1290 



CRUSTACEA. 



light, is peculiar. It is more opaque than the following species. The 

 height is about two-thirds the length. 



Cypris albida, Dana, Proc. Amer. Acad. Sci., ii. 49. 



Family HALOCYPRIDJS. 

 Subfamily CYPRIDININ^E. 

 Genus CYPRIDINA, Edwards. 



This genus diners from Cypris in the beaked front, and in the fact 

 that the feet corresponding to the first pair in Cypris is here foliaceous, 

 or properly a pair of maxillae. The ovarian feet are longer and much 

 more flexible, bending like a worm ; and they are furnished with setae. 

 about the extremity, the terminal of which are reversed. Besides, the 

 mandibular feet are elongate and fitted for prehension at the extre- 

 mity ; the posterior antennae end in a pencil of plumose setae from 

 several short joints, and are subnatatory, while the anterior antennae 

 are furnished at apex with a few unequal straight setae, that may be 

 diverged or brought together. 



The mandible is a small process on the basal joint of the mandi- 

 bular feet, and it appeared to have but little strength or firmness. 

 Other characters of the genus will be gathered from the descriptions 

 and figures of the following species. 



This genus was established under the name Cypridina by Milne 

 Edwards, and imperfectly described by him in a note to l'Hist. des 

 Anim. sans Vertebres de Lamarck, 2d edit., t. 5, p. 178, and Hist, 

 des Crustac&s, par M. Milne Edwards, iii. 409. It appears to include 

 the Asterojpe of Philippi (Archiv fur Naturgeschichte, vol. vi. 1840, 

 p. 186, taf. iii.), which is described as differing only in the caudal 

 extremity. Since all our species agree with Philippi's specimens, we 

 infer that there must be an error in Edwards's description. Some new 

 species have recently been added to the genus by Mr. W. Baird, m 



