62 SHALLOW- WATER FORAMINIFERA OF TORTUGAS REGION. 



Spiroloculina antillanim d'Orbigny var. angulata Cushman. 



Spiroloculina grata II. H. brudy (in part), Hop. Voy. Challenger, Zoology, vol. 9, 1884 



pi. 10, figa. 22, 23. 

 Spiroloculina grata Terquem var. angulala Cushman, Bull. 71, U. S. Nat. Mua., pt. 6, 1917, 



p. 36. pi. 7, fig. 5. 

 Spiroloculina antillarum d'Orbigny var. angulata Cushman, Bull. 100, U. S. Nat. Mus., 



vol. 4, 1921, p. 408, pi. 81, figs. 5a, b. 



This variety differs from the typical in the angular form of the 

 chamber instead of the more or less cylindrical form characteristic 

 of the typical. It is usually associated with the typical where found. 



Spiroloculina arenata Cushman. 

 Spiroloculina arenata Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, p. 63, pi. 14, fig. 17. 



Test compressed; chambers in a single plane, each much greater in diam- 

 eter at the initial end, gradually narrowing to the aperture, both ends pro- 

 jecting beyond the ends of the preceding chamber; apertural end produced 

 into a rounded neck, periphery broadly rounded; sutures deep and distinct; 

 wall of sand-grains rather coarse for the size of the test; aperture rounded. 



Length of the Tortugas specimens 0.50 to 0.75 mm. 



This species, which I described from collections from the north 

 coast of Jamaica, at Montego Bay, in shallow water, is very common 

 in the Tortugas region, occurring at nearly all the stations, often 

 in considerable numbers. It is rather constant in its characters, 

 both at the Tortugas and in Jamaica, and probably is widely dis- 

 tributed in the West Indian region in shallow water. 



Genus PLANISPIRINA Seguenza, 1880. 



Planispirina auriculata Egger. 



(Plate 10, Figure 8.) 



Planispirina auriculata Egger, Abh. Kon. Bay. Akad. Wiss. Munchen, CI. II, vol. 18, 

 1893, p. 245, pl. 3, figs. 13 to 15. — Heron-Allen and Earland, Trans. Zool. Soc. 

 London, vol. 20, 1915, p. 590, pl. 46, figs. 3 to 7. 



Test minute, generally oval in outline, biconvex, consisting of a few milio- 

 line chambers, the apertural end somewhat extended, turned so that the aper- 

 ture is entirely at one side of the test; aperture elUptical or rounded, with a 

 broad, flaring lip; sutures fairly distinct, not depressed, wall translucent; 

 color bluish-white. 



Length of the Tortugas specimens up to 0.20 mm. 



Single specimens of this species occur at two stations in the region, 

 and it must have a fairly wide range, as I have had specimens from 

 Dr. C. H. Edmondson from as far north as the Beaufort region of 

 North Carolina. Egger's specimens were from off Mauritius and 

 western Australia, those of Heron-Allen and Earland from the Ker- 

 imba Archipelago, off the eastern coast of Africa. 



Genus VERTEBRALINA d'Orbigny, 1826. 



Vertebralina cassis d'Orbigny. 



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

 nif6res," p. 51, pl. 7, figs. 14, 15.— Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, 

 p. 64, pl. 15, figs. 1, 4 (not 2, 3, 5 to 8). 



Test compressed, for the most part piano-spiral; periphery of each chamber 

 with a broad, thin keel, 2 to 3 chambers in the last-formed coil, the main 



