ON PARASITIC EUCOPEPODA FROM TANGANYIKA. 819 
45. Zoological Results of the Third Tanganyika Expedition, 
conducted by Dr. W. A. Cunnington, 1904-1905.— 
Report on the Parasitic Hucopepoda. By Winiiam A. 
Cunnineton, M.A., Ph.D., F.Z.S. 
[Received May 4, 1914: Read June 9, 1914. | 
(Plate I.* & Text-figure 1.) 
INDEX. 
Systematic : Page 
Lerneocera: List of described Species with synonyms ...... 820 
Derneocera: Key to Species of ............ cc ccceeeceeeeeeeeeeeeee 824 
DLerneocera diceracephala, Sp. Ve... 2.0... .cc eevee eee eee eee, 824 
IES GH NIOCG HLH Gy Oo Ty ooo occacacn Sooscneeocayseadoncdoanadeeascengens  eY40) 
JE UAT HOH Ds SDo Me cooatioanse6soracnoncsere nan qonccdnesacsesoscasen | tsYAU/ 
1. Introduction. 
In addition to the parasitic Copepods belonging to the order 
Branchiura, the collections made during the Third Tanganyika 
Expedition contain a very few specimens of parasitic Hucopepoda 
belonging to the family Lerneide ?. While there are many 
parasitic forms of Eucopepoda, comparatively few of them have 
been found on freshwater hosts, and these, perhaps, have 
received less attention than the forms infesting marine fishes. 
In the family Lerneide, the genus Lernewocerat is the only 
one which is known to occur in fresh water, and it is to this 
well-known genus that our specimens have been referred. 
Through the kindness of Dr. Calman I have been allowed 
to examine a good many examples of Lerneocera from the Nile, 
which belong to the British Museum §, Since these specimens 
have not been examined or described, and since they add con- 
siderably to the scanty material which we possess from the 
African continent, an account of them is included in the present 
paper. So far as I am aware, the existence of the genus in 
Africa has never been put on record before, the species hitherto 
known being either European or American. The following is 
* For explanation of the Plate, see p. 829. 
+ Certain parasitic Eucopepoda belonging to the family Ergasilide were obtained 
by the Expedition, in addition to the forms described in this paper. They were 
taken in the last free stage, in tow-nettings associated with non-parasitic Copepods, 
and in consequence were dealt with by Prof. G. O. Sars in his paper on the Copepoda 
of the Third Tanganyika Expedition (Proc. Zool. Soc. 1909, p. 63). 
t+ The generic name is written throughout in the form in which it is almost 
universally quoted, and no¢ as it was originally spelled by Blainville, viz. Lerneocera. 
The word is derived from the Linnzan genus Lernea. 
§ By the courtesy of the authorities of the Berlin Museum, specimens of 
L. cyprinacea and LL. esocina (the latter, one of the original examples studied by 
von Nordmann) were lent to the British Museum for the purpose of comparison 
with the forms described here. I am particularly indebted to Dr. EK. Vanhoften for 
the trouble he has taken in the matter. 
