48 THE PALEONTOLOGY OF MINNESOTA. 
[Nonionina 
pores on the face of the terminal segment. The septa are double, and the skeleton 
is furnished with a system of canals the general features of which are analogous to 
that of Nummulites.” 
Locality. Meeker county, Minnesota. Specimens of this variety have heen identified in the Eocene 
at Jackson, Mississippi. 
Sub-Family 2. POLYSTOMELLIN 4. 
NONIONINA, d’Orbigny. 
Nonronina scapHa Fichtel and Moll. Sp. 
PLATE E, FIGS, 35, 36 
Nautilus scapha FICHTEL and MOLL, 1803. Test. Micr., p. 105, pl. xix, figs. d-f. 
Nonionina sloani VORBIGNY, 1839. Foram. Cuba, p. 68, pl. vi, fig. 18. 
Nonionina scapha PARKER and JONES, 1860. Ann. and Mag. Nat. Hist., ser. 3, vol. v, p. 102, No. 4. 
Nonionina boneana Reuss, 1863. Bull. Acad. Roy. Belg., ser. 2, vol. xv, p. 156, pl. iii, figs. 47, 48. 
Nonionina scapha BRADY, 1865. Nat. Hist. Trans., Northd. and Durham, vol. i, p. 106, pl. xii, figs. 
10, a, b. 
Polystomella crispa var. (Nonionina) scapha PARKER and JONES, 1865. Phil. Trans., vol. clv, p. 404, pl. 
xiv, figs. 37, 38; pl. xvii, figs. 55, 56. 
Nonionina scapha BRADY, 1884. Report on Foram., H. M.S. Challenger, Zool., vol. ix, p. 730, pl. cix, 
figs. 14, 15 and 16? 
“Testa spiralis involuta subovalis, utrinque wmbilico impresso parvo, lateribus 
mediocriter convexis (minus quam in precedente Non. faba, sed magis quam in 
sequente N. crepidula); dorso obtuso; articulis duodecim conspicuis, subelevatis, 
levibus; dissepimentis antrorsum mediocriter convexis, non omnibus ex centro 
radiantibus, sed tribus ultimis parum extravagantibus ; plano orali oblongo—sub- 
cordato convexo ; orificio (in specimine obvio unico partim detrito) prassumtive, uti 
in aliis similibus, lineari parabolice arcuato.” 
Shell spiral, involute, suboval, slightly umbilicate on both sides, sides moderately 
convex (less than in the preceding N. faba, but more than in the following N. crepi- 
dula), back obtuse ; with twelve conspicuous chambers ; subelevate, smooth ; par- 
titions moderately convex anteriorly, not all radiating from the centre, the last three 
a little eccentric ; the plane of aperture oblong, subcordate, convex ; aperture (in 
specimen figured somewhat worn away) probably as in similar species, linear para- 
bolic arcuate. 
The following description will make the above more comprehensible. 
“The test of Nonionina scapha is of elongate oval contour, and more or less 
compressed, the peculiar form being due to the rapid increase in size of the later 
segments. This increase is not merely in the length of the chambers, but also in 
their thickness. The peripheral edge of the later portion of the test is obtuse or 
rounded, and the exposed septal face of the final segment varies from oval to more 
or less cordate.” Brapy, loc. cit. 
Locality. South Chicago, Illinois. 
