96 



BULLETIN 54, UNITED STATES NATIONAL MUSEUM. 



lateral angles of the head. The tirst pair of antenna; have the first 

 two articles short and subequal; the third is as long- as the tirst two 

 taken together. The flagellum is composed of seventeen articles and 

 extends to the antero-lateral angles of the first thoracic segment. 

 The second antennge have the tirst two articles short and subequal; 

 the third and fourth are subequal and each is as long as the first and 

 second together; the fifth is a little longer than the fourth. The 

 flagellum is composed of sixteen articles and extends to the posterior 

 margin of the first thoracic segment. The maxillipeds are composed 



of seven articles. The 

 ^ palp of the mandibles 



is composed of three 

 articles. 



The first, fourth, fifth, 

 and sixth segments of 

 the thorax are subequal 

 in length, being each 2 

 mm, long. The second, 

 third, and seventh are 

 subequal and each is 1^ 

 mm. in length. The 

 epimera are distinctly 

 separated from the seg- 

 ments on all but the tirst 

 segment. In the epim- 

 era of the sixth and sev- 

 enth segments the outer 

 post-lateral angle is 

 acutely produced be- 

 yond the posterior mar- 

 gin of the segments. 



All six segments of 

 the abdomen are distinct. 

 The last segment is tri- 

 angular in shape, with 

 the apex notched. The uropods do not extend beyond the extremity 

 of the terminal abdominal segment. Both are of equal length, the 

 outer branch being only one-third as wide as the inner branch. There 

 is a notch on the exterior margin of the inner branch near its poste- 

 rior extremit3\ The inner angle of the peduncle of the uropoda is 

 produced and extends two-thirds the length of the terminal abdominal 

 segment. 

 The tirst three pairs of legs are prehensile; the last four pairs ambu- 



Fk;. 77._ClROLANA CONCHARUM (AFTER HaRGEK). O, LaST SEG- 

 MENT OF ABDOMEN WITH UROPODA. X 6. 6, LEG OF FIRST 

 PAIR. X 8. C, Leg OF FOURTH PAIR. X 8. rf, LEG OF SEVENTH 

 PAIR. X 8. 



