102 Mr. E. J. Miers on Arctic Crustacea. 



Of sixteen adult, or nearly adult, specimens from Floeberg Beach, 

 which, being preserved in spirit, could be acurately examined, ten 

 are males. Of the six females, all but one carried a number of 

 young animals beneath the lamelliform ciliated plates developed from 

 the inner side of the first five pairs of legs. In the younger animals 

 these plates are present, but much less markedly developed, being 

 slender and substyliform. 



The length of the largest male is 1 inch 4 lines (34 millims.), 

 that of the largest female about 1 inch 2i lines (31 millims.). 

 The hands of the first and second pairs of legs (gnathopoda) are 

 much more powerful in the male than in the female : the palm of 

 the second pair in the female is of a suboblong shape ; in the male 

 it is ovate, and narrowed towards the distal extremity, like that of 

 the first pair of legs. 



This very common species probably occurs upon the coasts of all 

 the circumpolar region of the globe. In Europe its range extends 

 southward to the Mediterranean and the Black Sea. 



Oammaracanthus loricatus. 



Gammarus loricatus, Sabine, Append. Capt. Parrv's 1st Voy. p. 53, pi. i. 



fig. 7 (1821) ; Boss, Append. Capt. Parry's 3rcl Voy. p. 118 (182G) ; 



Append. Parry's 4tli Voy. p. 204 (1828) ; Ross & Owen, Crust, in 



Append. Koss's 2nd Voy. p. Ixxxix (1835) ; Kroyer, Kongl. Dansk. 



Vid. Selsk. vii. p. 250, pi. i. fig. 4 (1838) ; M.-Edw. Hist. Nat. 



Crust, iii. p. 52 (1840) ; Bell in Belcher's ' Last of the Arctic 



Voyages,' Crust, p. 405 (1855). 

 Gammaracanthus loricatus, Spence Bate, Oat. Amphip. Crust. Brit. 



Mus. p. 202, pi. xxxvi. fig. 2 (1862) ; Boeck, Skandinav. og Arktiske 



Ampbipoder, ii. p. 400 (1876). 



Coll. Eeilden : Floeberg Beach, at 10 fathoms, two males and 

 two females. 



The two males collected are much smaller than the females. 

 Length of largest male nearly 1 inch 6 lines (38 millims.), of 

 largest female about 1 inch 11 lines (49 miUims.). 



Gammaracanthus loricatus is found upon the shores of Arctic 

 America (Port Bowen, Prince Regent's Inlet) and Scandinavia ; 

 also in lakes of the latter-mentioned region and of Finland, and 

 at Greenland and Spitzbergen and in the White Sea. 



Amatliilla pinguis. 



Gammarus pinguis, Ki'oyer, Kongl. Dansk. Vidensk. Selsk. vii. p. 252, 



pi. i. fig. 5 (1838); M.-Edw. Hist. Nat. Crust, iii. p. 50 (1840). 

 Amathia pinguis, Spence Bate, Cat. Amphip. Crust. Brit. Mus. p. 200 



(1862). 

 Amathilla pinffuis, Boeck, Vidensk. Selsk. Forhandl. p. 218 (1870) ; 



Skandinav. og Arktiske Amphip. ii. p. 411 (1876) ; Buchholz, Crust. 



in Koldewey, Zweite deutsche Nordpolarf. p. 353, pi. ix. fig. 2 



(1874). 



Coll. Feilden : Crack between floes at lat. 82° 24', one specimen. 

 The single specimen collected has been dried, and is in an ira- 



