FOEAMINIFEEA OF THE ATLANTIC OCEAN 09 



figured. It shows a decided resemblance to this species which is 

 known from the Indo-Pacific. 



PYRGO DENTICULATA (H. B. Brady) 



Plate 18, Figures 3, 4 



Biloculina ringens Lamarck, var. dentic\data H. B. Brady, Rep. Voy. Chal- 

 lenger, Zoology, vol. 9, 1884, p. 143, pi. 3, figs. 4, 5. — Woodward, The 

 Observer, vol. 4, 1S93, p. 76. — Millett, Journ. Roy. Micr. Soc, 1898, 

 p. 262.— Chapman, Journ. Linn. Soc. ZooL, vol. 28, 1902, p. 398 (list). — 

 Dakin, Rep't. Pearl Oyster Fish. Ceylon, 1906, p. 220. — Heron-Allen and 

 Earland, Trans. Zool. Soc. London, vol. 20, 1915, p. 551, pi. 40, figs. 

 11-13. 



Biloculina denticulata Cushman, Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 80, 

 pi. 33, fig. 1; Bull. 100, U. S. Nat. Mus., vol. 4, 1921, p. 476, pi. 98, figs. 

 3 a-b; Publ. 311, Carnegie Instit. Washington, 1922, p. 78; Publ. 342, 

 1924, p. 70; Publ. 344, 1926, p. 83.— Hanzawa, Jap. Journ. Geol. Pal.^ 

 vol. 4, 1925 (1926), p. 38 (table). 



Test elongate, roughly quadrangular in front view; in end view 

 somewhat compressed, biconvex; apertural end broadly rounded; 

 opposite end with a series of short, irregular teeth; wall smooth, 

 usually pohshed; aperture very broad and narrow, extending nearly 

 the whole width of the test, the ends somewhat expanded, with a long, 

 narrow tooth, making the inner border of the aperture plate-like, 

 somewhat raised above the level of the surface to which it is attached, 

 as is the whole border of the aperture. 



Length, 1.10 mm.; breadth, 0.80 mm.; thickness, 0.60 mm. 



This is typically an Indo-Pacific species and is widely distributed 

 in shallow water, coral-reef conditions. In the Atlantic it is known 

 from the West Indies in shallow water at various locahties and is 

 recorded from the Cape Verde Islands. 



The denticulate border is not always present but the general shape 

 of the test is constant. 



PYRGO DENTICULATA (H. B. Brady), var. STRIOLATA (H. B. Brady) 



Plate 18, Figures 5 a-c 

 Biloculina ringens (Lamarck), var. striolata H. B. Brady, Rep. Voy. 

 Challenger, Zoology, vol. 9, 1884, p. 143, pi. 3, figs. 7, 8.— Chapman, Proc-. 

 Zool. Soc. London, 1895, p. 8.— Millett, Journ. Roy. Micr. Soc, 1898, 

 p. 262, pi. 5, fig. 8.— Dakin, Rep't. Pearl Oyster Fish. Ceylon, 1906, p. 

 228. — Heron-Allen and Earland, Trans. Zool. Soc. London, vol. 20,. 

 1915, p. 551; Journ. Linn. Soc. Zool., vol. 35, 1924, p. 602. 

 Biloculina denticulata (H. B. Brady), var. sfnoZoia (H. B. Brady), Cushman, 

 Bull. 71, U. S. Nat. Mus., pt. 6, 1917, p. 80, pi. 33, figs. 2, 3; Bull. 100, 

 U. S. Nat. Mus., vol. 4, 1921, p. 477, pi 98, figs. 2 a-c; Publ. 311, 

 Carnegie Instit. Washington, 1922, p. 78; Publ. 342, 1924, p. 70. 

 Variety differing from the typical in the addition of a surface 

 ornamentation consisting of a series of costae on the lower half of the 

 penultimate chamber, occasionally on the ultimate also. 



This variety is usually found with the typical form of the species. 

 The figured specimen represents an extreme form, not typical, m 



