THE ENTOMOLOGIST. 
No. 93.] AUGUST, MDCCCLXXI. [Price 6d. 
Answers to Correspondents. 
ARGULUS FOLIACEUS (MAGNIFIED). 
Argulus foliaceus.—The animal J. R. has sent and described 
is Argulus foliaceus: it is an apterous aquatic insect of the 
division Entomostraca, which is composed of exosteate 
animals, which have eyes imbedded in the carapace, and not 
placed on a peduncle, as in crabs and lobsters, The Argulus 
attaches itself to fishes by means of two sucking-disks, which 
adhere so tightly to the fish that it is often difficult to remove 
them alive. When firmly attached the Argulus sucks the 
blood of the fish by means of a sharp-pointed rostrum or 
proboscis: this has been called a siphon, and the animals 
which possess it Siphonoptera, both rather fanciful appella- 
tions. ‘The female carries a large bag of eggs, apparently in 
the thorax, and the carapace, or cephalothorax, is so 
transparent, that this ovary and its contents can be seen 
through it. I have never met with a male. The figure, 
which I have traced from Baird’s ‘Cyclopedia of Natural 
Sciences,’ represents a female, with the ovary full of eggs: 
these eggs are deposited on the leaves of water-plants, 
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