DALL: MOLLUSCA AND BRACHIOPODA, 305 
whorls, followed by five subsequent whorls; spire acute, whorls moderately 
rounded, the last much the largest; sculpture on the early whorls decussate by 
fine transverse riblets, strongest near the suture, and flattish spiral threading; 
later the whorls are polished, smooth, except for lines of growth and narrow, 
distant, sharp grooves ; suture with a narrow channel; aperture long, narrow, 
with a shallow narrow sinus behind and a deep siphonal sulcus in front; outer 
lip thickened, flexuous, obscurely lirate behind, body with a thin callus; pillar 
white, concave, with a prominent margin, shorter than the aperture. Operculum 
narrow, elongate-oval, with an apical nucleus. Height of shell, 31.5; of last 
whorl, 24.5 ; diameter, 13.0 mm. 
U. S. 8. “ Albatross,” station 3390, in the Gulf of Panama, in 56 fathoms, 
sand, temperature 62°.6. U.S. N. Mus. 122,009. 
Owing to the fact that the accessible species referred to Truncaria were all 
generically different from the present shell, and the original type unknown to me, 
this species was provisionally referred to Cominella in my preliminary diagnosis. 
Further study led to the discovery of its true relations. 
VOLUTOPSIUS Morcu. 
Volutopsius? amabilis Datt, n. sp. 
Plate 11, figure 9. 
Shell decollate, subcylindric, with an apparently blunt spire, whitish, with pale- 
brown, dull periostracum, and about four whorls, exclusive of the lost nucleus ; 
suture distinct, not channelled, the whorl slightly constricted in front of it ; axial 
sculpture only of faint lines of growth; spiral sculpture of (on the penultimate 
whorl about seven) weak, narrow, channelled, incised lines, with flat, wider 
interspaces and a still wider, smooth space between the first channel and the 
suture; the interspaces are narrower and somewhat rounded near the canal; 
aperture lunate, outer lip somewhat varicose, simple, entire, vertical ; body with 
a smooth callus extendig on to the short, slightly twisted pillar; canal very 
short, wide, not constricted; operculum short, ovate, with the nucleus near but 
within the apical margin. Lon. of last two whorls, 10.5; of last whorl, 8.5; of 
aperture, 6.0; max. diam. 5.2 mm. 
U.S. 5S. “ Albatross,” station 3392, Gulf of Panama, in 1270 fathoms, hard 
bottom, temperature 36°.4 F. U.S. N. Mus. 123,008. 
This curious little shell is too imperfect for final decision as to its place in the 
system. It has a distant resemblance to Truncaria, but the form of the operculum, 
as well as the peculiar blunt spire, remove it from that genus. It resembles as 
much as anything the young shell of a species of Beringius. The operculum is 
not Columbelloid or Purpuroid. 
VOL. XLIII. — NO. 6 20 
