466 



BULLETIN 54, UNTTED STATES NATIONAL MUSEUM. 



Fig. 521.— Iolella 

 holmesi. x 7. 



is large, dilated; the two following- joints are slender; the flagellum 



consists of twenty joints. The second pair of antenna? are longer 



than the bod}. The first four joints are short, with an articulated 



exopod on the third joint; the fifth and sixth joints are ver}^ long, 

 the fifth being slightly longer than the sixth; the 

 tlagellum consists of numerous joints. 



The posterior portion of the lateral margin of the 

 first segment of the thorax is produced on either side 

 in a triangular process; the epimeron is situated at the 

 anterior portion of the lateral margin and is produced 

 in a triangular process about as long as the posterior 

 one. The anterior as well as the posterior lateral 

 angles of the second and third segments are each pro- 

 duced in a long process, with the bifurcate epimeron 

 situated between. The anterior portion only of the 

 lateral margin of the fourth segment is produced with 

 the bifurcate epimeron situated at the posterior portion 

 of the segment. The fifth, sixth, and seventh segments 

 have the anterior portion of the lateral margin pro- 

 duced in a process which extends outward and down- 

 ward and in the last segment is triangularly produced 



at the posterior extremity, the epimeron in each segment occupying 



the posterior portion of the segment. 



The abdomen is composed of a single segment, the posterior margin of 



w^hich has a widely rounded median expansion with an acutely pointed 



lateral expansion on either side. The uropoda 



are about equal to the abdomen in length; the 



outer branch is slightly shorter than the iiuier 



one; the basal joint is equal in length to the 



outer branch. 



The legs are all furnished with bi-unguiculate 



dactyli. The first pair are prehensile, the carpus 



being very large and armed with spines along 



the inner margin; the propodus is serrulate along 



the inner margin at the proximal end. 



Two specimens, both females, were taken by 



the U. S. Bureau of Fisheries steamer Alhatross 



at station 4253, Stephens Passage, southeastern 



Alaska, and station 4228, vicinity of Naha Bay, 



Behm Canal, southeastern Alaska. Depth, 41 to ISS fathoms. Type 



in the U. S. National Museum, Cat. No. 29249. 



This species is named for Dr. Samuel J. Holmes, who has done much 



work on the Crustacea of the Pacific coast. 



Fk;. .522.— IoLELI-A HOLMESI. 



First leg of female, x 

 201. 



