ROTALIIDAE-ASTERIGERINA. — NUMMULITIDAE — NONIONINA. o5 



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 ^rateJoupi d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 294, No. 19; in Do la Sagra, 

 Hist. Fis. Pol. Nat. Cuba, 1839, "Foraminiferes," p. 46, pi. 6, figs. 6, 7. — Cushman, 

 Carnegie Inst. Wash., Pub. 291, 1919, p. 48; Proc. U. S. Nat. Mus., vol. 59, 1921, 

 p. 61, pi. 14, figs. 9 to 11. 



Test coiled, piano-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.) 



Polyatomella poeyana d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839. "Forami- 

 niferes," p. 55, pi. 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, 



