2 PROCEEDINGS OF THE NATIONAL MUSEUM vol.82 



3. Exopods of feet 1 to 4, 3-segmented ; in female fifth feet endo- 



pods 2-segiiiented Brunella Smith 



Exopods of first feet, 1-segmeuted ; feet 2 to 4, 2-segmented ; 

 female fifth feet without endopods Eurytemora Giesbrecht 



4. First antennae 20- to 22-segmented 5 



First antennae 25-segmented 6 



r>. Second segment of basipod of left fifth foot of male with long 



curved projection from inner border Schmackeria Poppe and Richard 



Second segment of busipod of left fifth foot of male without long 



curved projection from inner border Pseudodiaptomus Herrick 



G. Female fifth feet without endopods, male fifth feet with terminal 

 hook on I'ight foot only, and hook turned outward instead of 



inward Poppella Richard 



Female fifth feet with endopods, male fifth feet with terminal 



hooks on both exopods 10 



Female fifth feet with endopods, male fifth feet with terminal 

 hook on right exopod only, fourth feet with a long curved 

 spine on inner distal angle on first basal segment Gladioferens Henry 



7. Exopods of second antennae 5-pegmented, segments 2, 3, and 4 



being short Parabroteas Mrdzek' 



Exopotis of second antennae 0-segmented, segments 2 to 5 being 



short Sinocalanus Burckhardt 



Expods of second antennae 7-segmented, segments 1, 3, 4, 5, and 



6 being short . 8 



8. Furca short Ospliranticum Forbes 



Furca long limnocalanus Sars 



9. In male fifth feet both exopods terminating in an elongated 



hook ; in female fifth feet exopods distinctly 3-segmented. 



Metaboeckella Ekman ' 

 In male fifth feet only right exopod terminating in an elongated 

 hook ; in female fifth feet third segments of exopods are 

 either rudimentary or lacking 11 



10. Endopod of right fifth foot of male rudimentary, 1- to 3-seg- 



mented, without setae Boeckella de Guerne and Richard 



Endopod of right fifth foot of male 3-segmented, with setae. 



Pseiidoboeckella Mrazek 



11. Female abdomen 2-segmented, maxillipeds prominent 12 



Female abdomen 3-segmented, maxillipeds not prominent 13 



12. Left exopod of male fifth foot armed with hook and acute spine. 



Lovenula Schmeil ^ 

 Left exopod of male fifth foot armed with two stout spines and 

 hyaline lamella Paradiaptomus Sars 



13. Exopod of left fifth foot of male with stout curved spine in 



posterior surface and a small terminal spine Metadiaptomus Methuen 



Exopod of left fifth foot of male armed with two small ap- 

 pendages that may be either digitate or spiniform_ Diaptomus Westwood ' 



* Synonyms : Limnocalanus Daday, Qigantella Ekman, Parabroteas Ekman. 

 'Synonym: Boeckella (dilatata) Sars. 



* Synonym : Adiaptomus Cooper. 



' Synonym : HemicUaptomii^ Sars. 



