THE CRUSTACEA OF NEW JERSEY. 129 



lateral contours, and fourth segment rather well emarginated 

 posteriorly. Abdomen broad anteriorly, first segment becomes 

 narrow behind, and remaining segments of nearly equal narrow 

 width. Stylets usually nearly straight, sometimes well diverg- 

 ing, and their width one-third to one- fourth their length. Outer 

 edge of each stylet in female with a series of curved hooks or 

 spinules, extends from insertion of outer seta to base. Outer 

 and inner setae shortest, similar. Median pair of setfe long, and 

 inner usually twice length of outer, sometimes equals half length 

 of entire animal. All setae more or less plumose, especially dis- 

 tally. 



Antennae twelve-segmented, last three usually long and slender, 

 and reach back to third or fourth segments. Antennal bristles 

 usually moderate. Swimming-feet with spines as three, four, 

 four, three. Fifth foot one-segmented, plate-like, very strong 

 serrate spine on inner side, at tip very long, slender seta parallel 

 to spine, and delicate little seta projects outward on outer side. 



Egg-sacs usually long, wdth many or a few eggs in a spherical 

 mass or sometimes taper to sharp point below, and often stand 

 out from abdomen at wide angle. 



Color often verv dark or dusky, with violet and purple tints in 

 many cases. Length 1.47 mm. 



Remarks. — A common and abundant species most everywhere, 

 and largely cosmopolitan in distribution. I have found it near 

 Florence and Trenton during the summer of 191 2. It is quite 

 variable. 



Trihe Podoplea. 



Mouth furnished with organs developed for mastication, as 

 foot-jaws. Branchiae few, attached to mouth-organs. Body 

 divided into several verv distinct rings, and with an envelope 

 inclosing head and thorax, in form of buckler. Five pairs of 

 feet, mostly adapted for swimming. Articulations more or less 

 cylindrical and serve animal for purpose of locomotion. One 

 eye. Two' pairs of antennae, of which one pair used as organs 

 of motion. Ovary external. Free-swimming. 

 9 MU 



