THE CRUSTACEA OE NEW JERSEY. 297 



Second antennae shorter than first, basal segment long, second 

 segment less than half length of first, third segment twice length 

 of second, and fourth segment half length of third. First 

 thoracic segment joined with head to form carapace, and fol- 

 lowing six segments free. First free segment, or second thoracic 

 segment, little shorter than two following, which subequal. 

 Fourth and fifth free thoracic segments a little longer than either 

 of two preceding ones. Last thoracic segment little shorter than 

 any of four preceding segments, but long as first segment. Ab- 

 domen formed of six segments, five short, subequally long ones 

 anterior to terminal segment, which has posterior edge rounded. 

 Uropoda formed of peduncle with two branches, inner of which 

 formed of six segments and outer of but one segment. Five 

 pairs of well-developed pleopods. First pair of legs chelate, and 

 other six pairs ambulatory. Dactyl of second pair longer than 

 those following, but not as long as propodus. Length 2.5 mm. 



Description of male. — Body elongated, narrow, width one- 

 fourth its length. Head trifle longer than broad, becoming nar- 

 rowed anteriorly. Eyes distinct, large. First antennae much 

 elongated, long narrow basal segment about equals head in 

 length, second segment little more than one-third length of 

 basal, third segment one-half length of second, and flagellum 

 formed of seven or eight segments. Second antennae short, not 

 reaching end of basal segment of first antennae. First thoracic 

 segniient coalesced with head, second or first free segment short- 

 est, third and fourth or second and third segments subequal, and 

 each little longer than first, fifth and sixth or fourth and fifth 

 free segments longest and subequal, or nearly twice length of 

 first segment, and seventh or sixth free segment shorter than 

 either two preceding segm'ents, and about equals third free seg- 

 ment in length. Abdomen formed of six segments, five sul> 

 equal ones before temiinal segment, which triangular behind 

 with rounded apex. Uropoda biramous, inner branch formed 

 of six segments, and outer branch formed of only one short 

 se.gment. Five pairs of well-developed pleopods. First pair of 

 legs greatly elongate, reach some distance before head, long 

 narrow carpus reaches to end of basal segment of first antenna. 



