6. < 



2 PROCEEDINGS OF THE NATIONAL MUSEUM, voLu 64. 



I Abdomen of male symmetrical, fifth feet of female without endopodites, exop- 

 odites of 3 segments, the distal terminating in a long spine Heterocope Sara. 

 Abdomen of male asymmetrical, fifth feet of female without endopodites, exop- 

 odites of 3 segments, the distal not terminating in a spine Epischura Forbes. 



[Exopodites of feet 1-4, 3 segmented; in female fifth feet endopodites 2 seg- 



I mented Brunella Smith. 



' ■ I Exopodites of feet 1, 1 segmented; 2-4, 2 segmented; female fifth feet without en- 



l dopodites Eurytemora Giesbrecht. 



(First antennae 20-22 segmented Pseudodiaptomus Herrick. 



■ [First antennae 25 segmented 5 



Female fifth feet without endopodites, male fifth feet with terminal hook on 

 right foot only and the hook is turned outward instead of inward. 



Poppella Richard. 

 Female fifth feet with endopodites, male fifth feet with terminal hooks on both ex- 

 opodites 9 



Female fifth feet with endopodites, male fifth feet with terminal hook on light ex- 

 opodite only, fourth feet with a long curved spine on inner distal angle on 



first basal segment Gladioferens Henry. 



Exopodites of second antennae, 5 segmented, 2, 3, and 4 being short. 



Parabroteas Mrazek. 

 Limnocalanus Daday, Gigantella Ekman, Parabroteas Ekman. 

 Exopodites of second antennae, 6 segmented, 2-5 being short. 



Sinocalanus Burckhardt. 



Exopodites of second antennae 7 segmented, 1, 3, 4, 5, and 6 being short 7 



Furca short Osphranticum Forbes. 



Furca long Limnocalanus Sars. 



In the male fifth feet both exopodites terminate in an elongated hook; in the 

 female fifth feet the exopodites are distinctly 3 segmented . 



Metaboeckella Ekman. 

 Boeckella (dilatata) Sars. 

 In the male fifth feet only the light exopodite terminates in an elongated hook, in 

 the female fifth feet the third segments of the exopodites are either rudimen- 

 tary or wanting Diaptomus Westwood. 



Hemidiaptomus Sars, Paradiaptomus Sars. 

 Endopodites of right fifth foot of male rudimentary, 1-3 segmented, without 



eetae Boeckella DeGuerne and Richard . 



Endopodite of right fifth foot of male, 3 segmented, with setae. 



Pseudoboeckella Mrazek. 



Genus BOECKELLA DeGuerne and Richard. 



Boeckia Thompson, 1883. 



Boeckella (part) DeGuerne and Richard, 1889.— Sars, 1894, 1896, 1901, 1903, 

 1904 (part).— (part) Giesbrecht and Schmeil, 1898.— Mrazek, 1901.— (part) 

 SynJ Daday, 1901. 



Boeckellopsis Mrazek, 1901. 



Pseudoboeckella Daday, 1902, 1905.— Ekman, 1905. 



Hemiboeckella, Sars, 1911. 



KEY TO SPECIES OF BOECKELLA. 



Terminal segments of exopodites of fifth feet of female armed with 2 spines. 



minuta Sars. 



Terminal segments of fifth feet of female armed with 3 spines 2 



Terminal segments of fifth feet of female armed with 6 spines 6 



Terminal segments of exopodites of fifth feet of female armed with 7 spines or 

 setae "^ 



9.< 



