255 
plant from Queensland, in the tropical parts of which State it 
would appear to be frequent, since six gatherings were forwarded 
from Dunk Island. Madame Weber kindly confirmed the deter- 
mination. 
The general morphology and structure of the present plant is 
very different from that of Ceratodictyon described above. The 
thallus consists of large, flattened, foliaceous segments of parenchy- 
matous structure. Both surfaces are completely clothed with a 
thin sponge, into which penetrate curious moniliform filaments 
given off from the outer layer of algal frond. The external 
appearance of the dual organism is that of old faded fronds, with 
varying outline, but on handling, the surface is found to be distinctly 
rough, and a section shows the sponge with numerous clusters of 
projecting spicules. The connection between the moniliform fila- 
ents and the sponge is doubtless close, but on the whole the 
commensalism is hardly so intimate as in Ceratodictyon. For 
further details see Weber, Ann. Jard, Bot, Buitenzorg sér. 2, 
Suppl. iii., pp. 587-594, 
XLITI.—_THE WALLICHIAN HERBARIUM. 
When Dr. Nathaniel Wallich, Superintendent of the Hon. E. I. 
Company’s Botanical Garden at Calcutta from 1817" to 1845, 
visited England on leave in 1828 he had entrusted to him the task 
of arranging for the distribution of the dried specimens of plants in 
the East India Company’s Museum, collected under his own super- 
intendence. In connection with this undertaking Wallich began to 
draw up a list of the species represented in the collection and dis- 
tributed, or to be distributed, by him to various botanical institu- 
tions. The title of this list, which constitutes the well-known 
Wallichian Catalogue, cited as ‘ Wall. Cat.’ or ‘ Wall. Cat. 
Lith.,’ is as follows :— 
“ A numerical list of dried specimens of plants in the East India 
“Company’s Museum, collected under the superintendence of 
“ Dr. Wallich of the Company’s Botanic Garden at Calcutta.” _ 
The purpose of the compilation cannot be better stated than it 
has been by Wallich himself on the opening page :— 
“The principal object of the following list is to supercede the 
“necessity of writing the numerous copies of labels, which will be 
“yequired on the occasion of the distribution of the duplicates in 
“the Company’s collection. For this purpose each specimen will 
“have a current number attached to it, besides separate ones in all 
“cases when two or more different habitats are assigned to the 
“plants ; so that, by comparing the number of the spevimens with 
“ those in the list, they will be readily identified, their exact locality 
til th 
Directors to this effect on Ist August, 1817. (Ann. Roy. Bot. Garden, 
Calcutta, vol. x., p. xxiii, footnote.) : 
