CRUSTACEA. 633 
Se. nat. 2e Série, Tom. 1. Zoologie, pp. 333—338, Pl. 9, Putiiprr in Winc- 
MANN’S u. ERIcHSON’S Archiv, 1839, 1840, 1843, where some other genera 
are proposed which are here omitted. Comp. LuBBooxk de novis generibus 
et specieb. Calanidarum, Ann. of nat. Hist. sec. Series, Vol. x1. 1853, pp. 
25—29, pp. 202—209, XII. pp. 115—124. 
Family VIII. Ostracoda (Cypridina Epvw.). Body com- 
pressed, with segments indistinct, included in a bivalve shell, with 
dorsal hinge. Anterior antenne setaceous; posterior geniculate, 
pediform. ‘Two pairs of maxillz; the second pair or foot-jaws with 
a pectinate or flabelliform appendage at the base. Feet undivided, 
acuminate towards the extremity, slender, four or six. 
The two large jointed appendages, especially useful in swimming, 
which we have here regarded as posterior antenne, are by many 
writers, even by Ericuson, considered to be the first pair of feet, 
(placed in front of the mouth). On this supposition these little 
animals have not two or three, but three or four pairs of feet. 
A. Eye single. 
Cypris Muretu. (Species of Monoculus L.). Only two pairs of. 
feet besides the posterior pediform antenne; feet of the last pair 
recurved upwards, concealed beneath the shell. Abdomen termi- 
nated by a bifurcated tail. 
Comp. H. E. Straus Mémoire sur les Cypris, Mém. du Mus. d Hist. nat. 
vil. 1821, pp. 33—61, Pl. 1. and 8. FiscHer Abhandlung iiber das Genus 
Cypris. Mém. des savants étrangers der Kaiserl. Akad. der Wissensch. Tom. 
vit. St Petersburg, 1851. 
Sp. Cypris fusca Straus (Monoculus conchaceus L.?), STRAUS 1. 1.1. figs. r— 
16, GuéRiIn Iconogr., Crust. Pl. 32, fig. 4, Desmar. Crust. Pl. 55, fig. 1, 
&c. These animals live in fresh water. 
Cythere MUELL., Cytherina Lam. Three pairs of feet besides 
the posterior pediform antenne. . 
B. HKyes two. 
Cypridina Ew. [and Asterope Puiirrt). 
Orver LV. Cirripedia. 
Crustaceans affixed in the adult period, included in a multivalve 
shell or coriaceous covering furnished with calcareous points, as 
though rudiments of shell. Eyes in adults none. Six pairs of 
