12 



bent ill iii^aiiist tlie former. Third pair of pereiopoda greatly produced and 

 generally imicli longer than the 2 succeeding pairs, having the carpal and 

 propodal joints veiy elongated and the hitter often peculiarly denticulated, 

 whereas the meral joint is mnch aVibreviated. Uropoda ratiier slender. Telson 

 .small, triangular. 



JlcmarJc.'t. — As mentioned above, this genus is very nearU* related 

 to the preceding one, scarcely diflering except in tlie mutual longitudinal 

 relation of tlie pereiopoda and in the powerful struotui-e of the 2 anterior jiairs. 

 The usual known generic denomination, Tlicmisfo, has been changed by 

 Hr. Bovallius to E/ithciiiisfo, because the former name was employed in 

 Zoology anterior to 1.S2S. The genus is represented both in the antarctic 

 and arctic Oceans. Dr. Bovallius enumerates 6 species, one of which, however 

 7?. NonJrii.sl'joJdi Bovall., has been withdrawn by Dr. Hansen as most ])robably 

 only founded on immature sjiecimens of TJ. lihtlhila. (Maiidt). No less than 'i 

 different sjiecies belong to the Norwegian fauna. 



5. Euthemisto compressa, ((tocs). 



(PI. 5, lig. •>.). 

 Tliciiiisto comprrss/i , Goes, 0fvers. af Kgl. Svenska Vetensk. Akad. forliandl 1865, 



p. 633, pi. 41, lig 34. 

 Syn ; ? Entliniiisto hisjnnosn, Bovall., not Boeok. 



Body moderately slender and highly compressed, back distinctly 

 carinated and forming on the ])osterior segments of the mesosome and the 

 anterior ones of the metasome sharp recurved jiroeesses. Cephalon, as seen 

 laterally, rounded triangular, more deep than long; eye-pigment of moderate size, 

 oval. Superior antennae in female about the length of the cephalon, Hagellum 

 strongly curved and denticulated on the posterior edge. Posterior gnathojioda 

 with the carpal process almost reaching the tij) of the projiodal joint, dactylus 

 scarcel\' more than liall' the length of the latter joint. Carpal joint of tlie 

 2 anterior pairs of pereiopoda regularly oval, broadest in the middle, witii 

 rather short and une(jual bristles on the posterior edge. Third pair of pereio- 

 poda only slightly exceeding in length the 2 .succeding ones, basal joint not 

 expanded, propodal joint veiy slender and about the length of the 3 preceding 

 joints combined, anterior edge very minutely denticulated throughout and 

 provided at regular intervals with about 10 slender bristles; daet^-lus rather 

 elongate, unarmed. Posterior pair of uropoda nearly twice tlie length of the 

 urosome, outer ramus much shorter tlian inner. Body pellucid, with dark 

 intestine and scattered purplish pigmentary spots on the jiosterior division 

 of the body. Usual length 12 mm. Maximum length (d' arctic sjjecimens. 

 according to Bovallius. ?>i) mm. (?). 



