MILIOLIDAE—TRILOCULINA; BILOCULINA. 77 
Triloculina labiosa d’Orbigny. 
(Plate 12, Figure 1.) 
Triloculina labiosa d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, ‘‘ Forami- 
niféres,’’ p. 157, pl. 10, figs. 12 to 14.—Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 
1917, p. 70; Proc. U. 8. Nat. Mus., vol. 59, 1921, p. 70, pl. 16, figs. 13, 14. 
Miliolina labiosa H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 170, pl. 6, 
figs. 3 to 5. 
Test much broader than long; surface largely composed of the two last- 
formed chambers; chambers often somewhat irregular; periphery rounded; 
surface smooth, but dull; aperture crescentiform, with a somewhat triangular 
tooth, placed somewhat back from the aperture. 
Diameter of the Tortugas specimens up to 0.60 mm. 
Specimens agree very closely with d’Orbigny’s figure, occurring at 
several stations, but not in any considerable numbers. D’Orbigny’s 
specimens were from Cuba; I have recorded the species also from 
several stations from the north coast of Jamaica, and it seems to be 
widely distributed in warm, shallow waters in the Indo-Pacific. It 
is very questionable as to whether the specimens recorded by Brady 
from a great depth in the Pacific really are identical with this species. 
Genus BILOCULINA d’Orbigny, 1826. 
Biloculina subspherica d’Orbigny. 
Biloculina subspherica d’Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, “‘ Forami- 
niféres,’’ p. 162, pl. 8, figs. 25 to 27.—Cushman, Proc. U. 8. Nat. Mus., vol. 59, 
1921, p. 73. 
The most common Biloculina in the Tortugas collection is this 
small one described by d’Orbigny from Cuba and Jamaica. They 
agree very well with d’Orbigny’s original figure and description, and 
also with specimens that I have had from the north coast of Jamaica. 
_ It is evidently common in the shallow water in the West Indian 
region. The specimens are all small, the largest measuring but 
slightly more than 0.5 mm. 
Biloculina millettii Cushman ? 
Miliolina eo (in part), Journ. Roy. Micr. Soc., 1898, p. 268, pl. 6, figs. 8 to 10 
(not fig. 7). 
Biloculina millettii Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 81, pl. 34, figs. 4, 5. 
_ Test in front view broadly elliptical, in end view, compressed; chambers 
biconvex; the periphery with a definitely developed carina; wall smooth, 
except for occasional transverse ribs usually indistinct; aperture slightly 
produced, broadly elliptical, with a slightly thickened border joining the 
carina at its outer edge; the aperture with a small bifid tooth. 
_ Length of the Tortugas specimen 0.70 mm. 
There is a single specimen in the collection which has the com- 
pressed form and the thin peripheral carina and large aperture which 
characterizes this species. The specimen is, however, somewhat ir- 
regular, and, being the only one found, it should await further 
material before positive identification is made. 
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