REPORT ON THE OSTRACODA. 31 



Section POD CO PA. 



Family I. Cyprid.e. 



Valves mostly thin and smooth, more or less sinuated below. Anterior antennae 

 mostly seven-jointed, and beset Avith numerous setse, which form a dense brush of 

 greater or less length ; posterior antennse geniculated, and bent backwards, four or five- 

 jointed, armed at the distal extremity with from three to five long, slightly curved claws, 

 and bearing commonly on the posterior aspect of the antepenultimate joint, a bundle of 

 setae. Mandibles powerful, and divided at the extremity into several teeth, bearing a 

 large four-jointed palp, the first joint of which is provided with a branchial appendage. 

 Two pairs of jaws : the first large, and divided into four digitiform segments, the 

 anterior segment being larger than the rest, two-jointed, and giving attachment to a 

 large branchial plate ; second pair small, simple, in the female bearing a simple sub- 

 conical palp, in the male often pediform. Two pairs of feet : the first stout, and five- 

 jointed, terminated by a long curved claw ; the second more slender, and usually bent 

 upwards within the valves. Postabdomen forming two long movable rami, which are 

 sometimes rudimentary and setiform, but oftener well developed, and terminating in two 

 strong curved claws. Eye single, or altogether wanting ; rarely double. Intestinal 

 canal forming two pouches ; ovaries and testis lying immediately beneath the shell. 

 Copulative organs of the male situated immediately in front of the postabdominal rami, 

 and provided with testes or mucous glands of complex structure. 



Paracypris, G. 0. Sars. 



Shell smooth, compact, elongated. Anterior antennse seven-joiiited, l^eset with rather 

 short setse ; posterior stout, terminating in four strong curved claws ; antepenultimate 

 joint bearing at its base a pedicellated hyaline vesicle. Mandibles terminating in five or 

 six long teeth, and l^earing a four-jointed palp, from the basal joint of which springs a 

 narrow branchial appendage. External lobe or palp of the first pair of maxUlEe linear, 

 not much broader than the rest. Second pair of maxillae provided with a branchial 

 appendage, the palp elongated, conical, and inarticulate. Last pair of feet similar to the 

 first in form and size ; both pairs five-jointed, and terminating in a long curved claw, 

 the last pair armed also with a short seta, which is directed upwards. Postabdominal 

 rami large, armed at the extremity with two strong curved claws, and a short sloider 

 seta ; the posterior margin also bears two long setae ; one eye. 



