I8OPODS OF NORTH AMERICA. 



679 



10 inin.: 23 mm. Uropoda 10i mm. long, a little less than half the 

 length of the body. Body, with uropoda, 33 nun. 



The head is twice as wide as long, 2 mm.: 5 mm., with the anterior 



margin widely rounded. The eyes are narrow elongate, about twice 



as wide as long, and separated in front by a distance equal to the 



length of one e} r e, 2 mm. The first pair of antennae are small and 



inconspicuous. The second pair have the first 



FlG. 720. LlGYDA BAUDINIANA 

 (AFTER IVES). X 2|. 



PlG. 721. LlGYDA BAUDINIANA. 

 FIRST LEG OF MALE. X 11. 



FlG. 722. LlGYDA BAU- 

 DINIANA (AFTER 

 DAHL). MAXILLIPED. 

 X 24| 



two articles short and subequal; the third article is as long as the first 

 two taken together; the fourth is 3 mm. long, or twice as long as the 

 third; the fifth is 4i mm. long, or one and a half times longer than the 

 fourth. The flagellum is composed of thirty-eight articles, and 

 extends to the posterior margin of the seventh thoracic segment. 

 The maxilliped has a palp of five articles. 



The segments of the thorax are subequal, with lateral margins 

 straight. The epimera are coalesced with the segments, faint depressed 

 lines indicating the place of union. 



All six segments of the abdomen are distinct; the first two are some- 

 what shorter than the three following, and have the lateral parts cov- 

 ered b} 7 the seventh thoracic segment. The third, fourth, and fifth 

 segments gradually increase in length, and have the post-lateral angles 

 produced backward in long acute processes. The sixth or terminal 

 segment has the posterior margin triangularly produced in the middle 

 in a very obtuse point, with two small triangular points just within 

 the lateral angles, which are short and not much produced. 



The peduncle of the uropoda is 4 mm. long, the branches 6i mm. 

 long, and of equal length. 



