574 BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



transversal sutures denning the segments. Metasome rather short 

 and but slightly projecting, being conically tapered; its first segment 

 much larger than the others. Oral area placed wholly in front, com- 

 paratively broad, semicircular. Antennulte very short, 3-articulate; 

 antennae much more slender and extended laterally, being composed 

 of 8 or 9 articulations successively diminishing in size distally. First 



FIG. 638. DAJUS MYSIDIS (AFTER SARS). a, VENTRAL VIEW OF FEMALE (ADULT). 6, ORAL AREA. 

 c, DORSAL VIEW OF ADULT FEMALE, d, RIGHT PART OF POST-ORAL AREA WITH CORRESPONDING FIVE 



LEGS AND INCUBATORY PLATES, e, LEG OF MALE. /, MAXILLIPED. g, MALE (DORSAL VIEW), h, 



LATERAL VIEW OF MALE, i, HEAD OF MALE (VENTRAL SIDE), j, SPECIMEN OF MYSIS MIXTA INFESTED 



WITH PARASITE, k, UROPODA OF MALE. /, UROPODA OF FEMALE, m, YOUNG FEMALE (VENTRAL 



VIEW), n, YOUNG FEMALE (DORSAL AND VENTRAL VIEWS), o, YOUNG FEMALE (LATERAL VIEW). 



pair of incubatory plates larger than the next succeeding ones and 

 divided by a transversal fold into two segments; last pair, extending 

 behind the oral area, rather broadly overlapping each other in the 

 middle. Body of young female narrower, subclavate, with the nieso- 

 sonie more distinctly segmented and the metasome more produced; 



