4U 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



little longer than the tirst and half as wide; the third is half as long- as 

 the second. The flag-elluni is composed of six articles and extends to 



the middle of the fifth article of the peduncle 

 of the second antenuiB. The basal article of 

 the second antennae is short; the second article 

 is about as long as the first; the third is as 

 long as the second; the fourth is equal to the 

 first three taken together; the fifth is one and 

 a half times longer thaa the fourth. The 

 tiagellum is composed of forty-three articles 

 and extends to the posterior margin of the 

 sixth thoracic segment, and is 9 mm. long. 

 The maxillipeds have a palp of five articles. 

 The palp of the mandibles is wanting. 



The first segment of the thorax is a 

 little longer than an}- of the others, being 

 li mm. long. The others are subequal and 

 each is 1 mm. in length. The lateral 

 margins are straight and entire and the 

 epimera are not separated ofi" from the 

 segments. 

 The abdomen is composed of one short seg- 

 ment, visible only in the middle of the dorsal surface and covered at 

 the sides by the last thoracic segment, and one large terminal segment. 



Fig. 464.— Mancasellis macrou 

 Ris (After Garmax). 



<■ d < ./■ 



Fi(i. 4(;f).— Mancaselu's macrourus. a, First leg. x l.'>i. />, Maxilliped. x 27j. r, Second ma.\- 

 iiLA. X 27}. d, First maxilla, x 27^. e, Mandible, x 27^. /, Uropod. x 15^ 



