APODIDJE. 
19 
to move its feet with constant and singular facility, with- 
drawing the extreme part of the body, as it were into a 
sheath, and again protruding it. I could find amongst 
authors no trace of any insect of this sort/ 5 (p. 152.) 
About the same time a number of specimens of the same 
animal were found in Kent by theRev. Mr. Littleton Brown, 
F.R.S., who, in August 1 7 36, sent a specimen, with a letter 
to Dr. Mortimer, then secretary to the Royal Society, and 
which is published, along with Klein’s letter to Sir Hans 
Sloane, in the ‘Philosophical Transactions 5 for 1738, 
No. 447. “ I brought it, 55 he says, “ from a pond upon 
Bexby (Bexley?) Common, where great numbers have 
been observed for these five weeks past. The pond was 
quite dry, the 24th of June, but upon its being filled with 
the great thunder-shower, upon the 25tli, within two days 
the pond was observed to swarm with them, by a farmer 
watering his cows there. 55 (p. 153.) 
Linnaeus, in his ‘Fauna Suecica, 5 published in 1746, 
mentions that he had seen a specimen dried of this animal, 
in London, as early as the year 1728, at the house of a 
naturalist, who told him that it had been taken in Prussia. 
The chief early historiographer, however, of the genus 
is Schoefier, who in his monograph ‘Der Krebsartige 
Kiefenfuss, 5 published at Ratisbon in 1756, gives a very 
long and full account of almost all that was then known 
concerning it, with well-executed figures of two species, 
numerous anatomical details, and the progressive deve- 
lopment of the animal, from the egg to maturity. His 
description is very carefully drawn up, and Latreille, in 
his ‘ History of the Phyllopoda, 5 has translated the greater 
part of it into French, and thus rendered it more ac- 
cessible to naturalists in this country. 
Voschge, in a paper in the ‘ Naturforscher 5 for 1783, has 
given a good many details, and a short but excellent de- 
scription of the anatomy of the mouth is given by Savigny, 
in his ‘ Memoires sur les Animaux sans Vertebres, 5 1816. 
Bose, Latreille, Desmarest, and Milne Edwards have 
repeated Schoeffer’s descriptions and observations in their 
