DAPHNIOIDEA. 1267 



G. 2. Evadne, Loven* — Corpus postice deflexum, abdoraine non reflexo, capite 

 vix discreto. Testa postice subacuta. Kami antennarum postioarum 3-articulati. 



G. 3. Pleopis, Dana. — Corpus postice non deflexum, fere rectum; abdomen eras- 

 sum extremitate furcatum, setis nullis. Testa postice rotundata. Rami anten- 

 narum posticarum 3-articulati. 



Family PENILID^E. 



Genus DAPHNELLA, Baivd. 



The legs in this genus are much narrower than in the Daphnidse. 

 They have two branches, and differ not very much from the natatory 

 legs of other Entomostraca. The first pair has both branches narrow 

 and two-jointed; the longer as well as the basal part is ciliated below. 

 The fourth pair has the shorter branch considerably the broadest and 

 lamellar, and it is furnished with a few distant setae, approximating 

 to the" form in Penilia. The abdomen is but little inflexed. The 

 dorsal setae are situated on a common prominence, and are rather long. 



The head is not shorter than its breadth, either in a lateral or vertical 

 view, and is arcuate or slightly angled below ; it bears the superior 

 antennae from its lower side remote from the base of the head. One 

 of the branches of the posterior antennae (the shorter, when they differ 

 in length) has the second joint short, as in Penilia, and the first joint 

 of the same branch very near base has an appearance of another arti- 

 culation;*)" the other branch has the first joint shorter than the second, 

 unlike Penilia. It is an interesting fact, that the fresh waters of the 

 Eeejee Islands should afford species of this genus as well as those of 

 Great Britain. 



* Zoologisk Bidrag, 1; Edwards, Crust., iii. 390; Goodsir, Edinb. Jour., xxxiii. 366; 

 Baird, Brit. Entomost., 114. 



f The branch which is three-jointed in Sida is the other one, not that in which the 

 terminal joint is short. 



