TROPICAL PACIFIC FORAMINIFERA OF "ALBATROSS" 45 



Genus NONIONELLA Cushman. 1926 



Nonionella Cushman, Contr. Cushman Lab. Foram. Res., vol. 2, p. 64, 1926. 

 Synonym: Nonionina (part) of authors. 



Genoholotype. — Nonionella miocenica Cushman. 



Test siibtrochoid, the dorsal side only partially involute, ventral 

 side completely so, close coiled; chambers, especially in the adult, 

 inequilateral, the ventral side developing a distinct elongate lobe 

 at the umbilical end, which covers the umbilicus itself; wall calcare- 

 ous, finely perforate; aperture at the base of the apertural face of the 

 chamber low and elongate, extending from the peripheral border 

 toward the ventral side. Cretaceous to Recent. 



NONIONELLA AURIS (d'Orbigny) 



Plate 10, Figures 10, 11; Plate 11, Figures la-c 



Valvulina auris d'Orbigny, Voy. Am6r. M6rid., vol. 5, pt. 5, "Foraminiferes," 



p. 47, pi. 2, figs. 15-17, 1839. 

 Nonionella auris Cushman and Kellett, Proc. U. S. Nat. Mus., vol. 75, art. 25, 



p. 5, pi. 1, fig. 9; pi. 2, figs. 2, 3, 1929.— Cushman, Florida State Geol. Surv. 



Bull. 4, p. 38, pi. 7, figs, la-c, 1930. 



Test asymmetrical, slightl}^ trochoid, the spire not raised, periphery 

 in the adult broadly rounded; chambers 9 to 11 in the adult, low and 

 broad, very distinct, slightly inflated, in the adult with the last- 

 formed chamber having an enlarged portion extending over the 

 umbilicus on the ventral side; sutures distinct, depressed, gently 

 curved; wall smooth, polished, very finely perforate; aperture at the 

 base of the last-formed chamber extending from the periphery ven- 

 trally, low and broad. Length, 0.35 mm; breadth, 0.25 mm; thick- 

 ness, 0.1 mm. 



Our specimens are not entirely typical, as the extension of the last- 

 formed chamber on the ventral side is not nearlj^ so well marked as 

 in the types and in the fossil material that has been referred to tliis 

 species. It is rare, being found only at one Albatross station, H3840, 

 latitude 17° 21' S., longitude 149° 15' W., in 1,585 fathoms, at Vavau 

 Anchorage, Tonga Islands, and at Rutavu. 



NONIONELLA TRANSLUCENS, new species 



Plate 11, Figures 2a-c 



Test small, elongate, dorsal side flattened or slightly convex with 

 all the coils visible, ventral side with only the last-formed coil visible, 

 the inner side of the last-formed chambers projecting toward the 

 umbilicus, periphery rounded; chambers distinct, slightly inflated, 

 especially on the ventral side, 9 or 10 in the last-formed coil, of rather 

 uniform shape and increasing only slightly in size as added; sutures 

 distinct, strongly limbate; wall thin, translucent, very finely per- 

 forate, shining; aperture at the ventral margin of the last-formed 



