6 THE ENTOMOSTRACA OF 



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

 figs. 10,16,1c, 5 6, 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 <?, If; Plate IV, 

 fig. 6 d.) 



The lucid spots in the Cytherina 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 Cyprina, — in others the modifications are more distinct, — and, lastly, in Cytherella 

 the arrangement of the spots resembles that of some Cypridina. 



The following is Mr. Dana's classification 1 of the Ostracoda (Cypridacea and 

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



Tribe— CYPROIDEA vel OSTRACODA. 2 



In the Cyproidea there are two pairs of antenna? 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 maxillae and three pairs of legs, as in Cythere. 



2. Two pairs of maxillae and two pairs of legs, as in Cypris, Conchacia, and 



Halocypris. 



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



Fam. I. CypriDjE. Antenna secundce subteretes, 3 — 5 articulates. Mandibulcs apice 

 products et denticulate et lateraliter palpiyera, paljjo ad mandibula apicem remote Oculi 

 piymento unico minuto conjuncti, lenticulis duobus spharicis. Pedes duo vel plures tenuiter 

 pediformes. 



Sub-fam. 1. Cyprina {Cypridi da, Baird). Pedes numero quatuor ; anteriores tenues 

 pediformes, posteriores debiles. Abdomen elonyatum stylis duobus confectum. 



Genus 1. Cypris, Miiller. Antenna secunda ad articuli tertii apicem bene setiy era. 

 Species natatoria. 



Genus 2. Candona, Baird. Antenna secunda ad articuli tertii apicem vix setiyera. 

 Species yressoria. 



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



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



Ostracoda. 



Cyprididse, Cytheridse, Cypridinadse. 

 1 1! Dr. Baird's work the term "Cypridse" is corrected as an erratvm at p. viii. 



