THE BRANCHIOPODA 53 



Sub-Class Branxhiopoda. 

 Order 1. Anostraca. 



Carapace absent ; paired eyes i)edunculate ; antennae prehensile in 

 male, reduced in female ; trunk-limbs, 11 or 19 pairs, none post-genital ; 

 furcal rami unsegmented ; development with metamori^hosis./-/ 



Family Polyartemiidae. rohjurtemia, Fischer (Fig. 32). Family 

 Branchipodidae. Brcmchipus, Schafier ; Chirocephalus, Provost (Fig. 

 21); Artemia, Leach; Branchineda, Verrill (Fig. 15). Family 

 Thamnocephalidae. Thamnocephalus, Packard. 



Order 2. Notostraca. 



Carapace forming a dorsal shield ; jjaired eyes sessile ; antennae 

 vestigial ; trunk-limbs, 40 to 63 pairs, of which 29 to 52 are post^genital ; 

 furcal rami multiarticulate ; development with metamorphosis. 



Family Apodidae. Apus, Lalreille ; Lepidunis, Leach (Fig. 16). 



Order 3. Conchostraca. 



Carapace bivalved, enclosing head and 1)ody ; paired eyes sessile, 

 coalescent ; antennae biramous, natatory; trunk limbs, 10 to 27 pairs, 

 of which to 16 are post-genital ; furcal rami claw-like ; development 

 usually with metamorphosis. 



Family Lijixadiidae. Limnadia, Brongniart ; Esthcria, Riippel 

 (Fig. 17) ; Cyclcstheria, G. O. ti-M's. Family Limnetidae. Lrmnetis, Lo\en. 



Order 4. Cladocera. 



Carapace bivalved, generally enclosing body but leaving head free, 

 sometimes reduced and serving only as a brood-sac ; paired eyes sessile, 

 coalesced ; antennae biramous (except in the female Holopcdvuni\ natatory ; 

 trunk-limbs, 4 to 6 pairs, none of which are post-genital ; furcal rami 

 claw-like ; development embryonic, rarely with metamorphosis. 



Sub-Order 1. Calyptomera. 



Carapace completely enclosing body and limbs. 



Tribe 1. Ctenopoda. Six pairs of trunk -limbs all similar and 

 foliaceous. 



Family Sididae. Sida, Straus ; Latona, Straus ; Penilia, Dana. 

 Family Holopediidae. Holopedium, Zaddach. 



Tribe 2. Anojiopoda. Five or six pairs of trunk-limbs, first two 

 pairs more or less prehensile. 



Family Daphniidae. Daphnia, O. F. Miiller (Fig. 18); Moina, 

 Baird ; Sim,ocepJialn>!, Schodler {Simosa, Norman). Family Bosminidae. 

 Bosmina, Baird. Family Lyxcodaphniidae. Ilijocnjpttf.'^, G. O. Sars ; 

 Macrothrix, Baird. Family Lyxceidae. Lynceii.% O. F. Miiller ; 

 Chydorus, Leach ; Eurycercus, Baird ; Plenroxus, Baird (Fig. 26) ;, 

 Monospilus, G. 0. Sars. 



