2 39 
ON SOME SPECIES OF CYCLOPS AND 
OTHER ENTOMOSTRACA COLLECTED 
BY DR. }. M. DALZIEL IN NORTHERN 
NIGERIA 
BY 
G. STEWARDSON BRADY, M.D., LL.D., D.Sc., F.R.S. 
( Received for publication 21 Juno, 1910) 
PLATES XVIII-XX 
The species here described were collected by Dr. Dalziel at \ r ola 
in Northern Nigeria, in the course of a research on the Life History 
of the Guinea Worm. The specimens were sent to me for descrip¬ 
tion by Mr. J. H. Ashworth, of the Zoological Department of 
Edinburgh University, and examples, as far as possible, of the various 
species have been sent to the University for future reference. Some 
few types are, however, unavoidably absent. Dr. Dalziel made 
careful notes of the various localities from which his specimens were 
taken, which I here transcribe. The sources of each particular 
species are indicated by the letters affixed to the descriptions. 
Sources. 
A. Turbid bush-pools with muddy bottom, frequented by cattle 
and containing fish. 
B. Surface-well in clay, free from water plants, but with grass 
and weeds dipping down the sides to the water’s edge. 
C. Marshes or pools of clear water when undisturbed ; bottom of 
m ud or of grass coated with sediment; containing Lenina , 
A' ymphoea and other water plants, and fringed with rank grass. 
D. Small pools of clear water in shrinking bed of River Benue, 
recently isolated and therefore not long stagnant, and containing 
flocculent viscid algae, insect larvae, etc. 
£• Benue River, small bays and backwaters of clear water but 
no curre nt, sandy edges and bottom with some vegetable debris and 
sediment, but no growing vegetation. 
