6 



the cutting edges of the mandibles. Posterior li]i with the lol)es snh])edi- 

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

 finely denticvilated, molar expansion nn)ie or less laminar, palp distinct, triarti- 

 culiite and naked. First pair of maxilla; without any basal lobe, masticatory 

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

 uniarticnlate. Second pair of maxilla? with both lobes densely hairy and ter- 

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

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

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

 rather narrow. Incubatory lamellae withoiit marginal setae. Uropoda normal, 

 biranious, rami lanceolate, without s])inps, but with the edges finely serrated. 

 Telson triangular. 



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

 and l)elonging to the Norwegian fauna. Dr. Bovallius enumerates, in his 

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

 same family, viz., IiiJopis Bovall., Taiiria Dana, Hypi'viclla Bo vail., TliewiittcUa 

 Bovall., and Ph.roniiiiopsif< Claus. Of the several characters distinguishing the 

 family, the structure of the antennse in the 2 sexes may Ije named as the 

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

 structure of the oral jiarts, jiartly also that of the pereiopoda, afford well 

 marked differences between this and tlie other Hyperidean families. 



Gen 1. Hyperia, LatreiUe, 1825. 

 Syn: Lestrii/imus, M — Edwards = cf. 



Cephalon much more deeji than Imig, somewhat flattened in front. Meso- 

 some greatly inflated in the female, witli the back evenly vaulted. Antennae 

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

 and finely fluted transversally, jialji of moderate size, witli the 2 outer joints 

 subequal in length. First pair of maxillae with the ])alp not very expanded, 

 inner corner produced to a tooth-like projection. Maxilli]ieds with the ter- 

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

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

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

 subeijual in length. Uro])oda rather broad, with the rami foliaeeous. Telson 

 comjiaratively large. 



Mamarlcs. — This genus, which may be considered the ty])e of the 

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

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

 the Norwegian fauna. 



