MARINE ISOPODA OF NEW ENGLAND, ETC. 



Specimens examined. 



387 



Syscenua* gen. nov. 



Eyes wanting; palpus of inaxillipeds two-jointed; sixth and seventh 

 pairs of legs elongated; pleou suddenly narrower than the thorax; 

 pleopods naked. 



This genus is unfortunately represented in the collection by a single 

 specimen. It differs from JEya by characters that point toward the 

 Cymothoidatj as in the reduction of the segments of the palpus of the 

 maxillipeds, the sudden constriction at the base of the pleon, and the 

 11:1 Iced pleopods. The absence of eyes, although a conspicuous charac- 

 ter can hardly be regarded as of great taxonomic value. It is separated 

 from the OymotJioidce by the form of the head, which is not produced 

 over the bases of the anteimulco but merely projects slightly between 

 them. The autcimuLe moreover are composed of three peduncular seg- 

 ments and a ilagellum; the basal segments are much smaller than in 

 ^Eya and less flattened, but still form a part of the anterior outline 

 \vhen seen vertically. The last lour pairs of legs differ from the first 

 three, and are more or less elongated and fitted for crawling. The 

 iiropods are distinctly ciliated. 



Syscenus infelix up. nov. 



This species may bo recognized among our Isopoda by the possession 

 of the full number of segments, the ciliated uropods, naked pleopods, 

 and the absence of eyes. 



a messmate. 



