235 
or where two systems of folds interfere’) exceptions to the above 
mentioned rules and complicated cases may be expected. The deep 
sea chart of the Siboga shows good examples of this fact. 
Zoology. — “On the Freshwater Fishes of Timor and Babber.” By 
Max Weser and L. F. pe Bravrorr. 
The Timor Expedition, under leadership of Prof. G. A. F. Monen- 
GRAAFF, returned to Holland with extraordinarily rich mineralogical, 
palaeontological and geological collections and its leader has already 
communicated some important preliminary results, which are of great 
importance, not only to our knowledge of Timor, but also to the 
geological history of the whole indo australian archipelago. As they 
throw new light on the youngest phases in the development of the 
archipelago, they are of special importance to the zoogeographer too. 
Therefore it is a memorable fact, that Prof. MOLENGRAAFF consented 
to our request to make a collection of freshwater fishes, when 
time and circumstances permitted, as thus important light is thrown 
on at any rate the younger phases of the evolution of the indo- 
australian archipelago. 
We are glad to seize this opportunity to thank him as well as 
his collaborator Mr. F. A. H. WeCKHERLIN DE Marez Ovens for the 
collection of well preserved specimens of fish, brought together by 
the lastnamed in different rivers of Timor and the island of Babber. 
As far as we know, Babber was — ichthyologically — a terra 
incognita. The following fishes were collected by Mr. WECKHERLIN 
pe Marrz Ovens in the rivers (Jer), which are mentioned next to 
the name of the fishes. 
Anguilla mauritiana Bunn. Jer Lawi, 7 Km. above mouth. Jer 
Toilila near Tepa, 500 M. above mouth. 
Carans carangus Bu. Jer Lawi, 7 Km. above mouth. 
Gymnapistus niger C. V. Jer Lawi, 7 Km. above mouth. 
Eleotris gyrinoides Buxr. Jer Toilila near Tepa, 500 M. above 
mouth. Jer Lawi, 7 Km. above mouth. 
1) The Kast-Indian archipelago is situated in the area of junction of two systems 
of folding of the earth’s crust, the alpine and circumpacific system, vide E. Have. 
Les géosynclinaux et les aires continentales. Bull. de la Soc. Géol. de France. 
1900. 3. Sér. Vol. 28 p. 635. Whereas E. Haua refers in this area to an “embran- 
chement” of the two systems, SARASIN goes further and speaks of an actual conflict : 
“Ich habe noch immer den Eindruck, dasz es sich im malayischen Archipel um 
einen Konflikt zwischen den Kettensystemen der Tethys und denen der pazifischen 
Umrahmung handle’. P. Sarasin. Zur Tektonik von Celebes. Monatsberichte der 
deutschen Geol. Ges. 1912. p. 215. 
16 
Proceedings Royal Acad. Amsterdam, Vol. XV. 
