48 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



Test free, about twice as broad as high, planoconvex in side view, 

 dorsal side strongly convex, ventral side flattened and slightly concave 

 in the middle, circular in outline ; wall very thin, composed of fine sand 

 grains firmly cemented, with much chitin; aperture circular, with a 

 simple flattened tooth or somewhat radiate with several triangular 

 teeth. 



Diameter 0.20-0.25 mm; height 0.15-0.18 mm. 



Our specimens apparently are identical with this species described 

 from the Miocene of Florida. Specimens are fairly numerous at some 

 of our localities but due to its very small size may easily be overlooked. 

 Localities: 510, 539, 546a, 582, 583. 



Distribution. — Olif Ecuador from 10 to 20 fms. 



Genus PELOSINA H. B. Brady, 1879 



Pelosina variabilis H. B. Brady 



Plate 2, Fig. 5 



Pelosina variabilis H. B. Brady, Quart. Journ. Micr. Sci., vol. 19, 

 1879, p. 30, pi. 3, figs. 1-3; Rep. Voy. Challenger, Zoology, vol. 9, 

 1884, p. 235, pi. -26, figs. 7-9.— Flint, Rep. U. S. Nat. Mus., 1897 

 (1899), p. 266, pi. 4, fig. 1.— Rhumbler, Arch. Prot., vol. 3, 1903, p. 

 239, fig. 74 (in text). — Chapman, Trans. New Zealand Inst., vol. 38, 

 1905, p. 83.— Cushman, Bull. 71, U. S. Nat. Mus., pt. 1, 1910, p. 47, 

 fig. 52 (in text). — Heron-Allen and Earland, Trans. Linn. Soc. Lon- 

 don, vol. 11, pt. 13, 1916, p. 218.— Cushman, Bull. 104, U. S. Nat. 

 Mus., pt. 1, 1918, p. 53, pi. 22, figs. 1-4.— Heron-Allen and Earland, 

 British Antarctic Exped., Zoology, vol. 6, 1922, p. 77. — Chapman, 

 Union of So. Africa, Fish. Mar. Biol. Surv., Rep't no. 3, for 1922 

 (1924), p. 6. — Wiesner, Deutsche Siid-Polar-Exped., vol. XX, Zool., 

 1929, p. 84, pi. 6, fig. 69. — Lacroix, Bull. Instit. Oceanographique, no. 

 545, 1929, p. 7, text fig. 10.— Earland, Discovery Rep'ts, vol. VH, 

 1933, p. 55; vol. X, 1934, p. 55. 



Test irregular, consisting of a single fusiform chamber or of two or 

 three independent chambers, irregularly associated, but usually at- 

 tached near the apertural end of the main chamber; wall thick, irregu- 

 lar but usually fairly smooth composed of fine mud with more or less 

 irregularly placed foreign bodies at the surface; basal layer thin and 

 membranaceous, chitinous, sometimes extended into a tubular neck at 

 the apertural end ; chamber in general conforming to the shape of the 



