102 Proceedings of the Biological Society of Washington. 



angle at level of lower edge of eye; broadly margined on each side up to 

 level of eye, the margining sulcus above typically bending in caudad of 

 dorsad; surface under the lens showing very fine punctae, extended in weak, 

 fine and very short lines in part. Sculputuring of other segments typical, 

 the striations below and across prozonites being as usual. Segmental 

 suture in the encircling furrow of each segment; pore at anterior edge of 

 furrow, the suture bending toward it, often angularly. Anal valves ex- 

 ceeding the last tergite, strongly convex, evenly rounded, the mesial borders 

 depressed, not at all set off. First two pairs of legs of male crassate, the 

 claws large as usual, those of succeeding pairs decreasing to the eighth, 

 those of legs following the gonopods smaller. Coxae of legs from third to 

 eighth with th' usal conical processes, these strongly compressed in the 

 anterocaudal direction excepting those of the third pair, these being 

 somewhat thicker and having their apices depressed or flattened. First 

 two pairs of legs in female also more or less thickened with claws long. 



Number of segments, thirty-nine to forty-two. 



Length, to 50 mm. ; thickness, to 6 mm. 



Types in the Collections of the U. S. National Museum. 



