DALL: MOLLUSCA AND BRACHIOPODA. 26 
ol 
Drillia decenna Datzt, n. sp. 
- Shell small, white, solid, acute, with about eight whorls, the spire longer than 
the aperture ; the two nuclear whorls are small, smooth and apically blunt, the 
succeeding ones have strong axial sculpture, but visible spiral sculpture is con- 
fined to the region of the canal; suture appressed, the anal fasciole inconspicuous ; 
axial sculpture of (on the last whorl 8-10) sharp, slightly protractive ribs, most 
prominent on the periphery, the last rib preceding the formation of the adult 
aperture distinctly larger than the rest; the ribs though not invariably continuous 
form a series obliquely ascending the spire, and in front fading out only near the 
canal where there are a few spiral threads; on the surface when not worn, can 
be discerned with a lens fine spiral striations, but whether these are generally dis- 
tributed my material is not fresh enough to show; aperture short, rather wide ; 
anal sulcus short, conspicuous, with projecting margin; outer lip slightly vari- 
cose, sharp, produced ; pillar smooth, short, straight, heavily callous; canal short, 
rather wide, the fasciole inconspicuous. Length, 12.5; of last whorl, 8.0; of 
aperture, 5.5; max. diam. 5.38 mm. 
U.S.5S. “ Albatross,” station, 2798, in 18 fathoms, sand, Panama Bay. U.S. N. 
Mus. 110,603. 
This species is related to D. ebur, D. coccinata and D. fucata of Reeve, of the 
West Indies, but has fewer and less knobby ribs than any of them, 
Gemmula exulans Dat. 
Plate 13, figure 5. 
Pleurotoma exulans Dall, Proc. U. S. Nat. Mus., 1889, 12, p. 502, pl. 5, fig. 7. 
U.S. S. “ Albatross,” station 3376, off the coast of Ecuador, in 1132 fathoms, 
ooze, bottom temperature 36° F. U.S. N. Mus. 123,095. 
An immature specimen of this species was obtained at the locality mentioned. 
The original specimens were obtained near the Galapagos Islands at stations 2807, 
in 812 fathoms, ooze, aud 2808, in 634 fathoms, sand; temperatures 38°.4 and 
40° F. 
Gemmula esuriens Datt, n. sp. 
Shell small, solid, subfusiform, of about five whorls, the nucleus defective ; 
periostracum pale olive ; suture distinct, not appressed ; fasciole hardly constricted ; 
whorls moderately rounded, the suture between them not deep; axial sculpture 
of incremental lines and about twelve peripheral rounded low nodules, hardly pro- 
duced enough to be termed ribs; spiral sculpture in front of the periphery of 15- 
20 incised, rather distant, obscure lines extending to the canal; none is visible 
behind the periphery where the sculpture consists chiefly of incremental lines and 
faint traces of vermiculation; aperture lunate; anal sulcus wide, shallow; outer 
