Sie BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Oscorys rotunda Da tt, n. sp. 
Plate 4, figure 9. 
_ Shell globose, with a moderately elevated, blunt-tipped spire, and about six 
whorls; suture distinct, not channelled, the whorl immediately in front of it a little 
flattened; spiral sculpture of (on the penultimate whorl between the sutures eleven, 
on the last whorl about thirty-seven) subequal, regular, flattish cords with narrower 
channelled interspaces; the cord in front of the suture is feeble, in front of it the 
next half dozen are a little stronger and more distant than the remainder, which 
are almost absolutely similar; axial sculpture of fine rather regularly spaced little 
elevated lines which occasionally override the cords but are mostly confined to the 
interspaces which they reticulate; there are also perceptible incremental lines; the 
substance of the shell is very pale flesh color, covered with a thin, smooth, olive- 
gray periostracum; the specimen has not formed the outer lip, but the aperture 
is lunate, ample, and with a short shallow canal; inner lip slightly erased and pol 
ished, not callous; pillar simple, twisted, anteriorly obliquely attenuated; axis not 
pervious; a moderately distinct siphonal fasciole; there is a very thin layer of callus 
on the pillar, this is broken anteriorly, showing a minute chink beneath it; throat 
white, the sculpture showing through the thin shell but not lirate. Length of shell, 
45; of last whorl, 37; of aperture, about 25; max. diam. 29 + mm. 
U.5. 8. “ Albatross,” station 3360, Gulf of Panama, in 1672 fathoms, sand, 
bottom temperature 42°F. U.S. N. Mus. 123,029. 
The operculum is like that figured im the aperture of O. pacifica (Plate 4, fig- 
ure 7). The shell is not unlike that species, but is larger, and has not the large 
and deep umbilicus of O. pacifica, neither does it agree closely with any of the 
Atlantic species. 
Osdcorys elevata Datu, n. sp. 
Plate 8, figure 9. 
Shell thin, white, bucciniform, with a thin pale straw-colored dehiscent peri- 
ostracum, with about five rounded whorls exclusive of the (lost) nucleus; suture 
distinct, not appressed; surface spirally sculptured with (between the sutures ten, 
on the last whorl about twenty-two flat spiral elevated bands separated by wider 
but distinctly channelled interspaces ; the bands are somewhat irregular in size and 
occasionally bifid by a median moderately impressed line; axial sculpture com- 
prising fine, regular, close elevated lines, equally spaced and, while absent from the 
flat tops of the broader spirals, yet crenulating their angular edges and more or 
less evident in the channels between them; aperture semilunate, outer lip simple, 
smooth, slightly reflected ; body with a thin wash of minutely granular callus, 
which also covers the short twisted pillar, leaving a minute chink behind it; pillar 
obliquely truncate in front, twisted, not axially pervious; canal short, wide, slightly 
recurved, with no fasciole; operculum like that of Lunatia in form, comprising 
about one whorl. Alt. of shell, 60; of last whorl, 47; of aperture, 35; max. diam. . 
3l mm. 
