25 



pDstcriiir. Eyes iii'egulary roundiMl, lilaek. >Superi(ir anteiiiiU:' scarcely rea- 

 eliiiig Ijeynnd the penultimate joint of the peduncle of the inferior, flagellum 

 7 — 8-articulate. Inferior antennre aliout Vs as long as the body, somewhat stron- 

 ger in male than in female. Anterior gnathopoda having the propodos shorter 

 than the carpus, in female oblong q^iadrangular, with the palm transversely 

 ti-uneated, in male dilated at the tip, with the palm rounded. Posterior 

 gnathopoda in male having the propodos very large, oval, dilated distally, 

 palm transversel}- arcuate and defined below by an obtuse projection. La.st 

 pair of pereiopoda in male with the meral and carpal joints greatly dilated, 

 the former triangular, the latter rounded quadrangular. Pleopoda with the 

 basal part much longer than the rami and quite bare. Last pair of uropoda 

 witli the ramus very small and narrow, scarcely half as long as the basal 

 part. Telson about as long as it is lu-oad, very slightly emarginated at the 

 tip. Colour of female uniform greenish, of male yellowish with In-own trans- 

 versal bands. Length of female 15 mm., of male 17 mm. 



Renmrhs. — Boeck has identified this species witli tlie (h)isrH.9 f/nm- 

 m<iy<llus of Pallas and accordingly named the species Orchrsiin (faiiniKirflliis. 

 As tliere, however, are several nearly related species of the present genus, 

 and it is impossible from the imperfect description and figure given by Pallas 

 to decide with certainty, what species he has observed, I think it will be 

 liest to retain the specific name proposed by Montagu. The present species 

 ma}- be best known from the related forms by the structure of the posterior 

 gnathopoda in the male, partly also by the peculiar development of the last 

 ]iair of pereiopoda of the same. 



Occnrrencp. — This is one of our most common Amphipoda, occurring 

 in considerable niimbers along the shores of the whole south and west coast 

 of Norway, at least up to tlie Trondhjemsfjord. It is met with, as the 

 Talitri, beneath old sea-weed at high water mark, aiul moves about in a 

 ([uite similar hopping manner. While, however, the Talitri seem to be 

 confined to sandy beaches, this form may very often also be collected on 

 the rocky shores, and in the crevice.s between stones, hiding itself with 

 great dexterity within the muddy deposit when disturbed. 



Bisfrihnfioii. — Denmark, the Baltic, Belgium, British Islands, France, 

 Mediterranean, the Black Sea (Czerniavsky), coast of Algiers (Chevreux), 

 Madeira (^Morelet), Azores (Barrois). 



