DALL: MOLLUSCA AND BRACHIOPODA. 359 
Station. Locality. Depth. Bottom. Bot. temp. F. Mus. Reg. 
2839 Sta. Barbara Islands 414 sand 419.4 122814 
8354 off Panama 822 mud 46°.0 122983 
3392 ef ss 1270 hard 86°.4 122984 
3393 Sige ae (Type) 1020 mud 86°.8 122985 
3394 §§ ne 611 “s 41°.8 122986 
3418 off Mexico 660 sand 39°.0 122987 
8430 Ee se > BaP} G 87°.9 122988 
3431 Gulf of California 995 mud 37°.8 122989 
2923 off San Diego, Cal. 822 ss 39°.0 110672 
This is one of the most elegant and abundant species of the region with a geo- 
graphical range of forty degrees in longitude and nearly 2000 miles in latitude. 
Dentalium brevicornu PItspry anp SHarpP. 
Dentalium (Compressidens) brevicornu Pilsbry and Sharp, Man. Conch., 1897, 17, 
p. 125, pl. 22, figs. 53, 54, 55. 
U.S. 5S. “ Albatross,” station 2807, near the Galapagos Islands, in 812 fathoms, 
ooze, bottom temperature 38°.4 F.; at station 2808, in 634 fathoms, sand, tem- 
perature 40° (U. 8S. N. Mus. 122,809) ; and station 3431, off Mazatlan, Mexico, 
in 995 fathoms, mud, temperature 37°.0. 
Very closely allied to the Atlantic D. pressum Pilsbry and Sharp, but the 
tube increases more rapidly in caliber, and is decidedly less compressed on the 
outer curve, according to Pilsbry, op. cit. 
Dentalium dalli Pirspry anp SHARP. 
Dentalium (Rhabdus) dalli Pilsbry and Sharp, Man. Conch., 1897, 17, p. 114, pl. 21, 
fig. 46. 
U. 8. 8. “ Albatross,” station 3354, Gulf of Panama, in 322 fathoms, mud, 
bottom temperature 46° F. U.S. N. Mus. 122,991. Also at station 3418, off the 
coast of Mexico, near Acapulco, in 660 fathoms, sand, bottom temperature 39° F. ; 
station 4654, off Aguja Point, Peru, in 1036 fathoms, mud, temperature 38°.5 ; sta- 
tion 3346, off Tillamook, Oregon, in 786 fathoms, mud, temperature 37°.3 ; station 
3200, in the western entrance to the Santa Barbara channel, California, in 265 
fathoms, mud, temperature 43°.1 ; and northward to Bering Sea, where it occurs 
north of Unalashka in from 109 to 350 fathoms. 
Pilsbry notes that this species differs from specimens of D. pretiosum, which 
sometimes approach it very nearly in size and form, by its extreme thinness and 
fragility, beside lacking the apical striation of young D. pretiosum. 
Specimens from off Acapulco reach a length of 66.0 with an oral diameter of 
4.5 -mm. 
