64 Mr. E, J. Miers on Arctic Crustacea. 



Two very distinct varieties of this species are in the collection. ' 



In one, which may be considered the typical, and which is pro- 

 bably also the commonest condition of the species, the body is of a 

 compact, robust form ; the head, and each of the segments of the 

 body, is armed with a pair of conical erect spines, which are smaller 

 upon the posterior segments ; on the terminal segments, in lieu of 

 spines, are two small tuberculiform prominences. The coxae of the 

 last three pairs of legs project laterally, and are acute at the extre- 

 mity. The spines vary considerably in size ; in the largest indivi- 

 dual, a female, obtained by Mr. Hart at Franklin -Pierce Bay, 

 length nearly 2 inches 6 lines (63 millims.), the spines on some of 

 the segments are reduced to little more than prominent tubercles. 

 This specimen bears a thickly clustered brood of young upon the 

 peduncles of the large outer antennae ; in these young individuals 

 scarcely any traces exist of tubercles or spines ; they average 3^ 

 lines in length. 



Var. Feildeni. PI. III. fig. 1. 



Coll. Feilden : Floeberg beach, 82° 27' N. lat., very abundant, 

 males, females, and young ; near winter quarters of H.M.S. ' Alert,' 

 82° 26' 22" N. lat., one specimen. 



In this variety, to which belong the specimens from Floeberg beach, 

 the head and first four segments of the body are smooth, or with 

 only the most obscure indications of tubercles ; on the fifth to seventh 

 segments, and on the first two postabdominal segments is a pair of 

 smaU. tubercles occupying the place of the prominent spines of the 

 preceding variety ; the terminal segment is usually quite smooth ; 

 the coxae of the last three pairs of legs are less prominent and acute 

 than in that which I have considered the typical form of the species. 

 In the young animals (of which a large number were collected), 

 the tubercles on the first four segments are sometimes clearly dis- 

 tinguishable. Adult specimens of both sexes were collected, the 

 males in greater abundance. It is worthy of note, that among all 

 the specimens collected at this locality not one exhibits any approach 

 to the variety from Cape Napoleon. 



This variety cannot, however, be regarded as a distinct species, 

 on account of the tendency to variation in the length of the spines 

 of the preceding form ; there is, moreover, in the collection of the 

 British Museum a specimen from Baffin's Bay, in which the spines 

 upon all the segments are reduced to tubercles. 



This common Arctic species occurs on the northern coast of 

 America (Port Bowen), at Spitzbergen, the Faro Islands, and 

 Iceland. 



Gyge hippolytes. 



Bopyrrjis hippolyteSfKjeojer, Kongl. Dansk. Vidensk. Selsk. Afhandl. vii. 



p. 306, pi. iv. fig. 22 (1838) ; Voy. en Scand. Atlas, Crust, pi. xxviii. 



tig. 2 c? & 2 ; M.-Edw. Hist. Nat. Crust, iii. p. 283 (1840). 

 Gyge hippolytes, Spence Bate and Westwood, Hist. Brit. Sessile-eyed 



Crust, ii. p. 230 (1868) ; Buchholz, in Koldewev, Zweite deutsche 



Nordpolarfahrt, Crust, p. 286 (1874). 



