6 



the cutting edges of the mandibles. Posterior lip with the lobes subpedi- 

 cellated and wide apart. Mandibles rather powerful, with the cutting edge 

 finely denticulated, molar expansion more or less laminar, palp distinct, triarti- 

 culate and naked. First pair of maxillae without any basal lobe, masticatory 

 lobe densely hairy and having a few slender terminal spines, palp lamellar, 

 uniarticulate. Second pair of maxillae with both lobes densely hairy and ter- 

 minating in blunt points. Maxillipeds with the terminal lobes more or less 

 crescent-like. Gnathopoda imperfectly subchelate, os complexly chelate. Pereio- 

 poda generally not very dissimilar, basal joint of the 3 posterior pairs 

 rather narrow. Incubatory lamella? without marginal seta?. Uropoda normal, 

 biramous, rami lanceolate, without spines, but with the edges finely serrated. 

 Telson triangular. 



Remarks. - Besides the 4 genera treated of in the following pages 

 and belonging to the Norwegian fauna, Dr. Bovallius enumerates, in his 

 Systematical list of the Hyperiidea, 5 other exotic genera comprised in the 

 same family, viz., Iiriopi* Bovall., Tcmria Dana, Hyperidla Bo vail., TUcurixtella 

 Bovall., and Plironimopsis Glaus. Of the several characters distinguishing the 

 family, the structure of the antenna? in the 2 sexes may be named as the 

 most easily recognisable one. Moreover the form of the cephalon and the 

 structure of the oral parts, partly also that of the pereiopoda, "afford well 

 marked differences between this and the other Hyperidean families. 



Gen 1. Hyperia, Latreille, 1825. 

 Syn: Lestrigonus, M Edwards = cf. 



Cephalon much more deep than long, somewhat flattened in front, Meso- 

 some greatly inflated in the female, with the back evenly vaulted. Antenna? 

 in female very small, subequal. Mandibles with the molar expansion large 

 and finely fluted transversally, palp of moderate size, with the 2 outer joints 

 subequal in length. First pair of maxilla? with the pal}) not very expanded, 

 inner corner produced to a tooth-like projection. Maxillipeds with the ter- 

 minal lobes obtusely pointed, inner edge with small tufts of hair. Gnathopoda 

 scarcely chelate; carpal joint, however, more or less produced inferiorly, 

 especially in the posterior ones. Pereiopoda comparatively short and robust, 

 sul MM | mil in length. Uropoda rather broad, with the rami foliaceous. Telson 

 comparatively large. 



Rew >/,*. This genus, which may be considered the type of the 

 family, comprises several species occurring in different parts of the Oceans. 

 Dr. liovallius enumerates 10 different species, two of which only belong to 

 the Norwegian fauna. 



