THE CRUSTACEA OF NEW JERSEY. 251 



on extreme lateral margins of head. Head above, from front 

 to hind edges, with prominent elevation bearing two tubercles, 

 one each side of median line, which appear, as viewed dorsally, 

 to project forward beyond frontal excavation. First antennae 

 with basal segment large and somewhat expanded, second and 

 third siibequal segments only little shorter than first, and fourth 

 segment little long'er than third. First antennae reach to end of 

 second segment of second antennae. First segment of second 

 antennae short, second long segment equals third and also 

 equals first two segments of first pair of antennae, fourth 

 segment nearly twice length of third, and fifth segment 

 shorter than fourth or only about one and one-half times longer 

 than third. Flagellum of second antennae about as long as 

 fourth segment of same organ. Retracted second antennae reach 

 to hind edge of fifth thoracic segment. Maxillipeds with palp of 

 four segments. Second, third and fourth thoracic segments trifle 

 longer than others, which latter subequal. First two thoracic 

 segments with lateral parts formed into very acute processes, as 

 a single process on each side of segments. Acutely produced 

 epimeron lies closely anterior to each of processes mentioned, 

 though below lateral part of segment in a lower plane. Epi- 

 meron of second segment bilobate, and as seen dorsally conceals 

 very acute lower lobe. Third and fourth thoracic segments with 

 lateral portions produced on each side as two acute processes, 

 as one larger and anterior, and a smaller posterior. Epimera of 

 these segments inconspicuous, small, acute, placed just below 

 lateral parts about middle of segment. Last three segments with 

 anterior portions acutely produced, acute epimeron occupying rest 

 of lateral edge, and posterior half of lateral portion of segment 

 not produced. On each side of first four thoracic segments 

 small tubercle near hind edge in median line. Abdomen formed 

 of a single segment and about one-third distance from base to 

 end each side of lateral edge, produced in acute triangular pro- 

 cess. Also about two-thirds distance from base to end sides of 

 abdomen angulate, and from this point lateral edges rapidly con- 

 verge to triangulate end, which latter rounded posteriorly. Legs 

 mostly of similar structure. Color usuallv dull neutral tint, and 



