451 



Gen. 5. Pontogeneia, Boeck, 1870. 



Body rompai'atively slender, with none of the segments produced 

 dorsally. Ceplialon of moderate size, with a very short rostral pi'ojection, and 

 the postantennal corners somewhat produced. Coxal plates comparatively 

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

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

 what shorter than tlie 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 calceolse. Oral parts nearly as in the 

 genus CaUiopiiis, except that the basal part of tiie raaxillipeds 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. 



Remarks. — 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, biit deeply cleft. In the feeble structure of the gnatliopoda, it 

 somewhat resembles the genera Halirages and Aplierusa. It comprise.? as yet 

 only a single species, to be described below. 



10. Pontogeneia inermis (Kreyer). 



(PI. 159). 



AmphUhoa inermis, Kro.ver, Gr0nlanfls Ainpliipoder. Dansko Vid.-Selsk. Afliandl. VII, p. 276, 



PI. 3, fig. 11. 



Syn. : Amphithoe cremilata, Kroyer (male). 



> Atylus inermis, Sp. Bate. 



» — crenulatus, Sp. Bate. 



» Parampliithoi; inermis, Goes. 



Body rather slender and compressed, vi^iht the back evenly rounded 

 tliroughout. Cephalnn about the length of the first 2 segments of mesosome 

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

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



