646 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



longer than the fifth. The nagellum is composed of two articles, the 

 first of which is about half as long as the second. The second antenna 1 

 extend to the middle of the first thoracic segment. The maxilliped has 

 a palp of three articles. The palp of the mandibles is wanting. 



The first segment of the thorax is about one and a half times longer 

 than any of the others, which are subequal. The lateral parts of the 

 first segment are produced backward posteriorly, and anteriorly they 



are produced surround- 

 ing the head and extend- 

 ing to its anterior mar- 

 gin. The lateral mar- 

 gins of the first segments 

 curve slightly upward. 

 There are no epimera 

 separated off on any of 

 the segments from 

 above. The epimera of 

 the first two segments 

 are distinct on the under- 

 side. They are very 

 small. Those of the first 

 segment do not extend 

 the entire length of the 

 segment, but are repre- 

 sented only at the pos- 

 terior extremitj^. 



The abdomen is not 

 narrower than the tho- 

 rax. The lateral parts 

 of the first two segments 

 are covered by the 

 seventh thoracic seg- 

 ment. The sixth, or ter- 

 minal, segment is 2 mm. 

 wide at the base, becom- 

 ing constricted about the 

 middle, where it is 1 mm. 

 wide, and then expanding to a truncate extremity, which is 2 mm. wide. 

 The length of the terminal segment is H mm. The basal article or 

 peduncle of the uropoda is narrow and elongate, about twice as wide as 

 long, and fills the space between the lateral parts of the fifth abdominal 

 segment and the terminal abdominal segment. The outer branch is 

 extreme^ small, and is inserted on the inner margin of the peduncle, 

 about halfway between the anterior and posterior end. The inner 



e f fi 



Fl&. 689. CUBARIS MURINA. a, MAXILLIPED. X 51|. b, SEC- 

 OND MAXILLA. X 51|. C, FIRST MAXILLA (OUTER LOBE). X 



51|. d, TERMINAL SEGMENT WITH UROPODA. x 15}. e, MAN- 

 DIBLE, x 51}. /, FIRST MAXILLA (INNER LOBE), x 51}. r/, 

 UROPOD. x 27}. (FROM UNDERSIDE.) 



