rea- 



25 



posterior. Eyes irregulary rounded, black. Superior antenna* scarcely 

 ching beyond the penultimate joint of the peduncle of the interior, flagelluin 

 7 8-articulate. Inferior antennas about l k as long as the bodv, somewhat stron- 

 ger in male than in female. Anterior gnathopoda having the propodosslmrter 

 than the carpus, in female oblong quadrangular, with the palm transversely 



' 



truncated, in male dilated at the tip, with the palm rounded. Posterior 

 gnathopoda in male having the propodos very large, oval, dilated distallv. 

 palm transversely arcuate and defined below by an obtuse projection. Lasl 

 pair of pereiopoda in male with the meral and carpal joints great Iv diluted, 

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

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

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

 part. Telson about as long as it is broad, very slightly emarginated at tin- 

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

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



Remarks. Boeck has identified this species with the (hiixcti* <im- 

 iinirfJJiffi of Pallas and accordingly named the species Orrln^fin <i<innii<n-i-lln.-<. 

 As there, however, are several nearly related species of the present ^-enus. 

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

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

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

 may 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 

 pair of pereiopoda of the same. 



OccuYYence. This is one of our most common Amphipoda, occurring 

 in considerable numbers along the shores of the whole south and west coasl 

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

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

 quite 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 crevices between stones, hiding itself with 

 great dexterity within the muddy deposit when disturbed. 



Dixtrilmt'um. Denmark, the Baltic, Belgium, British Islands, France, 

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

 Madeira (Morelet), Azores (Barrois). 



