SOME NEW ISOPODA OF THE SUPERFAMILY ASEL- 

 LOIDEA FROM THE ATLANTIC COAST OF NORTH 

 AMERICA. 



By Harriet Richardson, 

 Collaborator, Division of Marine Invertebrates, U. 8. National Museum. 



In the U. S. Bureau of Fisheries collection recently received by the 

 U. S. National Museum from Prof. A. E. Verrill, Yale University 

 Museum, are a number of new and interesting forms belonging to 

 the superfamily Aselloidea. Several new genera belong to the fami- 

 lies, Janiridse and Desmosomidae, and also a new species of Eurycope, 

 are herein described. 



Family JANIRIDiE. 

 Genus IOLELLA Richardson, 1905. 



IOLELLA GLABRA, new species. 



Body oblong-ovate, about twice as long as wide; surface of body 

 without spines or tubercles. 



Head much wider than long with the front produced in the middle 

 in a long rostrum, which is about as long as the length of the head; 

 the antero-lateral angles are also produced in acute, triangular pro- 

 cesses, which are about half as long as the rostrum. The eyes are 

 small, round, composite, and are placed halfway between the lateral 

 margin and the median longitudinal line and halfway between the 

 anterior and posterior margins of the head. The first pair of an- 

 tenna? have the first two articles of the peduncle about equal in 

 length; the third article is about half as long as the second; the 

 flagellum, which consists of twenty-four articles, extends a little 

 beyond the fifth article of the peduncle of the second pair of an- 

 tennae. The second pair of antennae have the first two articles of 

 the peduncle very short; the third article is equal in length to the 

 first two taken together, and is furnished on the exterior margin 

 with an antennal scale ; the fourth article is also short ; the fifth and 

 sixth articles are elongate and are about equal in length ; the flagellum 

 is long and is composed of nearly one hundred articles. 



Proceedings U.S. National Museum , Vol. XXXV— No. 1633. 



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