FORAMINIFEEA OF THE ATLANTIC OCEAN 65 



Test in the adult with three visible chambers, the anoles usually 

 rounded, test somewhat longer than broad; sutures distinct, depressed; 

 wall ornamented by numerous fine longitudinal costae; aperture nearly 

 circular with a narrow bifid tooth. 



Length about 1 mm. 



This species has been recorded from north of the West Indies and 

 in the region of the British Isles as well as in the other oceans. 



TRILOCULINA SUBORBICULARIS d'Orbigny 



Plate 16, Figure 5; Plate 17, Figure 3 



Trilomlina siiborbicularis o'ORBiGf^Y, Ann. Sci. Nat., vol. 7, 1826, p. 300, 

 No. 12; in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 1839, "Foraminifdrcs," 

 p. 177, pi. 10, figs. 9-11.— Ctjshman, Bull. 71, U. S. Nat. Mus., pt. 6, 

 1917, p. 70, pi. 21, fig. 3; Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 

 461. 



Milioli7ia suborbicularis Sidebottom, Mem. Proc. Manchester Lit. Philos. 

 Soc, vol. 48, No. 5, 1904, p. 9; vol. 54, No. 16, 1910, p. 3.— Heron-Allen 

 and Earland, Journ. Roy. Micr. Soc., 1911, p. 304; Trans. Zool. Soc, 

 London, vol. 20, 1915. p. 560; Trans. Linn. Soc. London, ser. 2, vol. 11, 

 1916, p. 210, pi. 39, figs. 7-9; Bull. Soc. Sci. Hist. Nat. Corse, 1922. 

 p. 117. 



Test suborbicular, much compressed laterally, often broader than 

 long, peripheral margin rounded ; sutures distinct, depressed ; wall 

 longitudinally costate, the earliest chambers sometimes nearly smooth ; 

 aperture subcircular with a flattened lip, tooth simple, semicircular, 

 at some distance in front of the aperture on the periphery of the 

 preceding coil. 



Diameter, 0.85 mm.; thickness, 0.30 mm. 



Nearly all the records for this species are from the Mediterranean 

 and Indo-Pacific. Heron-Allen and Earland record it from off the 

 west coast of Scotland, and I have specimens from the north coast 

 of Jamaica that are apparently this species. 



SPECIES WITH RETICULATE SURFACE 



TRILOCULINA CARINATA d'Orbigny 



Plate 17, Figure 4 



Triloculina carinata d'Orbigny, in De la Sagra, Hist. Fis. Pol. Nat. Cuba, 

 1839, "Foraminiferes," p. 179, pi. 10, figs. 15-17.— Cushman, Proc. U. S. 

 Nat. Mus., vol. 59, 1921, p. 71, pi. 17, figs. 9, 10; Publ. 311, Carnegie 

 Instit. Washington, 1922, p. 75, pi. 12, fig. 6. 



Test longer than broad; surface in the adult made up of three 

 chambers, typically with the periphery carinate, with the surface 

 ornamented with small rounded pits in regular series, covering the 

 entire surface, except about the aperture; sutures distinct, somewhat 

 depressed; aperture elongate, narrow, with a distinct, slightly everted 

 lip, tooth very long and narrow, projecting somewhat above the 

 apertural opening. 



