CRUSTACEA. 633 



Sc. nat. 2e SeVie, Tom. i. Zoologie, pp. 333 338, PI. 9, PHILIPPI in WIEG- 

 MANN'S u. ERICHSON'S Archiv, 1839, l8 4 1843, where some other genera 

 are proposed which are here omitted. Comp. LUBBOCK de novis generibus 

 et specieb. Calanidarum, Ann. of nat. Hist. sec. Series, Vol. XI. 1853, pp. 

 25 29, pp. 202 209, xn. pp. 115 124. 



Family VIII. Ostracoda (Cypridina EDW.). Body com- 

 pressed, with segments indistinct, included in a bivalve shell, with 

 dorsal hinge. Anterior antennae setaceous; posterior geniculate, 

 pediform. Two pairs of maxillae ; 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 antennse, are by many 

 writers, even by ERICHSON, 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 MUELL. (Species of Monoculus L.). Only two pairs of 

 feet besides the posterior pediform antennae ; feet of the last pair 

 recurved upwards, concealed beneath the shell. Abdomen termi- 

 nated by a bifurcated tail. 



Comp. H. E. STKAUS Memoire sur les Cypiis, Mim. du Mm. d'ffist. nat. 

 vn. 1821, pp. 33 61, PI. i. and S. FISCHER Abhandlung ilber das Genus 

 Cypris. Mem. des savants Grangers der Kaiserl. Akad. der Wissensch. Tom. 

 VII. St Petersburg, 1851. 



Sp. Cypris fusca STRAUS (Monoculus concJiaceus~L.1], STRAUS 1. 1. 1. figs, i 

 16, GUERIN Iconogr., Crust. PI. 32, fig. 4, DESMAR. Crust. PI. 55, fig. i, 

 &c. These animals live in fresh water. 



CytJiere MUELL., Cytherina LAM. Three pairs of feet besides 

 the posterior pediform antennae. 



B, Eyes two. 



Cypridina EDW. [and Asterope PHILIPPI]. 



ORDER IV. 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 



