■■ 

 Barbados off Pcli-an Island, S.U- 1- Station 62 

 Off Fernandiua, Florida, U. S. B. F. Station 2668 

 Off Lazaretto, Barbados, S. U. L Exped. Station 

 38. 



1 Type. 



Remarks. 



287 fms. 

 110 fms. 

 75-90 fms. 

 75-100 fms. 

 70-90 fms. 

 75-90 fms. 

 90 fms. 

 75-90 fms. 

 90 fms. 



80 fms. 



110 fms. 

 98 fms. 

 169fms.,gy. m. 



220 fms. 



110 fms. 



(deep). 



125 fms. 



294 fms., gv. s. dd. CO., 46.3 



130-140 fms., sd. 



