52 SHALLOW-WATER FORAMINIFERA OF TORIUGAS 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 punctse, wall very tliin, translucent, 

 or even transparent where no punctae 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, "Foraminiferes," plate 5, fig. 13), 

 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 (Lmnaeus). 



(Plate 8, Figures 7 to 9.) 



"Comu Hammonis" Plancus, Conch. Min., 1739, p. 8, pi. 1, figs. 1 A to C. 



"Ammonia unita" Gaultieri, Index Test., 1742, pi. 19, figs. H, I. 



Nautilus beccarii Linnseus, Syst. Nat., ed. 12, 1767, p. 1162; ed. 13 (Gmelin's), 1788, p. 3370, 

 No. 4. 



Rotalia (Turbinulina) beccarii d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 275, No. 40; 

 Modules, 1826, No. 74.— Parker, Jones, and H. B. Brady, Ann. Mag. Nat. Hist., 

 ser. 3, vol. 16, 1865, p. 30, pi. 3, fig. 83. 



Rotalia beccarii Parker and Jones, Philos. Trans., vol. 155, 1865, p. 388, pi. 16, figs. 29, 

 30.— H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 704, pi. 107, 

 figs. 2, 3.— Go6s, Kongl. Svensk. Vet. Akad. Handl.. vol. 25, No. 9. 1894, p. 99, 

 pi. 16, fig. 811.— Flint, Rep. U. S. Nat. Mus., 1897 (1899), p. 331, pi. 75, fig. 2.— 

 Cushman, Bull. 71. U. S. Nat. Mus.. pt. 5. 1915, p. 67, pi. 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 Umbate 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 (Linnaeus), it may- 

 be questioned whether or not our minute tropical species, which is 



