A careful examination of the water sources of each station, and a 
classification of the Copepoda found in each place, is urgently 
required When it has been made, a comparison of the species of 
Cyclops found at a station where Guinea worm is common with the 
species of Cyclops found at a station where Guinea worm disease is 
absent would, I have no doubt, offer an explanation of the observed 
local variation in the incidence of the disease. 1 he practical value of 
an explanation is evident. It would enable the Medical Officer to 
identify those water sources likely to aid in the propagation of the 
malady. 
Cyclops No. i. ? Cyclops bicolor, G. O. Sars. 
Male.— C olour yellowish, with darker coloured first antennae. 
First antennae, 11 segments as long as f cephalothorax. lotal 
length, 0-46 mm. Cephalothorax and thorax, 0-30 mm. Furca, 
0 03 mm. 
Female.—C olour as in male. First antennae as in male, but 
more slender; total length, 0-62 mm. Cephalothorax and thoiax, 
0-42 mm. Furca, 0'04 mm. Egg sacs, a pinkish colour, carried apait. 
In both series the outward tail sita is long. F ound in pool with 
Calanus No. 1 ; water clear, and used by village as supply. 
Cyclops No. 2. Cyclops varicoid.es , sp. nov. (Brady) 
Male.—C olour, transparent pale yellow. First antennae, 12 
segments, nearly as long as cephalothorax. lotal length, o 59 mm - 
Cephalothorax and thorax, 038 mm. F urea, o'04 mm. 
Female.—C olour as in male. First antennae as above, but more 
slender. Total length, 0-64 mm. Cephalothorax and thorax, 
0-39 mm. Furca, 0'04 mm. Egg sacs, a yellow colour, carried close 
together. 
I-'ound in river water. 
Cyclops No. 3. Cyclops longislylis , sp. nov. (Brady) 
Male.—C olour, a pale yellowish-green. First antennae, 12 
segments as long as cephalothorax and two thoracic segments. 
Total length, 070 mm. Cephalothorax and thorax, o - 4 5 mm. 
furca, 000 mm. 
