64 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 



ing in toward the cent(M- from opposite sides, oacli (liickpnod toward the end, 

 lip slightly everted, thin. 



Ix^npth of largest Tortugas specimens 1.25 mm. 



Q. agghUinans is very common in the region and is very similar 

 to the specimens figured by d'Orl)igny. His specimens were from 

 Jamaica and Cuba, and 1 have found it to be common in the general 

 West Indian region. Alany different forms have been referred to 

 this species by authors since d'Orbigny's time, but in the West Indies 

 at least there is a well-defined species which should bear this name. 

 Specimens occurred at every one of the 20 stations in the Tortugas 

 region. 



Quinqueloculina bidentata d'Orbigny. 



Quinqueloculina bidentata d'Orbigny, in De la Sagrn, Hist. Fis. Pol. Nat. Cuba, 1830, 

 "Foraminif^res," p. 197, pi. 12, ; figs. 18 to 20. — Cushman, Proc. U. S. Nat. Mus., 

 vol. 59, 1921, p. G5, pi. 15, figs. 11, 12. 



Test somewhat longer than broad; chambers distinct; periphery squarely 

 truncate; wall composed of ratlier coarse sand-grains; apertural end projecting, 

 with a slightly thickened lip; aperture with a thin tooth with a broad, bifid tip. 



Length of largest Tortugas specimens 1.5 mm. 



This species originally described by d'Orbigny from Cuba, was 

 found to be frequent at Runaway Bay, on the north coast of Jamaica, 

 and has occurred at several stations in the Tortugas, although it is 

 not nearly so common as Quinqueloculina agglutinans. 



Quinqueloculina alveoliniformis (H. B. Brady). 



Miliolina alveoliniformis H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 1879, p. 268; Rep. 



Voy. Challenger, Zoology, vol. 9, 1884, p. 181, pi. 8, figs. 15 to 20. 

 Quinqueloculina alveoliniformis Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 43; 



Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 443; Proc. U. S. Nat. Mus., vol. 59, 



1921, p. 64. 



This is a species of coral-reef areas, in warm, tropical waters. The 

 specimens from the West Indies are thicker and not so elongate nor 

 so large as is characteristic of similar conditions in the East Indies 

 and in the Philippines. It may be that this is a distinct variety in 

 the West Indian region. Although found at several stations, it is 

 never common, so far as the Tortugas collection shows. 



Quinqueloculina lamarckiana d'Orbigny. 



Quinqueloculina lamarckiana d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, 



"Foraminif feres," p. 189, pi. 11, figs. 14, 15. — Cushman, Proc. U. S. Nat. Mus., 



vol. 59, 1921, p. 65, pi. 15, figs. 13, 14. 

 Quinqueloculina auberiana d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, 



"Foraminifferes," p. 193, pi. 12, figs. 1 to 3. 

 Quinqueloculina cuvieriana H. B. Brady (not d'Orbigny), Rep. Voy. Challenger, Zoology, 



vol. 9, 1884, p. 162, pi. 5, figs. 12 a to c. 



Test nearly as broad as long; chambers distinct; sutures slightly depressed; 

 chambers generally triangular in transverse section, the angles subacute but 

 not carinate; wall smooth and shiny; apertural end of the chamber slightly 

 extended, forming an elliptical neck without a definite lip, but with a narrow 

 elongate tooth. 



Length of the Tortugas specimens up to 1 mm. 



