24 
BRITISH ENTOMOSTRACA. 
except that the fingers or claws successively become shorter 
and broader, while the branchial plates and oval sacs in- 
crease in size in the same proportion. These nine pairs 
of feet are described by Schoeffer under the name of claw- 
bearing branchial feet. The tenth pair of the branchial 
feet differ materially from all the rest (t. I, f ./), and as 
no males have as yet been met with; we can only describe 
them as they exist in the female. The basilar portion, 
consisting of three joints, is not distinctly seen, being 
merely a membranous expansion, although we trace the 
same number of claws and other bodies described in the 
preceding feet, but shorter and broader, whilst the tri- 
angular branchial plate and oval sac have assumed the 
appearance of two circular plates, one a little larger than 
the other, and attached to its fellow by a kind of hinge- 
joint, which allows them to be folded over upon each 
other, thus forming a kind of capsule. In place of being 
transparent and colourless, like the branchial plates in 
the other feet, these are full of little round spots, like 
grains, of a bright red colour, and which, when examined 
by the lens, are seen to be eggs. This pair of feet may 
therefore be considered as a sort of external ovary, — 
Schoeffer calls them ovarian feet. In the centre of the 
membranous basilar portion we observe a small, reddish 
spot, surrounded by an elevation in which there is an 
opening that will admit of a small bristle being intro- 
duced. Schoeffer considers this to be the situation of 
the organs of generation. The eleventh (t. I, f. g) and 
succeeding pairs of branchial feet, assume a different ap- 
pearance from that of the ten preceding. The basilar 
portion is much shorter, and apparently consists only of 
one joint. The external finger, or claw, is much larger, 
and semicircular, but of a membranous structure, and 
the others, though of the same number, are shorter and 
broader than the corresponding appendages of the other 
feet. The oval sac is rather narrower and more elongated, 
and the branchial plate is more rounded and broader, 
while on its external edge, instead of the numerous fine 
