70 SHALLOW-WATER FORAMINIFERA OF TORTUGAS REGION. 



Earland, this may be the same as the species which d'Orbigny 

 named Q. variabilis, but as that species was undescribed and nob 

 figured until Fornasini's publication in 1905, Millett's name must be 

 kept and d'Orbigny's allowed to lapse. 



Genus ARTICULINA d'Orbigny, 1826. 



Articulina sagra d'Orbigny. 



Articulina sagra d'Orbigny. in De la Sagra. Hiat. Fia. Pol. Nat. Cuba. 1839. "Forami- 

 nifferes." p. 160. pi. 9, figa. 23 to 26. — Cushman. Proc. U. S. Nat. Mu8., vol. 59, 

 1921, p. 73. pi. 18. figs. 2 to 5. 



Test elongate, composed of two portions, the earlier triloculine, the later 

 uniserial, the triloculine portion generally elliptical, with a rounded periph- 

 ery and longitudinal costte, the uniserial portion consisting of from 1 to 3 

 chambers, each broader than the preceding, transverse section circular or 

 broadly elhptical ; the aperture the broadest portion of the test, with an everted 

 Up; the wall of the chamber longitudinally costate. 



The longest of the Tortugas specimens measures 1 mm. 



D'Orbigny's type figures show specimens very similar to those 

 figured here, and this is undoubtedly the same as the form that he 

 had. It is not common in the Tortugas region. D'Orbigny's speci- 

 mens were from Cuba, Jamaica, and Martinique. 



Articulina mexicana, new species. 

 (Plate 11, Figures 7, 8.) 

 Vertebraltna sp. Cushman. Proc. U. S. Nat. Mus., vol. 59, 1921. p. 64. 



Test somewhat compressed, generally rounded, the last-formed coil com- 

 posed of 2 to 3 chambers; sutures somewhat indistinct, the single, uniserial 

 chamber in the adult somewhat more compressed toward the apertural end, 

 which has a somewhat everted hp, but extending only slightly beyond the 

 general outhne of the chamber; surface smooth, shining. 



Length of the largest specimens slightly exceeding 1 mm. in the Tortugas 

 collection. 



This species is very abundant at one station and rare at one 

 other, both stations on the outer or open-ocean side of Loggerhead 

 Key. They are similar to specimens which I had from the north 

 coast of Jamaica. The test is a thick one, smooth and shining. 

 Specimens with the uniserial chamber are rare. 



Articulina lineata H. B. Brady. 



(Plate 12, Figure 4.) 



Articulina lineata H. B. Brady. Rep. Voy. Challenger, Zoology, vol. 9. 1884. p. 183. pi. 12, 

 figs. 19 to 21.— Cu.shman. Proc. U. S. Nat. Mus.. vol. 59, 1921, p. 73. pi. 18, fig. 6. 



Test much compressed, even in the early portion, which is triloculine, the 

 later portion consisting of 1 or 2 much compressed chambers in linear arrange- 

 ment; the aperture with a lip much thickened at the edge, but not everted and 

 not extending out beyond the periphery of chamber; chambers distinct, with 

 numerous fine longitudinal costse; wall translucent, of a bluish-white color. 



Length of the Tortugas specimens up to 1 mm. 



A. lineata was described by Brady from the Fijis, and was also 

 recorded off Bermuda by him. I had specimens from two stations 



