426 



BULLETIN OF THE 



in 169 fms. Station 220, near Santa Lucia, in 116 fms. Barbados, Hassler 

 Expedition, in 100 fms. 



All the specimens were dead or fragmentary, and most of them belong to 

 the variety paucicostatum Watson. In examining the specimens named D. capil- 

 losum in the Jeffreys collection, I find several of them which he regarded as the 

 young to be of a more slender and much smaller species, which probably never 

 attains a large size, though sculptured like D. capillosum. The specimen figured 

 in the P. Z. S. above cited is only about one third the size of an adult. 



Dentalium laqueatum Vebrill. 



Plate XXVII. Fig. 1. 



Dentalium laqueatum Verrill, Trans. Conn. Acad., VI. p. 431, pi. 44, fig. 18, 1885. 



Habitat. Off the eastern coast of the United States, in 60 to 200 fms., U. S. 

 Fish Commission, from near Cape Hatteras, North Carolina, to the vicinity 

 of Cape Florida, abundant; temperature ranging from 58° to 75°. Blake 

 Expedition, at Station 9, Gulf of Mexico, in 127 fms. Off Sombrero, living, in 

 54 fms. Off Havana, in 127 to 177 fms., Sigsbee. Station 132, off Santa Cruz, 

 in 115 fms., hard bottom. Station 177, off Dominica, in 118 fms., sand. Sta- 

 tion 240, near the Grenadines, in 164 fms., coral. Station 246, off Grenada, in 

 154 fms., ooze. Stations 290, 293, and 296, near Barbados, in 73-84 fms. 

 Temperature range, from 52° to 70°. 75 F. 



This very fine species reaches the length of 55 mm. The very young have 

 generally a very slight wave on the convex side of the anal aperture ; in the 

 adults this aperture is sometimes circular and unslit ; sometimes there is a nar- 

 row slit 5.0 mm. long. The very young have the transverse sculpture most 

 prominent (aside from the strong ribs which range from nine to eleven), the 

 adolescent part the longitudinal striae, while near the lip of the adult both 

 are obsolete. I am disposed to think the species does not reach more than 

 200 fms. 



It recalls D. octagonum Lamarck, but the secondary striae in that species 

 when present are much coarser, the ribs fewer, and the taper at the posterior 

 end much more abrupt. 



B. Species vertically compressed. 



Dentalium compressum Watson. 



Dentalium compressum Watson, Lin. Soc. Journ., XIV. p. 516, April, 1879, Dall, BuU. 

 M. C. Z., IX, p, 38, 1881. Watson, Chall. Gastr., p, 9, pi. i, fig, 9, 1885. 



Habitat. Station 43, in 339 fms. Off Cape San Antonio, in 413 fms. 

 Station 2, Gulf of Mexico, in 800 fms. Station 226, near St. Vincent, in 424 

 fms., sand, temperature 42°.5. Culebra, St. Thomas, in 300 fms., Challenger. 



