(F.v.M., in Fragm., ii. 43, 1860.)

Systematic. - A large tree reaching in favourable situations a height of 120 feet, from 4 to 6 feet in diameter at the base, and as much as 60 feet to the first branch. The average size, however, is about 80 feet in height. The bark is smooth, and after the outer layers have been shed, has a yellow-white or yellow-blue, piebald appearance. Abnormal leaves alternate, sub-rotund or ovate, short petiolate, paler underneath, about 2 inches long, and 1 1/2 inch wide. Normal leaves lanceolate, thick, shining, about 5 inches long and 1 inch wide; underside paler in colour; intramarginal vein somewhat removed from the edge, lateral veins prominent, inclined at about 450 to the mid-rib. Oil glands not conspicuous. Flowers borne in umbels of four to sixteen, usually below the leaves, the common peduncle about 1/2 inch long. Calyx tube wrinkled, bell-shaped, 4 lines long, tapering to a short pedicel; operculum hemispherical, bluntly pointed.

Fruit. - Shaped like an urn or almost similar to an egg with one end cut off, ribbed longitudinally ; rim narrow; valves deeply inserted; about 6 lines long, 4 lines broad.

These fruits in general shape might be classed with E. calycogona, but the ribs are much less pronounced and the surface not so shining, nor are they so contracted below the rim.

Habitat. - Victoria, South Australia.

REMARKS.-Mueller, when describing this Eucalyptus in 1860, gave it this name, which was acknowledged by Bentham in his "Flora Australiensis," vol. iii, p. 218 (1886). It appears, however, that in 1852 Mueller had already described the same species under the name of E. cladocalyx, but discards this for E. corynocalyx in his "Eucalyptographia," 1879, and Bentham follows his wishes. He must evidently have had some sound reason for such alteration of nomenclature, and now that the name of E. corynocalyx runs through Eucalyptus literature of the last fifty years, we have decided to fall into line with the author's wishes and use the name E. corynocalvx. and not that of E. cladocalyx.

ESSENTIAL OIL. - Material consisting of leaves and terminal branchlets for distillation was collected at the Kingscote end of Kangaroo Island, in June, 1911. The yield of oil was very small, only 3 oz. being obtained from 194 lb. of material, equal to 0.096 per cent. The crude oil was of an orange-brown colour, and the odour resembled that of an oil belonging to the cineol-pinene group. The secondary odour was indefinite. Phellandrene does not occur in the oil of this species. The crude oil had specific gravity at 15o C. = 0.8945; rotation aD + 8.1°; refractive index at 20° = 1.4779, and was soluble in 4 volumes 80 per cent, alcohol. The saponification number for the esters and free acid was 7.7.

On rectification, a few drops of acid water, with some aldehydes, came over below 159o C. (corr.). Between 159-167°, 28 per cent. distilled, and between

167-205°, 53 per cent. came over ; the residue thus represented 19 per cent. As the amount of oil was small, less than half the usual quantity was available for distillation. These fractions gave the following results :-

The cineol was determined by the resoreinol method in the rectified portion ; when calculated for the crude oil the result was 20 percent. The oil of this species has a strong resemblance to those distilled from E. microcorys and E. metadata. The chief terpene was dextro-rotatory pinene. The species has little value as an oil-producing Eucalypt.

The results obtained with the oil of this species were published by us in the Trans. Roy. Soc, South Australia, 1916.