196 
In the lamination of the shell-walls, the present species shows 
a closer likeness to the genus Planispirinu than Cornuspira, but 
the absence of segmentation in the chamber cavity fixes its 
position with the last-named genus. 
Representatives of this genus have been observed in most 
geological formations of Europe, dating from the Lias, and it 
also occurs in rocks of Permo-Carboniferous age in Tasmania.* 
It affords me much pleasure to associate the name of Mons. 
Schlumberger of Paris with this interesting species, not only 
because the transparent sections of this form now figured were 
kindly supplied by this eminent specialist, but the author has 
been laid under repeated obligation for services he has cheerfully 
rendered towards the working out and determination of obscure 
species. 
Noposaria IRWINENSIS, sp. nov. Pl. x., fig. 7-8. 
Ref.—Nodosaria species, Report of Fifth Meeting of the 
Aus. Ass. for Adv. of Science, Adelaide, 1893, p. 366. 
Test elongate, straight or very slightly arcuate, tapering. Seg- 
ments about eight in number. The shell either slightly inflated 
near the centre or gradually increasing in size. Chambers of greater 
width than length. Sutural lines straight,thick, and slightly 
depressed. Surface of test ornamented with numerous, closely 
set, longitudinal, and continuous coste. 
Length, giz In. 
This is a Nodosarian of very short length, narrow chambers, 
banded sutures and finely costated surface. It does not appear 
to agree with any previously described species. <A finely ribbed 
Nodosarian shell has been figured from the Permian of Durham 
by Mr. T. Rupert Jonest and the late Dr. H. B. Brady,t and 
referred by the latter to NVodosaria (Dentalina) multicostata, 
d@Orb. But this is a very different species from the one now 
described, being markedly dentaline, with subglobular chambers 
that rapidly increase in size with the stages of growth. Messrs. 
Jones and Parker have also figured§ two fragments of a costated 
Nodosarian from the Triassic beds of Chellaston, near Derby, 
which are referred by the author to JV. lineolata, Reuss. This 
is, however, a much larger shell than the one found in the R. 
Irwin beds, and has elongated elliptically-shaped chambers. The 
broad banded constrictions which mark the septation in 
* Op. cit., vol. V., p. 344. 
+ Dentalina King gui, Monograph of the Sou el Fossils of England, by 
W. King, Palezontog, Soc., 1850, pl. vi., figs. 2 
{Monograph of Carboniferous and Permian Foraminifera, by H. B. 
Brady, Paleontog. Soc., 1876, pl. x., fig. 19. 
§ Quart. Jour. Geo. Soc., vol. XVI. (Nov., 1860), pl. xix., figs. 11, 12. 
