74 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 



Triloculina gracilis d'Orbigny. 



Triloeulina gracilis d'Orbginy. in Do la Sajira. Hist. Fis. Pol. Nat. Cuba. 1839. "Forami- 

 nifferes." p. 159. pi. 11, figs. 10 to 12. 



Test elongate, slender, triloculine; chambers rounded; sutures very slightly 

 depressed; apertural end extended into a cylindrical neck, the outer end of 

 which is enlarged and has a phialine lip; surface smooth or very finely striate; 

 aperture circular, with a slight tooth. 



Length of the Tortugas specimens up to 0.50 mm. 



D'Orbigny described this species as rare, from shore sands of 

 Cuba and Jamaica. I did not find it in the material that I examined 

 from Montego Bay, Jamaica, but it has occurred at 4 stations in 

 the Tortugas region. It is a very slender, delicate species, most 

 easily characterized by the peculiar aperture. D'Orbigny's figures 

 of T. gracilis are fairly accurate, but they show more of a surface 

 ornamentation than appears in our specimens. 



Triloculina transversestriata (H. B, Brady). 



Miliolina transversestriata H. B. Brady, Quart. Journ. Micr. Sci.. vol. 21, 1881. p. 45; Rep. 



Voy. Challerioer, Zoology, vol. 9, 1884, p. 177, pi. 4, figs. 6 a to c. — Millett, Journ. 



Roy. Micr. Soc, 1898, p. 268, pi. 6, fig. 5. — Heron-Allen and Earland. Trans. 



Zool. Soc. London, vol. 20, 1915, p. 566, pi. 42. figs. 17 to 20. 

 Triloculina transversestriata Cushman, Proc. U. S. Nat. Mus., vol. 59, 1921, p. 70. 



Test elongate, 2 to 3 times as long as broad; periphery subacute; surface 

 ornamented by numerous obliquely transverse costse; apertural end slightly 

 extended ; aperture rounded, with a simple tooth. 



Length of the Tortugas specimens up to 0.70 mm. 



This is one of the species which connects this region with the 

 Indo-Pacific. Brady's original specimens were from Torres Strait 

 and Mauritius. Millett records it from the Malay Archipelago, and 

 Heron-Allen and Earland from the Kerimba Archipelago, off the 

 east coast of Africa, as well as from the Great Barrier Reef of Aus- 

 traUa. They also record specimens from Havana, Cuba, and I have 

 had a single specimen from Montego Bay, north coast of Jamaica. 

 In the Tortugas collection this species is represented by single speci- 

 mens from two stations, but they are typical. 



Triloculina planciana d'Orbigny. 



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

 niferes." p. 173, pi. 9, figs. 17 to 19.— Cushman, Proc. U. S. Nat. Mus., vol. 69, 

 1921, p. 70, pi. 17, figs. 7, 8. 



Test elongate; chambers distinct; sutures slightly, if at all, depressed; 

 periphery broadly rounded; wall ornamented by numerous short, incised 

 lines; aperture rounded, with a bifid tooth, projecting slightly above the 

 apertural opening; surface shiny. 



Length of the Tortugas specimens up to 0.65 mm. 



D'Orbigny described this species from Cuba and Jamaica, and I 

 found specimens in the collection from the north coast of Jamaica, 

 at Montego Bay, and also at Runaway Bay. It has occurred at 

 three-fourths of the stations in the Tortugas region. The peculiar 



