451 



Gen. 5. Pontogeneia, Boeck, 1870. 



Body comparatively slender, with none of the segments produced 

 dorsally. Cephalon of moderate size, with a very short rostral projection, and 

 the postantennal corners somewhat produced. Coxal plates comparatively 

 small, 4th pair the largest, and distinctly emarginated posteriorly in their 

 upper part. Antennae slender and elongated, the superior ones being some- 

 what shorter than the inferior, and without any accessory appendage. Antennae 

 in male much more elongated than in female, and having the opposite edges 

 of the peduncles clothed with large calceolee. Oral parts nearly as in the 

 genus Calliopius, except that the basal part of the maxillipeds appears some- 

 what larger and more laminar. Gnathopoda subequal, and of very feeble 

 structure, the carpus being considerably prolonged, and scarcely expanded 

 below, propodos rather narrow, with the palm shorter than the hind margin. 

 Pereiopoda of the usual appearance, basal joint of the 3 posterior pairs rather 

 expanded. Last pair of uropoda with the basal part quite short, rami sube- 

 qual and lanceolate in form. Telson unarmed and deeply cleft. 



Eemarks. The present genus, established by Boeck, is nearly allied 

 to the 3 preceding ones, differing however, very materially in the structure 

 of the telson, which, unlike what is generally the case in the present family, 

 is not entire, but deeply cleft. In the feeble structure of the gnathopoda, it 

 somewhat resembles the genera Halirayes and Aplicrum. It comprises as yet 

 only a single species, to be described below. 



10. Pontogeneia inermis (Kreyer). 



(PI. 159). 



AmpltithoiJ inermis, Kroyer, Gr0nlands Amphipoder. Danske Vid.-Selsk. Afhandl. VII, p. '276, 



PI. 3, fig. 11. 



Syn. : Ainphithoe crenulata, Kroyer (male). 

 > Atylus inermis, Sp. Bate. 

 crenulatus, Sp. Bate. 



Pararnphithoe' inermis, Goes. 



Body rather slender and compressed, wiht the back evenly rounded 

 throughout. Cephalon about the length of the first 2 segments of mesosome 

 combined, rostral projection very small, lateral corners short and obtusely 

 rounded, being defined posteriorly by an angular incision, postantennal corners 



