ROTALIIDAE-ASTERIGERINA.—NUMMULITIDAE—NONIONINA. 55 
characters of that genus in the supplementary chambers on the 
ventral side and a peculiar roughened character near the aperture. 
The supplementary chambers, however, seem to be definite and a 
part of the test itself, in which they seem to be very different from 
the development seen on the ventral side of Discorbis and other 
genera with which they have been compared. 
The genus Asterigerina goes back in the Coastal Plain region at 
least to the lower Oligocene. 
A. carinata is one of the few species that occurred at all the stations 
here recorded. 
Family NUMMULITID&. 
Genus NONIONINA d’Orbigny, 1826. 
Nonionina grateloupi d’Orbigny. 
(Plate 9, Figures 7, 8.) 
Nonionina grateloupi d’Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 294, No. 19; in De la Sagra, 
Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ Foraminiféres,”’ p. 46, pl. 6, figs. 6, 7—Cushman, 
Carnegie Inst. Wash., Pub. 291, 1919, p. 48; Proc. U. S. Nat. Mus., vol. 59, 1921, 
p. 61, pl. 14, figs. 9 to 11. 
Test coiled, plano-spiral, the sides equally biconvex, in front view the 
sides of the chamber almost parallel throughout their length; periphery 
broadly rounded; chambers numerous, 10 to 12 usually in the last-formed coil 
in adult specimens, chambers increasing in length rapidly in the last-formed 
portion, distinct; sutures slightly depressed; wall smooth, finely punctate; 
aperture small, at the base of the last-formed chamber; color white. 
Length of the Tortugas specimens up to 0.60 mm. 
N. grateloupi was originally described by d’Orbigny from Cuba, 
Jamaica, and Martinique. I have recorded it from the marl, gorge 
of Yumuri River, Matanzas, Cuba, and from Santo Domingo, Bluff 
3, Cercado de Mao; I have also recorded it from stations in Montego 
Bay, on the north coast of Jamaica. All the Nonioninas in the 
Tortugas collection can be referred to this one species. There is 
some variation in the form of the test and in the side view, according 
to whether it has begun to pile up chambers in a straight line in the 
adult or whether it is still adding to its length. A series of figures 
showing this development are here given. The most constant char- 
acter distinguishing this species is the front view, which shows the 
rounded periphery and the sides of the test nearly parallel. It is 
common at most of the stations from which the material was obtained. 
Genus POLYSTOMELLA Lamarck, 1822. 
Polystomella poeyana d’Orbigny. 
(Plate 9, Figures 9, 10.) 
Polystomella poeyana d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘* Forami- 
niféres,’’ p. 55, pl. 6, figs. 25, 26. 
Test equally biconvex, composed of numerous chambers, 8 to 12 in the 
last-formed coil, each inflated; the periphery somewhat lobulate, especially 
in the last-formed portion, periphery in apertural view broadly rounded, 
