12 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Earland, Journ. Quekett Micr. Club, ser. 2, vol. 9, 1905, p. 220.— 

 MiLLETT, Rec. Foram. Galway, 1908, p. 6. — Cushman, Proc. Boston 

 Soc. Nat. Hist., vol. 34, 1908, p. 29, pi. 5, fig. 3.— Sidebottom, Mem. 

 Proc. Manchester Lit. Philos. Soc, vol. 52, 1908, p. 9. — Heron-Allen 

 and Earland, Journ. Roy. Micr. Soc, 1909, p. 441. — Sidebottom, Mem. 

 Proc. Manchester Tit. Philos. Soc, vol. 54, No. 16, 1910, p. 24. — Heron- 

 Allen and Earland, Proc. Roy. Irish Acad., vol. 31, pt. 64, 1913, p. 

 109, pi. 9, fig. 11. — Pearcey, Trans. Roy. Soc. Edinburgh, vol. 49, 1914, 

 p. 1026.— Cushman, Bull. 71, U. S. Nat. Mus., pt. 5, 1915, p. 9, pi. 7, 

 fig. 1. — Heron-Allen and Earland, Journ. Roy. Micr. Soc, 1916, 

 p. 49; Trans. Linn. Soc. London, vol. 11, 1916, p. 269. — Cushman, Contr. 

 Canadian Biol., 1921 (1922), p. 11. — Hofker, Flora en Fauna de Zuider- 

 zee, Protozoa, 1922, p. 134, fig. 13 a-d (in text). — Casasnovas, Not. 

 Y. Res. Instit. Esp. Ocean., ser. 2, No. 29, 1928, p. 6. — Palmer, Journ. 

 Pal., vol. 3, 1929, p. 306. — Cushman, Contr. Cushman Lab. Foram. Res., 

 vol. 6, 1930, p. 15, pi. 3, figs. 5, a-c. 



Test usually free, conical, or plano-convex ; early portion composed 

 of chambers spirally arranged, later ones elongating and finally 

 becoming annular or nearly so in the last-formed portion of the 

 test; chambers partially divided by internal septa which are visible 

 from the exterior, showing clearly in the last-formed chambers from 

 the ventral side; somewhat umbilicate ventrally; walls comparatively 

 thin and translucent; aperture somewhat elongate situated at the 

 inner border of the chamber. 



Diameter up to 0.65 mm. 



This species is fairly common, especially on the coasts of Western 

 Europe and in the Mediterranean, and it occurs on the eastern and 

 western coasts of North America, but in the Indo-Pacific region in 

 general appears to be replaced by P. advena Cushman which is 

 a somewhat more specialized species having finer but more complex 

 lobes in the chambers. 



The earliest stages of the microspheric form of Patellina corrugata 

 may be easily mistaken for a small somewhat conical Spirillina. 



Genus DISCORBIS Lamarck, 1804 



Discorbis Lamarck, Ann. Mus., vol. 5, 1804, p. 183. — Cushman, Bull. 



71, U. S. Nat. Mus., pt. 5, 1915, p. 10; Special Publ. No. 1, Cushman 



Lab. Foram. Res., 1928, p. 270. 

 Rosalina d'Orbigny, Ann. Sci. Nat., vol. 7, 1826, p. 27! (genotype, by 



designation, Rosalina globularis d'Orbigny). 

 Turbinulina (part) d'Orbigny, 1828. 

 Allotheca Ehrenberg, Abhandl. k. Akad. Wiss. Berlin, 1841, p. 407 (geno- 



holotype, Allotheca megathyra Ehrenberg). 

 Phanerostomum Ehrenberg, Abhandl. k. Akad. Wiss. Berlin, 1841, p. 409 



(genotype, by designation, Phanerostomum integerrimum Ehrenberg). 

 Platyoeciis Ehrenberg, Mikrogeologie, 1854, pi. 30, fig. 28 (genoholotype, 



Plaiyoecus squama Ehrenberg). 

 Aristeros'pira Ehrenberg, Monatsber. k. preuss. Akad. Wiss. Berlin, 1858, 



p. 11 (genotype, by designation, Aristerospira isoderma Ehrenberg). 

 Discorbina Parker and Jones, in Carpenter, Parker and Jones, Introd. 



Foram., 1862, p. 203 (genotype, Rotalia (Trochulina) turbo d'Orbigny). 



