184 
BRITISH ENTOMOSTRACA. 
In Number 288 of the 4 Philosophical Transactions’ for 
January and February, 1703, the same author gives a 
description of a polype (the Hydra viridis of Muller) 
growing upon the lemna, or duck-weed, which calls forth 
another paper from an anonymous correspondent, in 
Number 288, for November and December, 1703, in 
which the writer mentions his having frequently observed 
the same polype growing upon insects, especially upon 
“ two sorts, of the crastaceous kind/’ Of these two 
species of animals, which he states are monoculous he gives 
figures, sufficiently correct to show them to be the Cyclops 
quadricomis and Biaptomus Castor , the first being a tole- 
rable figure, though the second is very indifferent. The 
same writer also takes notice of a third animal of the 
same family, which is much smaller, and like a shrimp, 
but which he could never figure, evidently the Cantho - 
camptus minutus . 
Baker, in his ‘Microscope made Easy/ 1743, makes 
a few remarks upon the same animals, and copies the 
figures from the ‘ Philosophical Transactions / and in his 
‘Employment for the Microscope/ 1764, he publishes a 
letter from a correspondent, who gives a variety of details 
with regard to the animal which Leeuwenhoek describes, 
finds great fault with his figure, but gives a much worse 
one himself ! 
De Geer, in his ‘ Memories pour servir a l’Histoire des 
Insectes/ vol. vii, published in 1778, is the next author, 
I believe, who has entered into any details relative to this 
family. He describes at considerable length, and figures 
with tolerable accuracy, the Cyclops quadricomis , and 
confirms many of Leeuwenhoek’s statements respecting it, 
particularly the great difference between the young and 
the old animal. 
Otho Eridericus Muller * is the next succeeding author 
who has particularly noticed the family. Previous to his 
* Zoolog. Dan. Prodrom., 1776; Entomostraca, seu Insecta Testacea, 
&c., 1785. 
