66 BULLETIN 104, UNITED STATES NATIONAL MUSEUM 



Chapman, Biol. Res. Endeavour, vol. 3, pt. 1, 1916, p. 32. — Heron-Allen 



and Earland, Trans. Zool. Soc, vol. 20, 1915, p. 717; Trans. Linn. Sec. 



London, vol. 11, 1916, p. 277; Journ. Roy. Micr. Soc, 1916, p. 52.— 



SiDEBOTTOM, Joum. Roy. Micr. Soc, 1918, p. 260. — Cushman, Proc. 



U. S. Nat. Mus., vol. 56, 1919, p. 631; Bull. 100, U. S. Nat. Miis., vol. 4, 



1921, p. 342. — Heron-Allen and Earland, British Antarctic Exped., 



Zoology, vol. 6, 1922, p. 218; Journ. Roy. Micr. Soc, 1924, p. 180; Journ. 



Linn. Soc Zool., vol. 35, 1924, p. 637. — Cushman, Bernice P. Bishop 



Museum, Bull. 27, 1925, p. 134. — Hanzawa, Jap. Journ. Geol. Pal., vol. 



4, 1925 (1926), p. 44.— Ntjttall, Quart. Journ. Geol. Soc, vol. 84, 1928, 



p. 101, pi. 7, figs. 9, 10. — Casasnovas, Not. Y Res. Instit. Esp. Ocean., 



ser. 2, No. 29, 1928, p. 8. 

 Pulvinulina elegans, var. partschiana Chapman, Rep't. British Antarctic 



Exped., Geology, vol. 2, 1916 (1917), p. 70, pi. 5, fig. 40. 

 E-pistomina elegans Martinotti, Boll. R. UfFicio geol. Ital., vol. 51, 1926, 



p. 3.— Cushman, Journ. Pal., vol. 1, 1927, p. 166, pi. 26, figs. 3, 4; Contr. 



Cushman Lab. Foram. Res., vol. 3, 1927, p. 182, pi. 31, figs. 1-6; pi. 32, 



figs. 1-8. 

 Epistomina partschiana Clodius, Archiv. Ver. Freunde Mecklenburg, 75 



Jahr., 1922, p. 142. — Cushman, Bull. Scripps Inst. Ocean., Tech. Ser., 



vol. 1, No. 10, 1927, p. 163, pi. 5, figs. 4, 5. 

 Epistomina bradyi Galloway and Wissler, Journ. Pal., vol. 1, 1927, p. 60, 



pi. 10, fig. 1. 

 Epistomina flinti Galloway and Wissler, Journ. Pal., vol. 1, 1927, p. 61, 



pi. 9, fig. 16. 



Test biconvex, either with the sides nearly equally convex or the 

 ventral side more stongly so especially in the microspheric form, 

 periphery rounded or in small specimens m.ore acute; chambers usually 

 distinct, typically 7 to 9 in the m.egalospheric form, increasing to as 

 many as 14 in the largest microspheric specimens; sutures distinct, 

 limbate, but not raised, on the dorsal side strongly oblique, on the 

 ventral side obliquely radial ending at the center in an umbonate 

 mass; wall finely perforate, in the thin walled specimens often showing 

 a complex pattern of thickenings, in thick walled specimens opaque; 

 aperture usually narrow on the ventral side at the base of the last- 

 formed chamber toward the periphery with a supplementary aperture 

 in the axis of coiling, parallel to the peripheral margin and just ventral 

 to it, elongate. Diameter up to 2 mm. in microspheric specimens. 



This is one of the few species of the Rotaliidae that is a characteristic 

 one of Globigerina-ooze. It is widely distributed in the Albatross 

 dredgings as the table shows. This very wide distribution suggests 

 that it may possibly be pelagic in its early stages. Our figured speci- 

 men shows the early stage with thin walls and peculiar pattern due 

 to thickenings of the wall. The microspheric forms become very 

 thick walled and grow to considerable size. The wall is in layers 

 which easily break away, and as a result many of the specimens are 

 imperfect. The thin lip along the peripheral margin also forms a line 

 of weakness and is easily broken away. 



