660 General Notes. [ October, 
plete ; thorax distinct, incomplete ; pygidium distinct, incomplete. 
4th. Head and thorax complete ; pygidium distinct, incomplete. 
With regard to 7riarthrus our author says: “ We find Triar- 
thrus becki placed doubtfully at the end of the third order on the 
description given by Prof. Hall. We cannot remove it from that 
position, as the youngest stage we have shows one segment in the 
thorax, but from the changes that occur in its development we 
cannot avoid the conclusion that with more complete material it 
will be removed to the second order, as the smallest individual is 
one millimetre in length, and the head and pygidium are strongly 
lobed and well developed.” Two beautiful plates illustrate the 
new species and the various stages of the trilobite—F. S. K. 
GEOGRAPHY AND TRAVELS.' 
AFRICAN ExpLoratTion.—The Portuguese are about sending out 
another expedition, under Capt. Paiva d’Andrada. This party 
is to continue the exploration of the Zambesi river, and to form 
commercial and agricultural colonies in the neighborhood of Tete 
and the abandoned station of Zumba, which was once the fur- 
thest point occupied by the Portuguese on the river. 
The party sent out from Livingstonia in August, 1878, to 
explore the western shore of lake Nyassa, after reaching Kuta 
ay, as mentioned in the NATURALIST for June, 1879, returned 
home, part of the way by another route, reaching Livingstonia 
on November oth. Another attempt is soon to be made by the 
missionaries to obtain a better site for their station than the pres- 
ent one. They hope to find it between the Nyassa and the Tan- 
ganyika. 
The East African Expedition of the R. G. S., under Mr. Keith 
Johnston, left the coast for the interior on the 19th of May. The 
natives in his employ numbered 138. He communicated to the 
society the route which he intended to take,? and upon which he 
was to proceed south-westwardly from Dar-es-Salaam, and would 
be likely to obtain abundant supplies of food. He had previously 
made a short trip to Usambara. “This journey,” he remarks, “fur- 
nishes an excellent specimen of the sort of traveling we shall have, 
and took us through a country which may be taken as an epitome 
of all Africa. There was a little bit of arid, level, uninhabited 
desert, a bit of undulating, cultivated and populous country, and 
beyond that a tract of mountain forest and stiff climbing. The 
magnitude of the trees and the density of the forest exceeded 
anything I had imagined in Africa, and reminded me of Northern 
Paraguay, only here there is much less variety in the tree forms. 
But this expedition, starting under such favorable auspices, has 
already been deprived of its young and most capable leader. 
1 Edited by ELtts H. YARNALL, Philadelphia. 
Bs. l'roceedings of Royal Geographical Society, July, 1879. 
