394 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



FIG. 438. COLIDOTEA ROSTRATA. a, LEG 

 OF SECOND PAIR. X 15}. 6, MAXIL- 

 LIPED. X 27}. 



middle of the lateral margin. 



the first article almost inconspicuous from a dorsal view; the second 



article is large; the third is shorter than the second; the fourth and 



fifth are subequal and each is one and a half times longer than the third. 



The flagellum is composed of six and seven articles in one specimen; 



of four and five in the other. The palp of the maxilliped is composed 



of two articles. When retracted the 

 second antennee extend to the posterior 

 margin of the second thoracic segment. 

 The first segment of the thorax has 

 the antero-lateral angles produced to 

 surround the posterior half of the head. 

 The second segment is a little longer 

 than the first; the third, fourth, and 

 fifth segments are the longest; the sixth 

 is about equal in length to the second; 

 the seventh is as long as the first. There 

 is no indication of epimera on any of 

 the first four segments. The epimera 

 of the fifth segment are narrow, almost 

 inconspicuous plates, placed about the 

 The epimera of the sixth and seventh 



segments are wide plates occupying the posterior half of the lateral 



margin. 

 The abdomen is composed of a single segment with a suture line on 



either side at the base. Its posterior margin is rounded. 



All the legs, with the exception of the first pair, have a small rounded 



carina on the basis at the proximal extremity. On the four posterior 



pairs of legs this carina becomes more triangular in shape. 



63. Genus EDOTEA Gue>in-Meneville. 



Flagellum of second antennae rudimentary. Maxillipeds have a palp 

 composed of three articles. Epimera of all the segments of the thorax 

 firmly and perfectly united with the segments. Abdomen composed 

 of a single segment, with lateral incisions or suture lines at the base, 

 indicating another partly coalesced segment. All the legs prehensile. 



ANALYTICAL KEY TO THE SPECIES OF THE GENUS EDOTEA. 



a. Antero-lateral angles of head produced into horn-like projections. Lateral mar- 

 gins of thoracic segments produced into horn-like projections. Four tubercles 



situated on the dorsal surface of head Edotea acuta Richardson 



a' '. Antero-lateral angles of head not produced into horn-like projections but 

 rounded. Lateral margins of thoracic segments not produced into horn-like 

 projections. Two tubercles situated on the dorsal surface of head just back 

 of the anterior margin. 



b. Lateral margins of thorax nearly straight. Lateral incisions at base of termi- 

 nal segment of body slight. Second pair of antennae extend to the middle 

 of the fourth article of the antennae of the first pair; second article half as 



