200 
tion between the substance of the test walls and the confused 
shelly deposits,or even in some cases where the well-defined walls 
terminate and the irregular deposits begin. It would seem that 
the habit of the genus to produce secondary shell substance and 
irregular chamberlets has in the present species found its extreme 
development. The reticulated superficial layer appears to be a 
rudimentary form of “the external or reticulated chamber-layer,” 
_which is more definitely developed in the European Cretaceous 
species, P. lenticularis, Carter. The range of variation in the 
external form of this species is very considerable ; at times it 
forms a symmetrical cone, but more frequently the habit of 
growth is marked by sudden inflation or contraction of the test 
as shown in fig. 9. 
The geological range of the genus, so far as known, dates from 
the Carboniferous Limestone,* but it was during the Cretaceous 
and Eocene periods that it reached its greatest development, not 
only in size, but in the range of .its species and the complex 
structure of its investment. Since the early Tertiary period it 
has gradually declined until in the present day it is only repre- 
sented by one or two minute and degenerate species. 
About a dozen examples were found in No. 2 Bore at Hergott, 
at a depth of 140-150 feet. 
It is with much pleasure that I name the present species after 
J. W. Jones, Esq., Conservator of Water, under whose direction 
this very successful bore was carried out, and to whose courtesy 
and ready assistance I have been indebted for the material ob- 
tained from this as well as other Government borings. 
EXPLANATION OF PLATE X. 
Figs. 1-3.—CorNUSPIRA SCHLUMBERGI, sp. nov. 
' 1, Lateral aspect. 
2. Transparent, transverse section showing lamination of test walls. 
3. Transparent, horizontal section showing irregular coiling of the 
chambers. 
Figs. 4-6.—FRONDICULARIA WooDWARDI, sp. nov. 
4. Opaque, lateral aspect. a. End view of same. 
5. Opaque, lateral aspect of a short and broad variety. 
6. Transparent, horizontal secticn. 
Figs. 7, 8.—Noposaria IRWINENSIS, sp. nov. Lateral aspects of two 
average specimens. 
Figs. 9-11.—PATELLINA JONESI, sp. nov. 
9. Lateral view. 
1U. Transparent, vertical section. 
11. Transparent, transverse section. 
Figs. 12, 13.—HAPLOPHRAGMIUM AUSTRALIS, sp. nov. 
12. Few-chambered specimen. 
13. Example showing rectilineal growth. a. Oral view of same. 
* Carboniferous Foram., by W. Howchin, Jour. Roy. Micro. Soc., Aug., 
1888. 
