6 THE ENTOMOSTRACA OF 



usually placed behind the lower or most ventral spots of the front rank. (See Plate I, 

 figs, la, I d, Ic, 5 b, 8 a, 8 e, 8/.) 



c. A system of four or five sub-oval spots, arranged in a transverse row, more or 

 less curved, and set in a linear sulcus. (See Plate II, figs. 1 a, 1 e, \f; Plate IV, 

 fig. 6 f/.) 



The lucid spots in the CytJierina are not yet well examined. In some species they 

 are very similar to one or other of the systems above described as occurring among 

 the Cyprince, — in others the modifications are more distinct, — and, lastly, in Cytherella 

 the aiTangement of the spots resembles that of some Cypridince. 



The following is Mr. Dana's classification^ of the Ostracoda {Cypridacea and 

 Cyproidea, Dana), founded on the study of the limbs or articulate appendages : 



^n5e— CYPROIDEA vel OSTRACODA.^ 



In the Cyproidea there are two pairs of antennae and a pair of mandibles, and the 

 pairs of appendages posterior to the mandibles — in number four pairs — are divided 

 variously between the mouth and the legs, as follows : 



1. One pair of maxillse and three pairs of legs, as in Cythere. 



2. Two pairs of maxillse and two pairs of legs, as in Cypris, Concliada, and 



Halocypris. 



3. Three pairs of maxillse and one pair of legs, as in Cypridina. 



Fam. I. Cyprtd^. Antenna seeimdce subteretes, 3 — 5 articidata. Mandiiulce apice 

 prodMctcB et denticulate et later aliter j^a^nyerm, palpo ad mandibulce apicem remoto. Oculi 

 pigmento unico minuto conjuncti, lenticidis duobus sphcericis. Pedes duo vel plures tenuiter 

 pediformes. 



Sid}-fam. 1. Cyprin^ {Cypridida, Baird). Pedes numero quatuor ; anteriores tenues 

 pediformes, 2JOsteriores debiles. Mdomen elongatum stylis duobus confectum. 



Genus 1. Cypris, Miiller. Antenna secunda ad articuUtertii apicem bene setigerce. 

 Species natatorice. 



Genus 2. Candona, Baird. Antennce secundce ad articuli tertii apicem vix setiyera. 

 Species yressoria. 



' 'Exploring Expedition: Crustacea,' p. 1277, &c. 



- Dr. Baird's classification of tliis group is very similar to Dana's, viz. : 



Ostracoda. 



Cyprididse, CytheridEe, Cypridinadse. 

 In Dr. Baird's work the term "Cypridse" is corrected as an erratnm at p. viii. 



