DALL: MOLLUSCA AND BRACHIOPODA. 283 
or the periphery on the last whorl; spiral sculpture confined to the whorl in front 
of the fasciole and consisting of (on the penultimate whorl about fifteen) fine, sharp 
incised lines, on the body of the whorl rather distant, the interspaces flat and often 
unequal but toward the canal closer and more regular; aperture semilunar; anal 
Sulcus near the suture, wide, shallow ; outer lip very thin, sharp, simple; body 
Polished ; pillar straight, gyrate, obliquely truncate in front; axis pervious; canal 
short, wide, in front slightly flaring, Lon. of shell, 41; of last whorl, 24; of 
aperture, 16; max. diam. 13.5 mm. 
U. 8. 8. “ Albatross,” station 3376, off the coast of Ecuador in 1182 fathoms, 
ooze, bottom temperature 36° F. U. S. N. Mus. 193,135. 
Pleurotomella (Pleurotomella) sp. indet. 
A species of this group, but with the exterior so eroded as to be unrecogniz- 
able, though apparently different from any heretofore mentioned, was obtained 
East of Mapelo Island, in the Gulf of Panama, at station 8381, in 1772 fathoms, 
mud, bottom temperature 359.8 F., and at station 3418, off Acapulco, Mexico, 
in 660 fathoms, sand, temperature 39°. U. S. N. Mus. 123,124. 
Pleurotomella (Phymorhynchus) argetá Darr. 
Plate 19, figure 8. 
Pleurotomella argeta Dall, Proc. U. S. Nat. Mus., 1880, 12, p. 807, pl. 6, fig. 5. 
US S Albatross,” station 2807, near the Galapagos Islands, in 812 fathoms, 
mud, bottom temperature 389.4 F. U. S. N. Mus. 96,552. Also at station 
3407, in 885 fathoms, ooze, temperature 379.2 F. U. S. N. Mus. 123,138. 
Though snow-white and perfectly smooth, except for incremental lines, this 
Species by the characters of the animal belongs with the brown spirally seulp- 
tured forms which follow. 
Pleurotomella (Phymorhynchus) cingulata Dall. 
Plate 19, figure 6. 
Pleurotomella cingulata Dall, Proc. U. S. Nat. Mus., 1889, 12, p. 306, pl. 6, fig. 2. 
US B Albatross," station 9793, off the coast of Ecuador, in 741 fathoms, 
mud, bottom temperature 389.4, Also at station 2807, near the Galapagos Islands, 
m 812 fathoms, mud, same temperature. U. 8. N. Mus. 96, 554. 
This very handsome species is fully described and figured in the publication 
Yeferred to above, 
