40 
BRITISH ENTOMOSTRACA. 
I suspect it to be their only one, and that they are merely 
aquatic, and never turn to flies, as many insects found in 
water do.” (p. 72.) 
Linnseus had, long previously to this, in his c Fauna 
Suecica,’ 1746, noticed an animal which may, perhaps, 
be the same as this. He inserts it at the end of the 
volume, as if in doubt where to place it, and indeed de- 
scribes it as a larva. He asks, “An larva Ephemerae?” 
but at the same time particularly mentions the female as 
possessing a small, yellow, shining globule, adhering to the 
abdomen, and which, he says, is perhaps the ovary, ready, 
as soon as the metamorphose is completed, to become 
eggs. 
A few years after this, Schceffer, while studying the En- 
tomostraca, discovered, in a pool of water near Ratisbon, 
a number of specimens of an “ aquatic insect,” very similar 
to the species found in England. He published a long 
description of it in 1752, under the name of Apus pisci- 
formis, which he afterwards, in his 4 Element. Entomol.,’ 
changed to JBranchipus pisciformis. Schoeffer appears to 
have dissected it very carefully, and gives figures of various 
parts, as observed by the microscope ; but neither in his 
description nor his figures does he take the slightest notice 
of the peculiar complicated apparatus attached to the head, 
which characterises so strongly the genus Chirocephalus, 
and which, though roughly executed, is decidedly ex- 
hibited in the figures given by King. Linnaeus, in the 
meantime, having ascertained that his opinion, as to the 
insect which he mentioned in the ‘ Eauna Suecica’ being 
a larva, was erroneous, described it, in the tenth edition 
of the ‘ Systema Naturae/ as a Crustacean, under the name 
of Cancer stagnalis. His description is so short that it 
is impossible now to ascertain whether the animal he men- 
tions possessed this peculiar apparatus or not ; but Dr. 
Shaw found it again in England, and published a length- 
ened notice of it in the first volume of the ‘Linnean 
Transactions’ for 1791. He does not state the locality 
where it was found, but he describes and figures with 
