620 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



of the second antenna has the inner margin expanded into a spine- 

 like process, which is very conspicuous. The maxillipeds have a 

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



FlG. 669. PORCELLIO 8PINICORNIS (AFTER SARS). a, HEAD. 6, DoBSAL VIEW OF FEMALE. C, SEC- 

 OND ANTENNA, d, LAST TWO SEGMENTS OF ABDOMEN AND UROPODA. e, FIRST LEG OF FEMALE. 

 f, LAST SEGMENT OF ABDOMEN. g, FIRST PLEOPOD OF MALE. h, UROPOD. i, FLAGELLVM. j, SEV- 

 ENTH LEG OF FEMALE, k, SECOND PLEOPOD OF MALE. I, SEVENTH LEG OF MALE. 



The first segment of the thorax is 2 mm. in length, a little longer 

 than any of the others, which are subequal and each is H mm. in 

 length. The epimera are not separated off from the segments. 



