60 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 



Test elongate, broailesl in the center, tapering toward cither end; chambers 

 rapidly thickening as added, in end view the periphery nnich the broadest 

 p)ortion 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, pi. 

 6, fig. 28. — H. B. Brady. Rep. Voy. Challenger, Zoology, vol. 9, 1884, p. 148, pi. 9, 

 figs. 11 a, b.—U. B. Brady, Parker, and Jones, Trans. Zool. Soc, vol. 12, 1888, p. 

 214, pi. 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 

 with a slight Up and an elongate tooth, shghtly 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 oraata d'Orbigny. 



(Plate 10, Figure 9.) 



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

 niferes." p. 150, pi. 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. 



