5 
IV -DESCRIPTION OF TIIE FORAMINIFERA. 
Family — MILIOLIDZE. 
Gen us — N UB EC UL AB I A, Def ranee. 
Nubeculaiua stephensi, II owchin. 
(Plate I, Figs. 1 and 2 ; Plate 1LT, Figs. 13 and 14; Plate IV, Figs. 1 and -4.) 
Cornuspira, n. sp. Jones, 1882, Cat. Foss. Foratn. Brit. Mus. p. 6. 
Nubecularia lucifuga , Defr., var. stephensi, Howchin, 1894; Rep. Austral. Assoc. Adv. Sci., 
1893 Meeting, p. 345, PI. Xa, XIa. 
Observations . — The chief differences between the present form, which 
we now prefer to regard as a distinct species, and N. lucifuga , lie in the fairly 
thin uniform character of the shell-wall of the former, and their tendency, in 
the shorter individuals, to increase on a milioline plan. N. stephensi was 
protean in its habit like N. lucifuga , sometimes coiling itself around a spicule, 
growing in chevron fashion over an angular fragment to which it had become 
attached, or even nestling in the crypts of polyzoa. These last-named 
examples usually have a very delicate shell-structure. Individuals of this 
species are difficult to separate from the rock. A figure of one of the more 
perfect specimens is shown in PI. 1, Eig. I. Another example, giving a 
sectional view of the test embedded in the rock, is shown in PI. I, Fig. 2. 
This shows a rude spiral arrangement, and calls to mind certain thin-tested 
Haplophragmia. Many of the thin rock-slices contain an abundance of the 
tests of this species, which is by far the commonest foraminifer in the lime- 
stones. A fine example of a test adherent to a flat surface is figured on PI. 3, 
Eig. 13. In Eig. 14 of the same plate, a small, delicate-shelled example is 
seen nestling in the zooecium of a polyzoan. 
Occurrence. — N. stephensi is very abundant in the calcareous rock 
from Pokolbin ; it was also found in the washings from Pokolbin No. 2 
(Mount Vincent), and Pokolbin No. 3. 
This foraminifer is also extremely abundant in the dark grey argill- 
aceous limestone of the Piper River beds in Tasmania. A specimen of this 
rock in the British Museum (Natural History), London, is registered by 
Prof. T. Bupert Jones, as follows, “ P. 1129, dark grey Carboniferous 
lime-stone, full of a contorted porcellanous Eoraminifer (new species of 
Cornuspira). ” 
