Foraminifera and a TtiBicoLOtis Worm from the Permian of the 
North-West Division of Western Australia. 103 
Ammodiscus nitidus, sp. nov. 
Plate T., figs, la, h. 
Test small, free, planospiral, composed of a minute proloculus and an 
■elongate tubular chamber, almost semi-csrcular in section and slowly increasing 
in diameter, often transversely ridged, number of whorls usually 7 or 8, each 
whorl overlapping to a considerable extent its precedessor ; spiral sutiire only 
slightly depressed ; wall thin for the genus, composed of very small f[uart>! 
grains with little visible cement ; shell suiTace comparatively smooth ; aper- 
ture semicircular, forme<l by tlie open end of the tube. 
Diameter of holotypo, O-Omm. ; thickness, O-lmm. 
Holotype from Sample 8 {Lingula beds). 
There are over 50 specimens. The smoothly-finished, thin shell wall 
Rnd constrictions in the tubular chamber have led to the suspicion tliat the 
specimens are siliceous replacements of a species of Corfiuspira or Spirillina. 
The surface of the test, however, absorbs water readily when it is moistened 
and, in thin section, the shell wall is seen to include quartz grains of different 
sizes. -Both of these characters indicate that the specimens are referable to 
the genus Amniodiscus. 
The central portion of the shell of A. nitidus is very thin and is often 
broken away. In many specimens the tube is regularly constricted at close 
intervals, but the constrictions are so slight as to bo only faintly visible. These 
features and the smoothly-finislied surface of tiie test will enable the species 
to be distinguished from any other. A, bradymis (Spandol), as described 
and figured by Paalzow (1935, p. 29, pi. iii., figs. 5, 6) from the Upper Permian 
(Zechstoin) of Germany is perhaps nearest to A. nitidus, but the whorls do 
not overlap as in the Western Australian species. 
Gerais GLOMOSPIRA Ilzehak, I88H. 
Glomospira adhaerens, sjn nov. 
Plate I., fig. 2. 
Test usually attached, early portion coiled plauospirally after which the 
tubular chamber increases in diameter and winds rather irregularly over the 
early portion to form a subglobular heap, fuially in some specimens extending 
as a straight or curved tube adherent to the object of attachment ; \^'all 
composed of fine ([uartz grains firml^^ cemented to form a eomparatix^cly 
smooth surface ; aperture forme<l by the open end of the tube. 
Diameter of closely coiled specimens up to 1-25 mm., with tube diameter 
of 0*25 mm. at end of tube. 
Holot\q^{’ from Sample fi {Lingida beds). 
Examples of tins species are common in tiie material from the Lingula 
beds. They usually occur attached to the tests of H yperamniinoides acicula, 
but there are a few small free specimens, I have referred this spetaes to the 
genus Glomospim as the plan of growth, except for the attaclied character 
of most of the .specimens, is similar to that found in this genus. It may be 
added that the Recent G. gordialis (Jones and Parker), although typicallv 
a free form, occurs in the attached condition. 
