52 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
formed coil, the last-formed chamber on the ventral side making up nearly 
half the area of the test; periphery sharply carinate; sutures depressed slightly, 
distinct, curved; wall very finely punctate, except the inner part of ventral 
side, which is of clear shell material without puncte, wall very thin, translucent, 
or even transparent where no puncte exist; aperture a small opening at 
the ventral side of the last-formed chamber, narrow, slightly curved. 
Diameter up to 0.50 mm. 
This species has occurred at four of the stations only, and then 
rarely. It is very similar to the figure given by Brady, Parker, and 
Jones in the above reference. Their specimens were found in two 
of the shallower soundings from the Abrohlos Bank, off Brazil. 
Somewhat similar forms were found in the tropical Pacific, in the 
Philippines, and elsewhere. They are very distinct from Pulvinulina 
oblonga Williamson, especially in the ventral side. The dorsal side- 
is very similar to d’Orbigny’s figure of Rotalina sagra (in De la Sagra, 
Hist. Fis. Pol. Nat. Cuba, 1839, ‘“‘Foraminiféres,” plate 5, fig. 18), 
but the ventral side is very different. The wall is finely and evenly 
punctate, except a considerable area near the ventral angle, where it is 
transparent and clear. It is very few-chambered, agreeing in that re- 
spect both with d’Orbigny’s specimen and that already noted off Brazil. 
The species is probably widely spread in shallow water in the West 
Indian region and perhaps in the Indo-Pacific as well. The specimen 
which I have recorded from Jamaica as Pulvinulina oblonga is 
probably this same species. 
Genus ROTALIA Lamarck, 1804. 
Rotalia beccarii (Linnzus). 
(Plate 8, Figures 7 to 9.) 
“Cornu Hammonis’’ Plancus, Conch. Min., 1739, p. 8, pl. 1, figs. 1 A to C. 
‘Ammonia unita’’ Gaultieri, Index Test., 1742, pl. 19, figs. H, I. 
Nautilus beccarii Linnzus, Syst. Nat., ed. 12, 1767, p. 1162; ed. 13 (Gmelin’s), 1788, p. 3370, 
No. 4. 
Rotalia (Turbinulina) beccarit d’Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 275, No. 40; 
Modéles, 1826, No. 74.—Parker, Jones, and H. B. Brady, Ann. Mag. Nat. Hist., 
ser. 3, vol. 16, 1865, p. 30, pl. 3, fig. 83. 
Rotalia beccarii Parker and Jones, Philos. Trans., vol. 155, 1865, p. 388, pl. 16, figs. 29, 
30.—H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 704, pl. 107, 
figs. 2, 3.—Goés, Kongl. Svensk. Vet. Akad. Handl., vol. 25, No. 9, 1894, p. 99, 
pl. 16, fig. 811.—TIlint, Rep. U. S. Nat..Mus., 1897 (1899), p. 331, pl. 75, fig. 2.— 
Cushman, Bull. 71, U. 8S. Nat. Mus., pt. 5, 1915, p. 67, pl. 30, fig. 3. 
Test almost equally biconvex, the dorsal side slightly more than the ven- 
tral; chambers numerous, 7 or 8 in the last-formed whorl; peripheral margin 
rounded; sutures limbate above, ventrally much depressed; toward the um- 
bilicus the chambers separated, forming angular open spaces, the ends of 
the chambers extended to a point; wall smooth, finely punctate; aperture a 
narrow slit beneath the inner angle of the last-formed chamber, supple- 
mented in most specimens by a nearly circular, small opening near the base 
of the ventral face of the last-formed chamber. 
Diameter of the Tortugas specimens not over 0.35 mm. 
While this has been referred to Rotalia beccarii (Linnzus), it may 
be questioned whether or not our minute tropical species, which is 
