THE FORAMINIFERA OF LORD HOWE ISLAND. 639 
juxtaposed groups. The finer material provided an abuuciant supply o£ 
imniature specimens, which when mounted in balsam exhibited a large 
primordial chamber with chitinous lining, followed by a single coil of about 
twelve gloliular cliambers of gradually increasing size, in one plane. The 
chambers in the convolulion are separated by dense, solid shell-substance. 
On completion of rather more than a single convolution, the chambers 
become less spherical and are irregularly heaped over their predecessors as 
in Gypsina. The spinous processes, periiorated by secondary canals, are seen 
to originate from a solid layer of shell-substance on the outer wall of the 
primary coil. The general colour of the specimen is much less conspicuous 
than in most " Tinoporus gatherings'' which have been examined. The 
species generally gives a yellowish-orange tint to the sands in which it is 
predominantj but the Lord Howe specimens are nearly white. 
The complicated synonymy of this organism is fully discussed in the 
papers quoted above, and in others referred to in those papers. 
POLTTRBMA RisSO. 
187. POLYTRBMA MINIACEUM (Pa//a«). 
Millepora miniacea Pallas, 1766, Elenchus Zoophytonim, p. 251. 
Polytrema miniaceimi Brady, 1884, FC. p. 721, pi. 100, figs. 5-9: pi. 101. 
fig.l. 
Heron-Allen & Earland, 1922, TN. p. 221, pi. 8 ; 1922, 
EGA. p. 139, pi. 2 (numbered 1). 
(Juriousl)' rare. The specimens call for no particular comment. A few 
specimens of the free early stage were observed. 
188. POLYTRBMA MINIACEUM, var. ALBA Carter. 
Polytrema niiniaceuw, var. album Carter, 1877, CB. p. 213, pi. 13. figs. 14, 15. 
„ alba Brady, 1884, FC. p. 721, pi. 101. figs. 2, 3. 
„ „ Heron-Allen & Earland, 1922, TN. 226. 
As usual, rarer than the type, but unmistakable. 
Family NUMMULINID^. 
Sub-family PolystomelliNjE. 
NONIONINA cTOrhigny. 
189. NoNiONiNA DEPRESSULA {Wolher Sf Jacob). 
Nautilus depressulus Walker & Jacob, 1798, AEM. p. 641, pi. 14. fig. 33. 
• Nonionina depressula Brady, 1884, EC. p. 725, pi. 109. figs. 6, 7. 
Heron-Allen & Earland, 1914-15, EKA. p. 730. 
Very rare and minute. 
