40 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
They have a beautiful brown color, the wall translucent, and on 
the ventral side especially have a peculiar appearance, due to the 
lack of the puncte in the umbilical area. There is some slight 
variation, as shown in the figures (plate 5, figs. 11, 12), but all have 
the characteristic color and general appearance from both the 
dorsal and ventral sides. 
Discorbis advena, new species. 
Discorbina rosacea H. B. Brady (in part) (not d’Orbigny), Rep. Voy. Challenger, Zoology, 
vol. 9, 1884, p. 644, pl. 87, fig. 1—Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 
327, pl. 72, fig. 3 ?. 
Test rotaliform, dorsally convex, ventrally concave, composed of numer- 
ous chambers, usually 6 in the last-formed coil, distinct, the periphery rounded 
in the final chambers, earlier development with a rather acute edge; sutures 
distinct, very slightly depressed, oblique; wall fine, translucent, very finely 
punctate; on the ventral side the test is umbilicate, the chambers ending in 
a peculiar inflated point; aperture a very narrow, slightly curved opening at 
the base of the inner margin of the last-formed chamber. 
Diameter up to 0.5 mm. 
This is one of the most common species of this genus in the col- 
lection, occurring at more than half the stations. It is very close 
to the figure given by Brady, referred to Discorbina rosacea d’Orbigny. 
A comparison of this with d’Orbigny’s original Modéle, however, 
shows little in common between the two. The figures given by 
Flint may possibly be this species also. This is very different from 
the figures given by Brady as Discorbina rosacea (plate 87, fig. 4). 
The species does not seem to have been definitely described and 
figured, and I have here given it a new name in order that it may be 
distinguished, if, as is probable, this distribution may be fairly 
wide in the warm waters of this general region in the Atlantic. Spec- 
imens in the Tortugas collection showed very little variation, and 
the species has been a very clear-cut one at all the stations where 
it occurred. 
Discorbis auberii (d’Orbigny). 
Rosalina auberii d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ Forami- 
niféres,”’ p. 94, pl. 4, figs. 5 to 8.—Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, 
p. 59, pl. 14, figs. 1 to 3. 
Test rotaliform, with a low spire; periphery carinate, acute, the ventral 
side slightly, if at all, convex; composed of several coils with 4 chambers in 
each; sutures distinct, somewhat depressed, oblique on the dorsal side, nearly 
radiate on the ventral; wall rather coarsely perforate; aperture at the base 
of the last-formed chamber, a curved, narrow slit. 
Diameter of the Tortugas specimens 0.40 mm. 
D’Orbigny described this species from Cuba and Martinique, and 
I have recorded it from the north coast of Jamaica. The only 
station in the Tortugas collection at which it has occurred is station 
10, where it is rare. 
