50 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 6 



Test adherent, hemispherical or at least strongly convex, base flat- 

 tened or irregular to conform to the surface to which it is attached ; on 

 a narrow base the test is usually somewhat elongate in the direction of 

 the length of the attachment; chamber single, usually undivided; wall 

 thick, composed of sand grains or fine amorphous material with much 

 calcareous cement, outer surface somewhat uneven, interior fairly 

 smooth; aperture simple, circular, elliptical, or crescentiform, one or 

 two, at either end near the base; color grayish white. 



Diameter, not usually exceeding 1.00 mm. 



This widely distributed species is very rare in our material having 

 been found at but a single station : 2067. 



Distribution. — Fraile Bay, Lower California, Mexico, in 10 fms. 



Family Hyperamminidae 



Genus HYPERAMMINA H. B. Brady, 1878 



Hyperammina elongata H. B. Brady ( ?) 



A very few fragmentary specimens may belong to this rather widely 

 distributed species but no complete specimens were found. 



Distribution. — San Pedro Nolasco Island, Lower California, Mexico, 

 in 60 fms. ; Point Escondido Bay, Lower California, Mexico, in 34 fms. 



Hyperammina friabilis H. B. Brady 

 Plate 2, Figs. 7-9 



Hyperammina elongata H. B. Brady (part), Ann. Mag. Nat. Hist., 

 sen 5, vol. 1, 1878, p. 433; Quart. Journ. Micr. Sci., vol. 19, 1879, 

 p. 32. 



Hyperammina friabilis H. B. Brady, Rep. Voy. Challenger, Zoology, 

 vol. 9, 1884, p. 258, pi. 23, figs. 1-3, 5, 6.— Goes, Kongl. Svensk. Vet. 

 Akad. Handl., vol. 25, no. 9, 1894, p. 17, pi. 4, fig. 59; Bull. Mus. 

 Comp. Zool., vol. 29, 1896, p. 22.— Flint, Rep. U. S. Nat. Mus., 1897 

 (1899), p. 269, pi. 10, fig. 1.— Rhumbler, Arch. Prot., vol. 3, 1903, 

 p. 258, figs. 99^, b (in text).— Cushman, Bull. 71, U. S. Nat. Mus., 

 pt. 1, 1910, p. 62, fig. 76 (in text). — Pearcey, Trans. Roy. Soc. Edin- 

 burgh, vol. 49, 1914, p. 1004. — Heron-Allen and Earland, Trans. 

 Linn. Soc. London, vol. 11, pt. 13, 1916, p. 220. — Cushman, Bull. 104, 

 U. S. Nat. Mus., pt. 1, 1918, p. 75, pi. 29, figs. 1-3; Bull. 100, vol. 4, 

 1921, p. 54, pi. 3, fig. 4. — Lacroix, Bull. Instit. Oceanographique, no. 



