pais, 
5 
¢ 
_ Genera of ‘Cyclopacea. 229 
subcheliform, larger than the first pair of legs, (nearly as in the genus 
Ergasilus. ) E 
Genus 2. Anraria, Dana. Similar to Coryc@us, but having the sec- 
ond pair of antenne terminating in a few movable sete, and smaller than 
the first pair of legs. (I am not satisfied that these specimens are not 
the female of the Coryczi.) f 
Genus 3. SappHirina, Thompson. Body much depressed ; antennz 
as in Coryceus; abdomen 5 or 6-jointed, the basal joint in the female 
abruptly narrower than the thorax, and having a pair of short appen- 
dages ; external ovaries two. 
Family 5. Mrractom. Antenne as in Setella; external ovary 
single. 
Genus 1. Miracta, Dana. Body not depressed, nearly as in the 
Arpactide, the abdomen 5 or 6-jointed and not abruptly narrower than 
the thorax; anterior antenne nearly as in Setella, with a short ap- 
pendage near the middle; second pair of antenne terminating ina few 
movable sete ; beak with two cultriform appendages ; first pair of legs 
subcheliform. 
The distinctions in the above genera rest to a considerable ex- 
tent upon the use of different organs for grasping in the union 
of the sexes. In Cyclops and Arpactus, both anterior antenne 
of the male are subcheliform for this purpose ; in Pontella and 
Candacia, the right antenna and right posterior thoracic leg is 
thus modified in the male; in Zuchirus, both posterior thoracic 
legs are very much elongated; in Calanus, the first pair of legs 
are long and have an outward lateral motion for the purpose ; 
in Coryeeus the second pair of antenne subserves this end, and 
in Antaria the first pair of legs are large and subcheliform ; in 
Setella the same end appears to be secured by the first pair of 
natatories. 
The genera of Calanide: differ also in the relative development 
of the maxillipeds and first pair of legs. In Pontella, Acartia, 
and Scribella, the maxillipeds are largest. In Pontella and Acar- 
tia they are straight, with long setulose sete directed forward so 
as to form a kind of scoop-net. In Scribella they are flexed like 
the letter L. In Calanus, Euchirus and Candacia, the first pair 
of legs are larger than the maxillipeds; in Calanus they are long 
regard to their nature which I can suggest, is their possible connection with phos- 
phorescence. But such an arrangement for this end is not probable ; and more- 
over I was never satisfied that the species were phosphorescent. 
