190 
BRITISH ENTOMOSTRACA. 
eggs, which at the end of three months, at eight layings 
during that time, would give 320 young. Out of this 
number he calculates 80 as males (there being in every 
laying a great proportion of females), the remaining 240 
are females. 
The following table will show the prodigious extent of 
of their fecundity 
No. of 
layings. 
Time employed for 
these eight layings. 
TOTAL. 
Each laying sup- 
posed to he of 40 
young. 
Subtract for 
males. 
Eemales 
remaining. 
1st mother . 
»{ 
From 1st Jan. to 
end of March 
} 320 
80 
240 
1st family of fe- 
males 240 
Id 
From 1st April 
to end of June 
} 76,800 
19,200 
57,600 
2d family of fe- 
males 57,600 
W 
From 1st July to 
end of Septem. 
} 18,432,000 
. 4,608,000 
13,824,000 
3d fam. of fern. 
13,824,000 
Id 
From 1st October 
to end of Dec. 
} 4,423,680,000 
1,105,920,000 
3,317,760,000 
4,442,189,120 
1,110,547,280 
3,331,641,840 
A single copulation suffices to fecundate the female for 
life. The male seems very ardent in his amours. By 
way of prelude, he seizes hold of the hinder feet of the 
female with his antennae, which being furnished at its ex- 
tremity with the hinge-joint already described, forms a 
fastening round her feet, which she cannot loosen by 
any exertion, and thus he is carried about with great 
rapidity for some time. The female, however, at length 
stops, wearied by her exertions, when the male seizes the 
favorable moment, and in the twinkling of an eye (as 
Jurine expresses it) makes a double copulation, one on 
each side. According to Muller, the male organs are 
situate in the swellings which we perceive in the antennae 
of that sex, and which are characteristic of it. Carried 
away by the analogy of the Arachnidae, and seeing the 
male take hold of the lower part of the female with his 
* Jurine, Hist, des Monoc., &c., p. 32. 
