MILIOLIDAE — TRILOCTJLINA. 75 



surface markings in T. planciana seem to be a constant character and, 

 together with the broadly rounded form of the chambers, make it 

 distinct from any other species of the region. 



Triloculina fichteliana d'Orbigny. 



Triloculina fichteliana d'Orhigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, "Forami- 

 nifferes," p. 171, pi. 9, figs. 8 to 10.— Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 

 1917, p. 71; Proc. U. S. Nat. Mus., vol. 59, 1921, p. 70, pi. 17, figs. 1, 2. 



Test subcircular in front view, somewhat compressed ; periphery rounded ; 

 chambers distinct; sutures slightly depressed; wall ornamented by numerous 

 longitudinal costse; aperture semicircular, with a slight tooth. 



Diameter of the Tortugas specimens up to 0.60 mm. 



This species, which was described by d'Orbigny from Cuba and 

 Jamaica, is apparently widely distributed in the West Indian region. 

 I have had specimens from shallow water off the north coast of 

 Jamaica, and it has occurred at several stations in the Tortugas 

 collection, but not in any considerable numbers. Our specimens are 

 much more like the type as figured by d'Orbigny than the specimens 

 figured by later authors, in the Challenger report and elsewhere. 



Triloculina carinata d'Orbigny. 

 (Plate 12, Figure 6.) 

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

 nifferes," p. 179, pi. 10, figs. 15 to 17. — Cushman, Proc. U. S. Nat. Mus., vol. 59, 

 1921, p. 71, pi. 17, figs. 9, 10. 



Test longer than broad; surface in the adult made up of three chambers, 

 typically with the periphery carinate, with the surface ornamented with 

 small rounded pits in regular series, covering the entire surface, except about 

 the aperture; sutures distinct, somewhat depressed; aperture elongate, nar- 

 row, with a distinct, slightly everted hp, tooth very long and narrow, project- 

 ing somewhat above the apertural opening. 



Length of the Tortugas specimens up to 1.50 mm. 



D 'Orbigny described this species from Cuba as rare. I had speci- 

 mens from the north coast of Jamaica, where it is very common. 

 It has been found at numerous stations in the Tortugas region and 

 seems generally to be well distributed in the West Indies. While 

 the typical form has carinate margins, it is not unusual to find in 

 adults that the chambers become rounded. The reticulations are 

 very regular in their position and size. 



Triloculina linneiana d'Orbigny. 



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

 nifferes," p. 172, pi. 9, figs. 11 to 13. — Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 

 1917, p. 72, pi. 27, fig. 4; Proc. U. S. Nat. Mus., vol. 59. 1921, p. 70, pi. 17, figs. 3, 4. 



MUiolina linneiana H. B. Brady, Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 174, pi, 6, 

 figs. 15 to 20. 



Test typically with 3 visible chambers in the adult, elongate, tapering 

 toward either end, somewhat depressed; surface ornamented by a few very 

 prominent, raised ridges, with deep, concave depressions between; periphery 

 rounded or sUghtly elliptical, with a single or bifid tooth. 



Length of the Tortugas specimens up to 1.5 nun. 



