102 
Walter J. Parr. 
Commonwealth Palaeontological Collection, Canberra, the Western Australian 
Museum, Perth, the Heron-AJlen and Earland Collection in the British Mriseum, 
the Cushman Collection, the New Zealand Geological Surve}^ Museum, and 
in the writer’s own collection. 
ACKNOWLB DGMBNTS. 
The writer gratefully ackjiowledges his indebtedness to Mr. Henry Coley 
and to Dr. C'lirt Teichert for the material examined. Ho also thanks Dr. 
Teichert for his continued assistance in the preparation of the paper. Miss 
Irene Crespin, B.A., the CoTumonwealth Palaeontologist, has kindly furnished 
copies of literatiire M'liicli we 'e uot available in Melbourne and also supplied 
specimens fi*om the Cominonwealth Collection for comparison. The photo- 
graphs illustrating several of tht‘ species have, through the courtesy of Pro- 
fessor M \y. 8k(^ats, been taktai by ^Tr. J. S. Mann in the Geology Department 
of the Hni\‘ersity of Melbourrui. 
DESCRIPTION OF THE SPECIES. 
Phylum PROTOZOA. 
Order FORAMINIFERA. 
FAMILY AMMODISCIDAE. 
SUB-FAMILY AMMODISCINAE. 
Genus AMMODISCUS Hcnss, 1861. 
Ammolissus wanla^eesnsis, sp. now 
Plato IF., fig. 1. 
Test large, free, planospiral, composed of a small globular prolocidus, 
followed by a long undivided tubular chamber closely coiled in a single plane, 
the tube fairly thick-walled, almost circular in section and slowly increasing 
in diameter as it lengtheins ; number of whorls usually 6 or 7 ; spiral suture 
strongly depressed ; wall coarsely arenaceous with a rough surface and little 
visible cement : aperture formed by the rounded open end of the chamber. 
Diameter of test usually about 6 mm. ; thickness, 0.6 nun. 
Holotype from SaTupk^ 6 {Jjingida beds). 
The exceptionally !arg(' si/.(‘ (d' tin’s species (6 mm.) makes it a conspicuous 
object wherever it occurs. Palaeozoic snecies A mmodisc}iS are usually small 
and the writer is not ac()uaint(Ml with any other with a diameter of more than 
1 mm. A. tvandageecnsis inay bo compared with A. ser:»iconst rictus, var. 
regidaris Waters, from the l^ennt-yK anian of Oklahoma and Texas, U.S.A. 
The American form is less than oiu'-sixth of the size of the Western Austialian 
species, which also difl'ors in its use of broken sponge spicules with tjuartz 
sand to fonn its test, and in its proportionately smaller proloculus. It is sel- 
dom that speci(*s of Ann-.odiscus inemporate spicules in the shell wall, but in 
A, wandugcccnsis they form a large part of the material iis('d. A peculiar 
feature of many of the specimens is that the spicules ha\'e been leached out 
leaving numbers of short cylindrical cavities in varying planes in the shell wall. 
The occurrence of siliceous replacements of molluscan shells has already been 
mentioned ; possibly the silicia ^vas derived from these spicules. 
