149 
off the resin. Ether dissolves the greater portion of the resin, but 
instead of the residual resin being dark brown, as in the case when 
alcohol is used, it is of a golden yellowish colour, and when ignited 
burns away without residue, while that portion extracted by alcohol 
after the ethereal extract has been removed, leaves a small quantity of 
residue. 
The bright yellow resin melts at 85° C. The original resin 
extracted by alcohol melts at 110° C., while the alcoholic residue 
left on removal of the resin soluable in ether does not melt at 140° 
C. It consists partly of inorganic material. As it was present 
in small quantities, its composition could not be determined in 
the small portion of material forwarded. The resin obtained from 
Triodia irritans, R.Br., by ether, in appearance and colour resembles 
that obtained from Vriodia pungens, but it has a lower melting point, 
melting at 63° C. The brown resin obtained by alcohol, corres- 
ponding to that obtained by alcohol from Triodia pungens melts at 
102° C. From the results of the examination of the bodies con- 
tained in the resinous material of Triodia irritans, it was suggested 
that the fat found was artificially introduced ; its presence would lower 
the melting point of the resm. Judging from the appearance of the 
two resins, their colour, odour, melting points, &c., there appears to 
be but little difference in the resins obtained from J'riodia pungens and 
Triodia wrritans, and they may prove to be identical when prepared 
under similar conditions. 
We have so few records of the finding of the Porcupine resin, that 
the following is of interest :—‘“‘ Samples of resinous matter from roots 
of Spinifex, and tunnels made by ants, found here for the first time, 
lying on the surface of the sandy ground between bunches of Spinifex, 
apparently made of sand cemented with some agglutinuous secretion 
of the msect, or what is more probable, the resinous substance 
found at the roots of the Spinifex plants.” (W. 'T. Tietkens’ Explora- 
tion of West Central Australia, in Trans. Roy. Geog. Soc. Vict., viii., 
30). (Report of Horn Expedition to Central Australia, pp. 195 and 
196). 
Sub-tribe u.—Chlorideex. 
72. Cynodon. 74. EHleusine. 
73. Chloris, 75. Leptochloa. 
76. Diplachne. 
72. CYNODON. 
Spikelets one-flowered, awnless, singly sessile in two rows on one 
side of slender spikes, digitate at the end of the peduncle, the rhachis 
of the spikelet articulate immediately above the outer glumes, and 
either not produced beyond the flower or continued into a minute point 
behind the palea. 
Outer empty glumes two, keeled, persistent or deciduous. 
