MILIOLIDAE—SPIROLOCULINA. 61 
Spiroloculina eximia, new species. 
(Plate 11, Figure 2.) 
Test elongate, elliptical, periphery convex, the opposite faces concave, 
ends of the chamber projecting; sutures fairly distinct, the outer angle of 
each chamber projecting above the inner portion of the adjacent next-formed 
chamber; wall with a granular, dull surface; apertural end with a projecting 
cylindrical neck, circular, with a single, very thin, slightly bifid tooth. 
Length in most specimens not exceeding 0.50 mm. 
S. eximia may be distinguished from all the other species in the 
Tortugas region by its peculiar surface, which is coarsely granular 
and dull. It somewhat resembles the form I have described as 
S. grateloupi var. incisa, but differs from that in the smaller size 
and the peculiar character of the surface. 
Spiroloculina caduca, new species. 
(Plate 11, Figures 3, 4.) 
Test broadly elliptical, much compressed, the apertural end extended; 
chambers of the adult with a sharp translucent keel, usually somewhat lobu- 
lated; sutures slightly depressed, surface of the chambers with irregular raised 
cost, more or less oblique in position; aperture at the end of the cylindrical 
neck, rounded, with a simple tooth; surface smooth, shining, but the wall 
very thin and brittle. 
Length up to 0.80 mm. 
This species, although it occurred at but two stations, is rather 
constant in its general characters. It has an extremely brittle test, 
and the peripheral keel is very thin. 
Spiroloculina antillarum d’Orbigny. 
Spiroloculina antillarum d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ For- 
aminiféres,”’ p. 166, pl. 9, figs. 3, 4—H. B. Brady, Rep. Voy. Challenger, Zoology, 
vol. 9, 1884, p. 155, pl. 10, figs. 21 a, b.—Cushman, Bull. 100, U. S. Nat. Mus., 
vol. 4, 1921, p. 407, pl. 81, figs. 4a, b; pl. 83, fig. 4? 
Test elongate, elliptical; chambers nearly circular in cross-section; surface 
ornamented by numerous longitudinal cost, often slightly oblique, both 
ends of the chamber projecting and the intermediate portions thus left either 
filled by a plate of clear material or occasionally open; apertural end projecting 
and forming a cylindrical neck with a slight lip and a single tooth, sometimes 
bifid at the tip. 
Length of the Tortugas specimens up to nearly 1 mm. 
S. antillarum, which was described by d’Orbigny from shore sands 
of Cuba, has proved to be common in this general region and is 
probably widespread in the Indo-Pacific. As I have noted pre- 
viously, it has probably been recorded by many authors under the 
name Sptroloculina grata Terquem, which Brady took as the name 
for our recent species, and which has since been followed by many 
authors. It is a species characteristic of warm, shallow water, espe- 
cially associated with coral-reef conditions. 
