NO. 1479. 



NEW ISOPOD CRUSTACEAXS—BICHARDSOX. 



13 



Fig. 10. — ZuzARA integr.\. 

 Abdomen of male, x 21. 



long as the first and narrower; the third article is twice as long as the 

 second and is slender; the flagellum is composed of 23 articles and 

 extends to the posterior margin of the first thoracic segment. The 

 second pair of antennte extend to the posterior margin of the third 

 thoracic segment; the flagellum is composed of 18 articles. The eyes 

 are large and composite and are post-laterally situated. 



The first segment of the thorax is nearl}^ twice as long as the fol- 

 lowing segments which are subequal. The epimera ai-e produced 

 laterally in processes which have rounded extremities. They are not 

 separated from the segments. The seventh tho- 

 racic segment is produced backward in a long 

 median process, with truncate extremity, which 

 extends beyond the first al)dominal segment and 

 some distance over the terminal abdominal seg 

 ment. In the female this process is much shorter, 

 l)eing more in the form of a triangular tubercle. 

 The first segment of the abdomen is short and 

 has three suture lines on either side indicating 

 partly coalesced segments. The terminal abdominal segment in the 

 male has the sides converging toward the posterior extremity, which 

 has a shallow quadrangular excavation, with a long median process 

 extending some distance beyond the post-lateral angles of the segment. 

 The fixed, inner branches of the uropoda are veiy large and broad, 

 and surround the posterior part of the abdomen, meeting the pro- 

 duced median process on either side. The outer branches are long 

 and broad, leaf shaped, and extend some distance be- 

 yond the inner branches. In the female, the terminal 

 abdominal segment is triangular, with the apex pro- 

 duced in a very acute point. The branches of the 

 lu-opoda are similar in shape to those of the male, but 

 are not as long or as broad, and the inner branches 

 do not extend to the median point of the terminal 

 segment. The outer branches are but little longer 

 than the inner branches. 



The legs are all similar and amliulatory. 

 A large number of individuals of both sexes was collected in rock 

 pools, Hallets cove, St. Vincent Gulf, Australia, by Edgar J. Brad- 

 ley. The specimens are in the U. S. National Museum, Cat. No. 32217. 



Genus ISOCLADUS Miers. 



Last thoracic segment in the male with a slender median process 

 produced backward. Abdomen composed of two segments. Termi- 

 nal abdominal segment similar in both sexes, without notch. 



Branches of the uropoda in the male are large, In-oad plates. 



jVlaxillipeds with the second, third, and fourth articles of the palp 

 produced into lobes. 



Fig. it. — Zuzara In- 

 tegra. Abdomen 

 and last two tho- 

 racic segments of 



FEMALE. X 2|. 



