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, sUghtly 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 elhptical, 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 

 costae, more or less obUque in position ; aperture at the end of the cyhndrical 

 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- 

 aminiferes," p. 166, pi. 9, figs. 3, 4— H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 155, pi. 10, figs. 21 a, b. — Cushman, Bull. 100, U. S. Nat. Mua., 

 vol. 4, 1921, p. 407, pi. 81, figs. 4 a, b; pi. 83, fig. 4? 



Test elongate, elhptical; chambers nearly circular in cross-section; sm'face 

 ornamented by numerous longitudinal costae, 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 cyhndrical 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 Spiroloculina 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. 



