48 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
Truncatulina antillarum (d’Orbigny). 
Rosalina antillarum d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ Fora- 
miniféres,”’ p. 75, pl. 5, figs. 4 to 6. 
Truncatulina antillarum Cushman, Proc. U.S. Nat. Mus., vol. 59, 1921, p. 57, pl. 13, figs. 6 to 8. 
Test biconvex, trochoid, consisting of 4 coils; chambers numerous, rather 
indistinct on the dorsal side, 7 or 8 in the last-formed coil; sutures on the dor- 
sal side very oblique, somewhat limbate, not depressed, if anything slightly 
raised, on the ventral side radiate, from a slight umbilical depression; wall 
thick, finely punctate, carinate; aperture an elongate, somewhat curved 
opening extending from the umbilicus about two-thirds of the way to the 
periphery on the ventral side of the last-formed chamber, with a slight, thin, 
overhanging lip, the chamber continuing beyond on the periphery, forming 
an angle in which the outer end of the aperture terminates; color white. 
Diameter of the Tortugas specimens up to 1 mm. 
T. antillarum was found at but two of the stations in the Tortugas 
collection, most abundant at station 42, in 18 fathoms, outside of 
the lagoon. The surface has a peculiar, waxen luster. Although the 
specimens show the sutures of the test much less clearly than do 
d’Orbigny’s figures, the general characters are the same. I have 
already recorded this from Montego Bay. D’Orbigny’s speci- 
mens were from Cuba and Jamaica, and the species is probably 
widely distributed in this general region. The species evidently 
related to this, occurred fossil in the Coastal Plain of the United 
States as far back as the Oligocene. 
Truncatulina cora (d’Orbigny). 
(Plate 7, Figures 3 to 5.) 
Rosalina cora d'Orbigny, Voy. Amér. Mérid., vol. 5, pt. 5, 1839, “‘ Foraminiféres,’’ p. 45, 
pl. 6, figs. 19 to 21. 
Test plano-convex, dorsal side slightly convex, ventral side flattened; com- 
posed of numerous chambers, usually about 6 in the last-formed whorl; 
sutures on the dorsal side nearly radiate near the center, thence curving 
backward, on the ventral side generally radiate, but with peculiar sinuous 
curves; wall coarsely punctate; aperture a narrow slit on the ventral side of 
the last-formed chamber, extending from the periphery of the preceding coil 
to the umbilicus; color of the early chambers a very dark brown, gradually 
becoming lighter, until the last two or three are white. 
Diameter of the Tortugas specimens up to 0.50 mm. 
This is a species described by d’Orbigny from the coast of Peru, 
which seems to have had little attention paid to it since. The 
specimen figured by d’Orbigny is evidently somewhat abnormal, 
although such specimens occur, as will be seen by a reference to 
plate 7, figure 5. The most striking features are the very flat 
lower side and the peculiar sinuous curves on the sutures of the 
ventral side. The ventral side of the test, although each chamber is 
flattened, is not a single plane, each chamber level being raised 
slightly above the preceding. The species has not been common in 
the area. It seems to be related to 7. candeiana d’Orbigny, the 
