60 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 
Test elongate, broadest in the center, tapering toward either end; chambers 
rapidly thickening as added, in end view the periphery much the broadest 
portion of the test, central portion deeply excavated; periphery of the cham- 
bers in end view much convex, especially in the central portion, the edges 
broadly rounded; chambers evenly curved, the final chamber somewhat pro- 
jecting, both at the base and at the apertural ends, the latter having a decided 
neck with a phialine lip, the aperture itself rounded and with either a single 
tooth with a bifid end, the two projections forming a concave extremity, or 
in some cases a pair of such bifid teeth opposite one another; surface of the 
test dull, somewhat roughened. 
Length of the Tortugas specimens not exceeding 1 mm. 
This species is not nearly so well developed in the West Indian 
region as it is in the East Indies. Specimens are smaller and not 
nearly so deeply excavated. It has occurred at a few stations, but 
not in any great numbers. 
Spiroloculina planulata (Lamarck). 
Miliolites planulata Lamarck, Ann. Mus., vol. 5, 1805, p. 352, No. 4. 
Spiroloculina planulata Macdonald, Ann. Mag. Nat. Hist., ser. 2, vol. 20, 1857, p. 153, pl. 
6, fig. 28.—H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 148, pl. 9, 
figs. 11 a, b.—H. B. Brady, Parker, and Jones, Trans. Zool. Soc., vol. 12, 1888, p. 
214, pl. 40, figs. 14, 15. 
Test irregularly elliptical; periphery concave, especially in the last-formed 
chambers, initial end of the chamber projecting considerably beyond the 
aperture of the previous-formed one, the apertural end very slightly, if at 
all, projecting, side view concave; sutures distinct; surface matt; aperture 
withfa slight lip and an elongate tooth, slightly bifid at the tip. 
Length of the Tortugas specimens not exceeding 1 mm. 
The Tortugas specimens are very similar to that figured by Brady, 
Parker, and Jones in the above reference (plate 40, fig. 15). S. 
planulata is not as common in the Tortugas region as some of the 
other species, occurring at but 4 stations, and in few numbers. 
Spiroloculina ornata d’Orbigny. 
(Plate 10, Figure 9.) 
Spiroloculina ornata d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ Forami- 
niféres,”’ p. 150, pl. 12, figs. 7, 7 a. 
Test elongate, compressed, concave in side view, the apertural end pro- 
jecting to a considerable distance beyond the rest of the test; the last-formed 
chamber, and sometimes the one before, ornamented with a secondary costa, 
running from near the apertural end backward near the inner angle of the 
chamber; aperture quadrangular, with a single narrow tooth; surface smooth, 
shining. 
Length of the Tortugas specimens up to 1 mm. 
D’Orbigny described S. ornata from shore sands of Cuba, but the 
name has been allowed to lapse since. I found a single specimen 
in the material from the north coast of Jamaica which seemed close 
to this species, and specimens even more like d’Orbigny’s figure and 
description have occurred from several of the Tortugas stations, 
not, however, in any numbers at any one station. 
