DESCRIPTION OF SPECIES : CYPRIS. 



123 



§ IX. DESCRIPTION OF SPECIES. 



Family 1.— CYPRIDtE. 



Genus 1. — Cypris, Miiller. 



Valves mostly subreniform or elongate-oval, horny in texture. Upper antennae seven- 

 jointed, and beset with numerous long plumose setae, which are mostly distributed as 

 follows, — four from the apices of the fourth, fifth, and sixth joints, and three from the 

 apex of the terminal or seventh joint. Lower antennae five-jointed, bearing a fascicle of 

 five or six setae of variable length, and on the inner side of the third joint a short bi- 

 articulate seta ; terminating in four long curved and serrated claws ; a few short setae 

 also arise from the sides of the fourth joint, near the middle ; second pair of jaws smaller 

 than the first, in the male prehensile, and in the female consisting of a short, simple, 

 setiferous lobe, a subcorneal, simple, or obscurely articulate palp, which projects back- 

 ward, and terminates in three long setae, and a small branchial plate, bearing six 

 radiating respiratory setae. Postabdominal rami long and slender, bearing at the apex 

 two long and unequal curved claws, and a short seta ; a short seta springs also from the 

 inner margin of the ramus at or below the middle. The males furnished (mostly, if not 

 always) with two mucous glands, consisting of a cylindrical axis, on which are set seven 

 whorls of radiating filaments, the whole connected with an efferent tube or " vas 

 deferens." 



1. Cypris compressa, Baird. Plate I, figs. 5, 6. 



1835. Cypkis compressa, Baird. Trans. Berw. Nat. Club, vol. i, p. 100, t. iii, fig. 



16; (1850) Brit. Entom., p. 154, t. xk, figs. 

 14, 14 a—c. 



1853. — — Lilljehorg. De Crust, ex. ord. trib., p. 112, t. x, 



figs. 16—18. 



1868. — — Brady. Monog. Recent Brit. Ostrac, p. 372, pi. xxiv, 



figs. 1 — 5, and pi. xxxvi, fig. 6. 



1854. — (cypeia) PUNCTATA, ZeH^er. Anatomisch-system. Stud, liber die Krebs- 



thiere, p. 77, taf. 3 a. 



Shell much compressed, seen from the side broadly reniform, greatest height situated 

 in the middle, and equal to more than two thirds of the length ; extremities broadly 



