REPORT ON THE FORAMINIFERA. 
727 
Nonionina pompilioides, Fichtel and Moll, sp. (Pl. CIX. figs. 10, 11). 
“Nautilus Melo ,” Solclani, 1798, Testaceographia, vol. ii. p. 38, pl. viii. fig. z.z. A.B.O. 
Nautilus pompilioides, Fichtel and Moll, 1803, Test. Micr., p. 31, pl. ii. figs. a-e. 
Melonis etruscus, Montfort, 1808, Conchyl. System., vol. i. p. 67, xvii e genre. 
Polystomella etrusca, Defiance, 1824, Diet. Sci. Nat., vol. xxxii. p. 183; — Blainville, Malac. 
p. 389. 
Nonionina umbilicata, d’Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 293, pl. xv. figs. 10-12 ; — 
Modele, No. 86. 
„ melo, Id. Ibid. p. 293, No. 4. 
„ pompilioides, Parker, Jones, and Brady, 1865, Ann. and Mag. Nat. Hist., ser. 3, 
vol. xvi. p. 18, pl. iii. fig. 98. 
The term Nonionina pompilioides takes precedence for the subglobular modification 
of the type. The test is thicker than that of Nonionina umbilicatida, usually of some- 
what smaller diameter, and with rather fewer chambers in the outer convolution ; but 
otherwise it is built on the same compact nautiloid plan. 
Nonionina pompilioides is less common than the immediately allied forms, and so far 
as can be learnt from the Challenger and “ Porcupine ” collections it appears to be almost 
exclusively a deep-water Foraminifer. It has been observed at seven Stations in the 
North Atlantic, the depths ranging between 1000 and 2750 fathoms ; at one in the South 
Atlantic, 2200 fathoms; at two in the Southern Ocean, 1570 and 1950 fathoms; at 
eight in the South Pacific, 1350 to 2421 fathoms ; and at two in the North Pacific, 1850 
and 2250 fathoms respectively. Its occurrence in the Mediterranean and the Adriatic is 
also on record. 
Its earliest appearance as a fossil is about the middle of the Tertiary epoch. It has 
been found in the Miocene deposits of Vienna, Bordeaux, Malta, and Calabria (d’Orbigny, 
Brady, Seguenza) ; and in the later Tertiary formations of Italy and the south-east of 
Spain (Soldani, d’Orbigny, Parker and Jones). 
Nonionina orbicularis, H. B. Brady (Pl. CIX. figs. 20, 21). 
Nonionina orbicularis, Brady, 1881, Denkschr. d. k. Akad. Wiss. Wien, voL xliii. p. 105, pl. ii. 
fig. 5, a.b.; — Ann. and Mag. Nat. Hist., ser. 5, vol. viii. p. 415, pl. xxi. fig. 5, a. b. 
Test subglobular, somewhat compressed, convex or slightly umbonate at the umbilici ; 
peripheral edge round, and faintly lobulated : segments numerous, about ten in the 
final convolution ; sutural lines more or less excavated near the umbilici. Aperture 
arcuate ; either simple, or partially divided by teeth projecting from the upper margin. 
Diameter, about ^g-th inch (0’75 mm.). 
This species resembles Nonionina pompilioides in its subspherical contour, but may 
be distinguished by its larger number of segments and their less regular disposition, as 
well as by the thickened umbilici. The aperture, like that of some of the weaker forms 
of Polystomella, is sometimes notched, or partially bridged over by projecting teeth. 
