194 
BRITISH ENTOMOSTRACA. 
place (t. XXIY, f. 10) ; the body was divided into two seg- 
ments, abdomen into three, the terminating one cleft at 
extremity, each cleft sending off a long seta ; antennae of 
about six articulations ; the antennules had become dis- 
tinctly visible, and the feet had assumed the appearance 
they afterwards bear. At each moulting the number of 
segments into which the body and abdomen are divided 
increase in number. The number of articulations and 
the length of antennae increase, &c. ; but it is not until 
after the third moulting that the animal is perfect 
(t. XXIV, f. 3), and capable of producing its species. 
A question has been started, whether the Cyclopidae 
should be considered oviparous or viviparous ; and it ap- 
pears to be one of some difficulty, as they would seem, 
from what I have stated, to be both. Geoffroy asserts 
that all the Monoculi are oviparous.* He Geer also says 
they are oviparous. “ However/' he immediately adds, 
“ as the Monoculi never quit their eggs before the young 
ones are hatched, we may perhaps regard them as vivi- 
parous, "f J urine says it is difficult to decide. Vivi- 
parous young, he remarks, increase in size every day, and 
have constant need of a mother's care — if she die, all die ; 
but as the young of the Cyclopidae do not increase in size 
after passing from the internal ovary, and as, from nu- 
merous experiments which he details, they were found, 
after having passed into the external ovary, to be inde- 
pendent of the life of the mother, even if she were killed 
by spirits of wine, they must, he concludes, be considered 
oviparous 4 
The process of moulting, under which the little creature 
frequently succumbs, is both interesting and curious. 
The new shell or covering having grown under the old 
one, when the process of changing it commences, the in- 
sect fastens itself to the bottom or side of the vessel in 
which it is, or to any solid object near it, so as to give 
* Hist, abreg. des Insectes, 654. 
f Mem. pour serv. a THist. des Ins., vii, 435. 
t Hist. Nat. des Monoc., 17. 
