THE CRUSTACEA OF NEW JERSEY. 45 



(Litnnetis) to sixty-nine (Binoculus), and often irrelatively 

 repeated, this signifying inferiority. Eyes sessile and united 

 into a single mass, or sometimes stalked (Branchipodidce). 

 Telson usually large and spiny, bearing in all genera pair of 

 caudal appendages, probably homologous with the limbs. All 

 hatch from the egg in a nauplius form, as in the copepods, and 

 all have three pairs of appendages corresponding to the two 

 pairs of antennae and mandibles of the adult. 



Crustacea living mostly in fresh-water pools or in brine lakes 

 and ponds (Artemia), often where the water completely evapor- 

 ates in summer. The eggs, after being fertilized and borne about 

 for a time under the shell or in egg-sacs, finally are allowed 

 to drop to the bottom of the pool. There they lie after the 

 water disappears or evaporates, remaining in the dry mud in 

 drought or hot weather until the rains of autumn refill the ponds,. 

 when the young hatch out and begin the life cycle anew. 



Family BRANCHIPODID^. 



Body soft, long, delicate, slender, without carapace. Head 

 small. Eyes stalked. A distinct median ocellus. First antennae 

 filiform. Second antennas stout in males, formed as clasping 

 organs. Frontal appendages often present. Eleven to nineteen 

 pairs of branchial or respiratory feet, without gnathobase or 

 coxal lobe. Other lobes (endites), especially fifth and sixth, 

 broad and foliaceous, with a gill and simple rounded flabellum. 

 First and second uromeres with a penis in male and egg-pouch in 

 female. Specialized abdomen with eight or nine segments, not 

 bearing appendages. TeiTninal segment bears pair of filamental 

 not jointed setose appendages. Larva a nauplius. 



Sub-Family Branchipodin^. 



Eleven pairs of natatory feet, nineteen in Polyartemia, with 

 outer endites moderately broad. Abdomen slender, cylindrical. 

 Terminal abdominal segment with two filamental setose caudal 

 appendages. 



