Koo LR cl 
"which it TIC. abdomen not inflexed. 
226 
Eyes simple. 
Antenne two pairs ; the second often pediform or subcheliform. 
IMandibles 4—5-spino-dentate, sometimes having a sung | 
palpus. 
Mazille, one pair; sometimes with a subnatatory RN 
Mazillipeds, one pair; sometimes simple maxille ; at others, 
prehensile, but never at all natatory. 
F'eet, 6 pairs ; the first often prehensile, and subcheliform, and 
either straight or geniculated ; nezt four pairs, bifid and natatory ; 
the sizth, or posterior, (corresponding to another pair of natatories, NS 
rudimentary or obsolete, but in some genera, large in the male, E m 
with the right one sübelichfetin. 
Abdomen, 2 to 6-jointed; two caudal appendages fonzisidé 
with 5 setee, some of which may be obsolete ; occasionally short 
appendages to one or both of the first and second joints. 
Kixternal ovaries, one or two, proceeding from the second joint. 
of the abdomen, or what corresponds thereto. ege 
'T'he genera of this tribe here described may be distributed as 
follows : 
l. Palpi of the mandibles and. maxille obsolete or. m 
eyes with simple spherical lenses. 
Family 1l. Cvcrorripnx. External ovaries two. Eyes two, on 
a single spot of pigment. Abdomen vro y d than the. 
cephalo-thorax. 
Genus 1l. Cvcrors, Müller. 'lhe two anterior antennze subeheliform 
in the male. (Fresh-water species.) ; 
Family 2. AngPAcTIDzm.  Externalovary single. Eyes two on 
a single spot of pigment. — À short appendage near middle of an- 
terior antenne. — Abdomen seldom abruptly narrower than the 
cephalo-thorax. (Marine species.) 
Genus 1. AnPacrTUS,* Milne Edwards. | Anterior antennze short, and 
both, in the male, subcheliform ; posterior pair terminating in a us 
of movable setze.  Prehensile feet subcheliform. 
ET. 
i 
* Milne Edwards has instituted the genus Cyclopsina for a group near Arpactus 
having the posterior maxillipeds notsubcheliform. In the species examined by the 
writer the subcheliform character is constant, but the movable finger i is sometimes 
5 "] " / is 
We T Te 
d ie r^ 
eot * 
reduced to a very short hook. 
