84 



BULLETIN 111^ UNITED STATES NATIONAL MUSEUM. 



1SS9. Dentalium compressum, Dall, Bull. Mus. Comp. Zool., vol. 18, p. 42G. 



18S9. Dentalium compressum, Dall, Bull. 37, U. S. Nat. Mus., p. 76. 



1897. Dentalium (Compremdens) pressum, Pilsbry and Sharp, Tryon's Man. 



Conch., vol. 17, p. 124, pi. 7, fig. 11; pi. 22, figs. 50-52. 

 1903. Dentalium compressum, Dall, Bull. 37, U. S. Nat. Mus., p. 76. 



The shell is strongly compressed or flattened on both the convex 

 and concave sides; the lateral sides are not actually carinated but 

 subangular. There is no contraction at the anterior aperture. It 

 is moderately and regularly curved, rather quickly increasing in 

 girth, thin but strong, and with an oval section. The color is white, 

 with surface scarcely shining, the shell varying from translucent to 

 rather opaque. Some faint longitudinal wrinkles are sometimes 

 observable on the tip with shallow spaces between; irregular, densely 

 crowded growth lines encircle the shell, coarsening the otherwise 

 smooth surface. No apical notch or slit is present. Measurements 

 are: 



Length, 12 mm.; greater diameter, 2 mm.; lesser diameter, 1.75 

 mm. (Pilsbry). 



Length, 11.25 mm.; greater diameter, 1.5 mm.; lesser diameter, 

 1.25 mm. (type). 



Length, 17 mm.; greater diameter, 2 mm.; lesser diameter, 1.5 

 mm. (Tortugas). 



This is an antillean continental slope species, reaching north to 

 the Florida Keys region within the Gulf Stream. The type is from 

 off Culebra Island, West Indies, in 390 fathoms, dredged by the 

 Challenger. 



The followinor lots are in the museum collection: 



Locality. 



Remarks. 



I-'owey Light, Florida, Eolis Station 303 135 fms. 



Fowey Light, Florida, Eolis Station 306 100 fms. 



Off Cape Florida, U. S. B. F. Station 2644 i 193 fms., gy. s., 43.4° 



Fowey Li^ht, Florida, Eolis Station 349 100-150 fms. 



Fowey Light, Florida, Eolis Station 348 110 fms. 



Between Mississippi Delta and Cedar Keys, U.S. Ill fms., 97m. 

 B. F. Station 2402. 



Off Cape San Bias, Cedar Keys, U. S. B. F. Sta- 

 tion 2399. 



South of Tortugas, B/afce Station 43 \ :139 fms., 45°. 



Off Cape San Antonio, Station 43 1 U3 fms. 



Femandina, Florida, U. S. B. F. Station 266S | 94 fms., 46.3° gy. s. dd. co. 



196 fms., gy. m.,51.6*. 



DENTALIUM (COMPRESSIDENS) OPHIODON Dall. 



Plate 14, fig. 2. 



1881. Dentalium ophiodon Dall, Bull. Mus. Comp. Zool., vol. 9. p. 38. 



1889. Dentalium ophiodon Dall, Bull. Mus. Comp. Zool., vol. 18, p. 427, pi. 26, 



fig. 9. 

 1889. Dentalium ophiodon Dall, Bull. 37, U. S. Nat. Mus., p. 76, pi. 26, fig. 9. 

 1897. Dentalium ophiodon, Pilsbry and Sharp, Tryon's Man. Conch., vol. 17, p. 



126, pi. 7, fig. 13; pi. 22, figs. 61, 62. 



