688 
THE YOYAGE OF H.M.S. CHALLENGER. 
There can be little doubt that Terquem’s Planorbulina eoccena, obtained from the 
Eocene formations of Paris, belongs to the present species; its close affinity is 
admitted by the author. 
Pulvinulina auricula, Fichtel and Moll,, sp. (Pl. CVI. fig. 5, a.b.c .)„ 
Nautilus auricula, var. a, Fichtel and Moll, 1803, Test. Micr., p. 108, pl. xx. figs, a.b.c. 
Valvulina excavata, d’Orbigny, 1839, Foram. Canaries, p. 137, pl. i. figs. 43-45. 
Pulvinulina auricula, Barker and Jones, 1865, Phil. Trans., vol. civ. p. 393. 
„ contraria, Reuss, 1870, Sitzungsb. d. k. Ak. Wiss. Wien, vol. lxii. p. 490, No. 3; — 
Schlicht, 1870, Foram. Pietzpuhl, pl. xxii. figs. 10-13. 
Valvulina ovalis, Terquem, 1882, M6m. Soc. geol. France, ser. 3, vol. ii., Mtm. III., p. 103, 
pl; XI. fig. 10. 
Pulvinulina oblonga, Williamson, sp. (PL. CVI. fig: 4, a.b.c.). 
Nautilus auricula, var. /3, Fichtel and Moll, 1803, Test. Micr., p. 108, pl. xx. figs, d.e.f. 
Rotcdina oblonga, Williamson, 1858, Rec. For. Gt. Br., p. 51, pl. iv. figs. 98-100. 
Pulvinulina repanda, var. auricula, Parker and Jones, 1862, Introd. Foram., Appendix, 
p. 311. 
The typical Pulvinulina auricula has an elongate-ovate test, the two lateral faces of 
which are nearly equally convex ; the oblong contour being the result of the very rapid 
increase in length of the successive chambers. The septal face of the final segment is 
inflated, and the inner margin is generally extended so as to form a sort of flap, which 
overlaps and conceals the inferior umbilical ends of the earlier segments. The periphery 
of the test is entire, the sutures being marked by fine lines, without either limbation or 
depression. 
The variety named by Fichtel and Moll Nautilus auricula, var. /3, and by Williamson 
Rotalina oblonga, differs from the foregoing in having somewhat ventricose segments, 
slightly depressed and faintly limbate sutures, and subcarinate periphery. Specimens in 
which these features are well marked are readily distinguished from the more typical 
forms, nevertheless it is impossible to separate them as a group, except by comparative 
and very variable characters. 
To judge from living specimens (Pl. LIV. fig. 18), Reuss’s original drawings of Rotalia 
contraria (Zeitschr. d. deutsch. geol. Gesellsch., 1851, vol. iii. pl. v. fig. 37) represent a 
somewhat anomalous Rotaliform modification of the genus Bulimina ; whilst the forms 
figured by von Schlicht ( loc . cit.), to which the same specific name has been assigned, 
appear to be true Pulvinulince of the “ auricula ” type. 
The Rotalina brongniartii of d’Orbigny (For. Foss. Vien., p. 158, pl. viii. figs. 22-24), 
and the Valvulina cordiformis of Costa (Atti del! Accad. Pont., vol. vii. p. 262, pl. xxi. 
