2280 CRUSTACEA. 



Cypridina it is a broad maxilla, setigerous at its inner margin, and 

 having a single broad lateral joint edged with a few setae. 



The fourth pair is a slender five-jointed ovarian leg, in Cypris; a 

 pediform leg, like those of the preceding pair, in Cjthere ; a flexible 

 linear or vermiform ovarian leg, in Cypridina; and a short two- or 

 three-jointed leg, ending in some shortish setae, in Conchoecia and 

 Halocypris. 



Besides these appendages, Conchoecia and Halocypris have a move- 

 able spicula, either dart-like in form or cylindrical, situated between 

 the anterior antennae, and arising apparently from the same base as 

 these organs. It may be projected out of the shell. 



The eyes in the Cyproidea are either two simple eyes on a single spot 

 of pigment, or two distinct compound eyes. The latter is the case 

 only in the genus Cypridina. 



From this partial review of the organs in the Cyproidea, it is appa- 

 rent that there are two types of species, distinguished more especially 

 by the second antennae and mandibles, though also distinct in other 

 organs. One includes Cypris and Cythere, which belong to fresh 

 waters or sea-shores j the second, the other genera, which are confined 

 apparently to the purer ocean waters. These groups or families we 

 distinguish as the Cyprus and Halocyprid^e. Each of these families 

 includes two known subfamilies; the first, Oy prince and Cytherince; 

 the second, Cypridinince and Halocyprince. These subdivisions and 

 the included genera may be characterized as follows : — 



Fam. I. CYPRIDJE. 



Antennae 2dae subteretes, 3-5-articulatae. Mandibulae apice pro- 

 ducts et denticulatae et lateraliter palpigerae, palpo ab mandibulae 

 apice remoto. Oculi pigmento unico minuto conjuncti, lenticuhs 

 duobus sphericis. Pedes duo vel plures tenuiter pediformes. 



Subfam. 1. CYPRIN^E.*— Pedes numero quatuor ; anteriores tenues 

 pediformes, posteriores debiles. Abdomen elongatum stylis duobus 

 confectum. 

 G-. 1. Cypris, Midler. — Antennae 2das ad articuli 3tii apicein bene setigerse. 

 Species natatorise. 



* Cypridx, Baird, Brit. Entomost., 139. 



