I have failed to find them there. The country is covered with jj- 
holes of varying depth, and along the railway by borrow-pits. 11 
water in the shallower pits drys up, and by the end of the dry sc; 
the bottoms of the pits have been baked dust dry. After a week 
heavy rain these pits begin to retain a permanent pool of wate: 
Upon this pool frog spawn soon appears, and shortly afterward- 
adult females of No. 6 (Cyclops leuckarti , Claus) can be found. B\ 
the middle of May the intermediate nauplius forms have appeared 
Then the females become gradually less numerous and males incrc i - 
in number, until by the middle of J uly the females have become ran- 
than the males. 
Meanwhile, Cyclops Nos. 2, 3, 4 and 5 appear in the pools in 
relatively small numbers, and are soon accompanied by their naup!in¬ 
forms. 
Lastly, Cyclops No. 7 (C. simillimus, sp. nov., Graham) app< 
in the pools (the females first, the males later), and seems to take th> 
place vacated by C. leuckarti. 
This account brings up the history to the end of July; and 1 w. - 
transferred early in August to another station. 
The inference previously alluded to, that all species of Copepoda 
cannot act as efficient hosts to Guinea worm, is strengthened by th< 
following considerations: — 
ist.- 
-1 here is a large number of species. 
_nd. The habits of the different species vary greatly. Some a 
surface feeders, some are found at the bottom. Son 
n abit foul, some clean water. Some leave the water i 
c imb on stalks of water-weed enveloped in a drop of waU 
carried with them, some do not leave the water. Some a: 
ound in streams, some are not 
3rA ”hJ he t dlffe J re ” t s P edes are infested by d.fferent parasites 
ounc os. 3, 4 and 5 infested only by ecto-parasite 
(algae) and No. 6 infested by ento-paras.tes (worms). 
4 b.- r h e d.fferent species d.ffer in the date of then appears 
or at? 0 : 15 ' , “ e are fOUnd earl >’ ■" May; some a PP «, 
of' th' CaS ’ ° n y became num erous, in July. The importaK. 
It* r ,atl ° n m date has b «n already explamed b, 
me m a former article (B.M.J., 1I/II 05) . 
