SOME NEW ISOPODS OF THE FAMILY GNATHIIM] 

 FROM THE ATLANTIC COAST OF NORTH AMERICA. 



By Harriet Richardson, 

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



In the present paper three new species are described. One is espe- 

 cially interesting, as it is only the second species known of the genus 

 Bathygnathia, the original species having been described from a frag- 

 ment and referred to the genus Anceus. The other two species be- 

 long to the genus Gnathia. The specimens described have recently 

 been returned by Prof. A. E. Verrill to the U. S. National Museum. 



Family GNATHIID^. 



Genus BATHYGNATHIA Dollfus, 1901. 



All seven segments of thorax free; eyes absent; head with a long, 

 prominent rostrum ; first gnathopods of male consisting of five 

 articles; other characters as in the genus Gnathia. 



The type of the genus is Anceus bathybius Beddard. a 



In 1893 Stebbing b suggested that the form described by Beddard 

 would no doubt require to be transferred to a new genus, but that 

 inasmuch as the species was described from a fragment it would be 

 better to wait until more material was obtained. 



In 1901 Dollfus, without additional material, erected for Beddard's 

 species the new genus Bathygnathia. 



BATHYGNATHIA CURVIROSTRIS, new species. 



Body elongate, about four times longer than wide ; surface smooth. 



Head squarish, with the front produced in a long, prominent ros- 

 trum, equal in width to one-third the width of the head, and about 

 two-thirds as long as the head ; lateral margins even and rounded and 



"Challenger Report, Zool., XVII, Pt. 48, Report on the Isopoda (Pt. 2), 1886, 

 pp. 135-137, pi. .win, flgs. 1-7. 

 6 Hist, of Crustacea, 1893, p. 338. 



Proceedings U. S. National Museum, Vol. XXXV— No. 1653. 



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