CYCLOPS. 
208 
pletely oval in form, and more rounded than in preceding 
varieties. The caudal segments and filaments are rather 
shorter and thicker, and the antennae longer. It varies in 
colour according to locality, &c. Sometimes it is of a red 
colour, sometimes of a dull white; and at others of a green, 
more or less deep. The external ovaries are carried 
diverging out from the abdomen more or less at a right 
angle with it (t. XXIV, f. 4.) 
Cyclops quadricornis, vars. rubens, albidus, and yibidis, Jurine, 
Hist. Monoc, 1. 1, f. 1-11 ; t. 2, f. 1-9 ; t. 2, f. 10, 11; 
t.3,f. 1-3. 
Cyclops pictus, Koch , 1. c., h. xxi, t.l. 
Cyclops pulchellus, Koch, 1. c., h. xxi, t. 2. 
Cyclops vulgaris, Koch, 1. c., h. xxi, t. 4. 
Cyclops obsoletus, Koch, 1. c., k. xxi, t. 5. 
Cyclops bistriatus, Koch, 1. c., k. xxi, t. 7. 
Cyclops lucidulus, Koch, 1. c., h. xxi, 1. 10. 
Var. c . — The figures given by Jurine of his varieties 
fuscus and prasinus agree with this variety. It differs 
from the last, chiefly in its carrying the external ovaries 
close upon and covering part of the abdomen. They do 
not appear ever to divaricate, either when the animal is at 
rest, or swimming. The inner edge of the caudal seg- 
ments are beset with short, stout setae ; the antennae are 
somewhat longer, and the last two joints of the antennules 
are considerably longer than in either of the two preceding 
varieties (t. XXIV, f. 5.) 
Cyclops quadricornis, vars. euscus and prasinus, Jurine, Hist. 
Monoc., t. iii, f. 5. 
Cyclops phaleratus, Koch, Deutsch. Crust., k. xxi, t. 9. 
Hab . — In ponds and ditches; common everywhere, 
almost all the year round. 
