1909.] CoPEPODA OF THE THIRD TANGANYIKA EXPEDITION. 3k 
Figs. 94-104. Trypanosoma perce, from the Perch, all from preparations stained 
with iron-hematoxylin, except 94, 95, 103, 104. 97, 98, fixed with 
Schaudinn’s fluid after previous exposure to osmic vapour ; 98-102, 
fixed with Mann’s picro-corrosive-formol ; 103, osmic vapour followed. 
by absolute alcohol, 104, dried off and fixed with absolute alcohol, 
both stained with Giemsa’s stain. 
94, 95. Sketch of Trypanosoma perce, large forms, drawn living ; 
94, a Specimen showing two dots at the hinder end (kinetonucleus 
and blepharoplast ?); 95, a specimen showing a refringent dot, 
lodged in a vacuole, close behind the trophonucleus. 
96. Specimen showing myonemes on both surfaces of the body, from a 
preparation in which the stain was but slightly extracted. 
97. Middle portion of another specimen, very contracted, showing 
myonemes, from the same preparation as the last. 
98. Specimen showing a large blepharoplast, connected with the kineto- 
nucleus (or division of the kinetenucleus 2). 
99. Another specimen from the same preparation as the last. 
100-102. Trophonuclei of different specimens. 
103, 104. Stout forms drawn to show the distribution of the cytoplasmic 
eranules ; in 104 many of the granules are in pairs, as if dividing or 
recently divided. 
2. Zoological Results of the Third Tanganyika Expedition, 
conducted by Dr. W. A. Cunnington, F.Z.S., 1904—- 
1905.—Report on the Copepoda. By Prof. G. O. Sars, 
C.M.Z.S. 
| Received September 11, 1908. | 
(Plates VI.-X XITT.*) 
INTRODUCTION. 
The Entomostracan fauna of the great inland waters of 
Central Africa is still very imperfectly known. Only one of the 
big lakes, viz., Victoria Nyanza, has been partly explored in this 
respect by German naturalists, the results bemg published in 
the great work ‘ Die Thierwelt Deutsch Ost-Atrikas,’ whereas the 
other large lakes have remained almost entirely unexplored, so 
far as regards the Hntomostraca. During the third Tanganyika 
Expedition the conductor, Dr. W. A. Cunnington, made collec- 
tions not only in Victoria Nyanza, but also in two other lakes, 
viz., Nyasa and Tanganyika. The higher Crustacea contained 
in these collections have already been worked out and the results 
published in the present journal, for the Brachyura by Dr. Cun- 
nington, for the Macrura by Dr. Calman. It has hereby been 
proved that Lake Tanganyika differs remarkably in its faunistic 
character from the other two lakes, and on the whole exhibits 
a much richer and more specialized fauna, as regards these two 
groups. Of course, it would be of great interest to know if an 
analogous difference also exists as regards the lower Crustacea or 
Entomostraca. Material for the solution of this question has 
fortunately been procured by Dr. Cunnington, who by the aid 
of more or less fine-meshed tow-nets has collected from each 
of the three lakes a number of samples chiefly taken at the 
* For explanation of the Plates see p. 72. 
