no.1758. OX MARINE COPEPODA \.ND CLADOCERA. 8HARPE. 425 



SYNOPSIS OF THE GENERA OF BARPACTICOIDA. 



Inner ramus of fourth leg three-segmented. Alteutha, Ameira, Ameiropsis, 

 Amenophia, Amphiascus, Aspidiscus, Bradya, Canuella, Cerviniopsis, Dactylo- 

 podilln. Dactylopusia, Danielssenia, Delavalia, Diosaccus, Ectinosoma, Euca 

 nuella, Eupelte, Euterpe, Halithalestris, Harpacticus, Herdmania, Hermanella, 

 Hersiliodes, Idomene, Idya, Tdyella, Tdyopsis, Tlyopsyllus, Longipedia, Maeh- 

 airopus, Microsetella, Microthalestris, Misophria, Nitocra, Onychocamptus, 

 Parameira, Parastenhelia, Parategastes, Parathalestris, Parawestwoodia,a Pelti- 

 dium, Phyllothalestris, Porcellidium, Psamathe, Pseudobradya, Pseudothalestris, 

 Robertsonia, Rhynehothalestris, Stenhelia, Stenocopia, Sunaristes, Tachidius, 



Ti gasti s, Thalt stris, Tigriopus, Zaus, Zosime .A. 



Inner ramus of fourth Leg two-segmented. Asellopsis, Attheyella, Canthocamp- 

 tus, Cervinia, Ceylonia, Cletodes, Cylindropsyllus, Enhydrosoma, Heteropsyllus, 

 Laophonte, Laophontodes, Laophontopsis, Leptosyllus, Lichomolgus, Marsen- 

 biotus, Mesochra, Moraria, Normanella, Paralichomolgus, Paratachidius, Phyl- 



lopodopsyllus, /'.si udolichomolgus, si, nheliopsis, T< tragoniceps B. 



Inner ramus of fourth lei; one-segmented. Laophonte I In, Pontopolites, 



Pseudanthessius ( '. 



Inner ramus of fourth leg rudimentary, of a lew spines or missing. Dyspontius, 



Nannopus, Platychelipus I). 



D Inner ramus of third leg three-segmented. No fifth legs. On weed. 20 to 40 



fathoms Dyspontius. 



Inner ramus of third leg rudimentary D 1. 



D 1. Both rami of the first leg two-segmented. Muddy bottoms between tides. 



Platychelipus. 

 Both rami of the first leg not two-segmented, the outer of throe segments, the 



inner of two segments. Muddy bottoms, brackish pools Nannopus. 



C. Inner ramus of third leg one-segmented to rudimentary. Bottom, 10 to 20 



fathoms Pontopolites. 



Inner ramus of third leg mere than one-segmented ( ' 1 . 



C 1. Inner ramus of third leg three-segmented. Littoral. Indian Ocean. 



Ps( udanthessius. 



Inner ramus of third leg two-segmented. Littoral, Indian ( >cean. Laophontella. 



B. [nner ramus of second and third leg rudimentary or obsolete. Bottom forms; 



mud . Males unknown / * ptopsyllus. 



Inner ramus of third leg two- or three- segmented B I . 



B 1. Inner ramus of third leg three segmented I! 2. 



Inner ramus of third leg two-segmented. One egg sac B 7. 



B 2. Fifth pair of legs t w ■< i-segmented . ( me egg sac B 3. 



Fifth pair of legs one-segmented. Two egg sacs B 6. 



B 3. Inner ramus of first leg forming a powerful claw, two-or-three segmented. 

 Body regions sharply defined. Moderate depths, amongsl alga?. - Laophonte. 



Inner ramus of first leg normal, not forming a powerful (daw B 1. 



B 4. Inner ramus of second and third legs normal, ool modified in any way. Fresh- 

 water ponds and streams. Bottom forms amongst deT>ris and algae. 



< 'anthocamptus > female i. 



Inner ramus of first, second, or third legs may he modified B 5. 



B 5. Inner ramus of hut the third leg modified. Freshwater lakes, ponds, etc. 



as < 'anthocamptus I tth yella I male i. 



Inner rami of the first, second, and third legs, or the second and third legs 

 modified ( 'anthocamptus > male). 



" The old name Westwoodia Dana L855, preoccupied in Hymenoptera. The name 

 Parawestivoodia here supplied. 



