572 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



head in a small lobe. Eyes absent. The first pair of antennas are com- 

 posed of ''three"' articles. The second pair are composed of "five" 

 articles. Both pairs are small and inconspicuous in a dorsal view. 



The seven segments of the thorax are distinct. Ovarian bosses are 

 present on the sub-lateral anterior portion of the lateral margins of 

 the first four segments. The epimera of these segments are very 

 narrow plates, lateral to the ovarian bosses. On the last three seg- 

 ments the epimera are narrow plates occupying the anterior portion 

 of the lateral margin. 



All six segments of the abdomen are distinct. The lateral parts of 

 these segments are not produced. The lateral margins are straight. 

 The sixth or terminal segment is very small and posteriorly truncate. 

 There are no uropoda. The pleopoda are represented by fleshy ridges. 



There are live pairs of incubatory lamellae. The distal portion of 

 the first pair has the posterior margin not produced in a lobe. 



The seven pairs of legs are small, with prehensile hands and the 

 basis furnished with a high, more or less rounded, carina. 



The male is elongate, 3 mm. long and 1 mm. wide. Head with the 

 anterior margin rounded. Eyes distinct. The first pair of antennae 

 are composed of three articles. The second pair are composed of four 

 articles. All the thoracic segments are distinct, with straight lateral 

 margins. The legs are prehensile. All the segments of the abdomen 

 are coalesced in a single segment which tapers posteriorly to a point. 

 There are no uropoda or pleopoda. 



Family XXI. DAJID^. 



Body of female symmetrical. Segmentation, when present, only 

 visible in the middle of the dorsal surface. 



Palp of maxillipeds wanting. 



Incubatory plates small, often reduced in number. Incubatory 

 pouch confined to the lateral parts of the body, one cavity on either 

 side. 



Only four or five pairs of legs present, crowded around the oral area. 



Pleopoda usually rudimentary or entirely wanting. 



Uropoda developed or absent. 



Male with the first thorasic segment coalesced with the head. 



Parasitic on Schizopoda. 



ANALYTICAL KEY TO THE GENERA OP THE FAMILY DAJID.E. 



a. Body of female distinctly segmented in the dorsal region. Uropoda present. 



First pair of pleopods well developed; following pairs rudimentary. 



Genus Dajus Kr0yer 

 a'. Body of female without any trace of segmentation. Uropoda absent. Pleopoda 



wanting Genus Holophryxus Kichardson 



See G. O. Sara for characters of family, Crust, of Norway, II, 1899, p. 221. 



