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



Cape Fraser, 20 fathoms, three young females (?) ; Dobbin Bay, at 

 30 fathoms, one female. 



About fifty specimens in all were collected of this species, of 

 which only six are males. The length of the largest male is 1 inch 

 5 lines (36 millims.), that of the largest female, a specimen bearing 

 ova, nearly 1 inch 9 lines (44 millims.). 



None of the females in the collection carry any young animals; 

 !)ut the greater number have ova in a greater or less degree of deve- 

 lopment. In the youngest females in the collection, from Cape 

 Napoleon, length 1 inch \ line, in which no ova are present, the 

 ovigerous lamellae are small, much smaller than the branchial 

 leaflets, but they are rapidly developed, and become ciliated as the 

 animal increases in age ; in the largest females, with fully ripened 

 ova, they considerably exceed the branchial lamellae in size, and com- 

 pletely infold and conceal the ova. These latter at first present the 

 appearance of a whitish mass scarcely a line in length, but when 

 ripe are of a reddish- or orange-yellow colour, and completely fill 

 the cavity beneath the pereional segments. 



This species is one of the commonest of the Amphipoda inhabiting 

 the northern seas. It has been found, often in great abundance, 

 on the shores of Arctic America (Port Bowen, Igloolik), Greenland, 

 Spitzbergen, Finmark, and in the White Sea. 



j^gina spinosissima. 



^ffina spinosissima, Stimpson, Syn. Invert. Grand Manan, p. 44 (1853). 

 Caprellu spinifera, Bell, in Belcher's ' Last of the Arctic Voyages,' ii. 



p. 407, pi.' XXXV. fig. 2 (1855) ; Buchholz, Crust, in Koldewey, 



Zweite deutsche Nordpolarf. p. 338 (1874). 

 ? JEgina echinata, Boeck, Fork. Skand. Nat. p. 670 (1860) ; Vidensk. 



Selsk. Fork. p. 271 (1870) ; Skand. og Arktiske Amphip. ii. p. 680, 



pi. xxxviii. fig. 6 (1876). 

 Caprella spinosissima, Spence Bate, Cat. Amphip. Crust. Brit. Mus. 



p. 361, pi. Ivii. fig. 3 (1862). 



Coll. Feilden : Cape Napoleon, 25 fathoms, temperature of water 

 29°'2, one small male specimen. 



Coll. Hart : Dobbin Bay, 30 fathoms, one large male specimen. 



The largest specimen, length nearly 2 inches 2 lines (54 miUims.), 

 is very robust, of a green colour, and with but very few small 

 spines and many indistinct very smaU tubercles ; the second pair 

 of legs has the hand armed upon its inferior margin with two very 

 strong teeth, and a third small tooth close to the distal extremity ; 

 the finger is strong and very much curved ; the first joint of the 

 first pair of postabdominal appendages is short and much broader 

 than the second joint. 



The smaller specimen, length a little over 11 lines (24 millims.), 

 is of a whitish colour, purplish brown at the bases of the spines, 

 which are numerous, especially on the back. The hand of the 

 second pair of legs is nearly of the same form as in the preceding, 

 but the finger is less arcuate ; the basal joint of the second pair of 

 legs not broader than the second joint. 



