28 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



uropoda are double bi'anched, the inner branch being composed of six 

 articles, the outer one being composed of one short article. 



The tirst pair of legs are greatly elongated and extend some distance 

 in front of the head. The carpus is long and narrow and extends to 

 the end of the basal article of the first pair of antennae. The propodus 

 has the distal extremity produced in a long, narrow, strongly curved 

 process or thumb, which is armed within on the inner side with two 

 triangular processes or teeth. The dactylus is also long and narrow, 

 strongU" curved, and furnished with stiff hairs on the inner margin. 

 All the other legs are ambulatory. 



Description of female. — Body narrow, elongate, about five times 

 longer than wide, \ mm.: ^\ mm. 



Head longer than wide, becoming gradually narrower from the base 

 to the anterior end. The anterior margin is very slightly produced in 

 an obtuse point. The eyes are small, round, composite, and situated 

 at the antero-lateral angles of the head. The tirst pair of antennje have 

 the first article long and robust; the second is less than half as long as 

 the first; the third is a little longer than the second. This article in 

 some specimens is subdivided. The second pair of antennte are shorter 

 than the first pair. The first article is long; the second article is less 

 than half as long as the first; the third is twice as long as the second; 

 the fourth is half as long as the third. 



The first segment of the thorax is united with the head to form a 

 carapace. The following six segments are free. The first free seg- 

 ment or second thoracic segment is a little shorter than the two fol- 

 lowing, which are subequal. The fourth and fifth free segments or 

 the fifth and sixth segments are a little longer than either of the two 

 preceding ones. The last segment is a little shorter than any of the 

 four preceding segments, but is as long as the first segment. 



The abdomen is composed of six segments, five short ones, subequal 

 in length, anterior to the terminal segment, which has the posterior 

 margin rounded. The uropoda are composed of a peduncle with two 

 branches. The inner branch is composed of six articles. The outer 

 branch has only one article. 



There are five pairs of well-developed pleopoda. 



The first pair of legs are chelate. The other six pairs are ambula- 

 tory. The dactylus of the second pair of legs is longer than in those 

 following, but is not as long as the propodus.* 



LEPTOCHELIA DUBIA (Krciyer). 



Tanah duUm Kr0yer, Nat. Tidsskrift, IV, 1842, p. 178, pi. ii. figs. 20-22. 

 Leptochelia dubia Richardson, Trans. Conn. Acad. Sciences, XI, 1902, p. 279. 

 Leptochelia incerta Moore, Bull. U. S. Comm. of Fish and Fisheries, Pt. 2, XX, 

 1902, pp. 165-166. 



" See Harger for full description of this species. 



