CYTHERE. 
163 
Gems 1 — Cythere. 
Cythere, Muller, Latreille , Desmarest, M. Edwards , fyc. Sfc. 
Cytherina, Lamarck , Sowerby, Munster, Boemer, 8fc. Sfc. 
Cypridina, Bosquet (not M. Edwards). 
Bairdia, M l Coy, Jones.* 
Character . — One eye. Three pairs of feet ; all ex- 
ternal, none being inclosed within the shell. Abdomen 
short. Inferior or pediform antennse furnished with one 
tolerably long, curved and jointed filament. Superior 
antennae simple, setiferous, and not provided with any 
pencil of long filaments. 
Bibliographical History . — Before Midler’s time the 
animals of this genus were perfectly unknown, not the 
slightest mention of their existence having been made by 
any previous writer. As he is the first who has noticed 
them, so he is the only author to whom we can refer for 
any information respecting them, with the exception of 
what I have added in my paper in the ‘ Mag. of Zool. 
and Botany’ for August 1837. Upon a slight inspection 
the Cytheres might be mistaken for Cyprides ; but their 
superior antennae, being simple and free from the pencil 
of long hairs with which these organs in the Cypris are 
endowed, their possessing three pairs of feet, all of which 
project out of the shell, and the want of the long tail or 
abdomen, sufficiently distinguish the two genera. It is in 
his ‘ Entomostraca’ that Muller first established the genus, 
and the above marks of distinction between it and the 
Cypris constitute almost all the knowledge that he imparts 
to us concerning it. Meagre as it is in its details, it has 
not been enlarged by any succeeding author. 
Gmelin, in the ‘ Syst. Nat.,’ 1788, Eabricius, in his 
‘Ent. Syst.,’ 1793, Manuel, in the ‘Encyc. meth.,’ 1792, 
Latreille, in his ‘Hist. Nat. Crust, et Ins.,’ 1802, either 
* The animal, in those recent species which have been referred by Mr. Jones 
to the sub-genus Bairdia, M‘Coy, and which I have had an opportunity of 
examining, does not differ in the least from the animal of the Cythere proper. 
