UAMJ1AKI1),E. 213 



tliopuda (.lifter from the tii-st in having the propodos larger, and the 

 palm less oblique and straight. 

 Length i-^ths of an inch. 



Hab. Jamaica {Lieut. Redman). 



1 I. GammarusBoreus. (Plate XXXVII. fig. 10.) B.M. 



Gamniarus Boreas. Subine. Siippl. to Purri/'s First Voyage, p. ccxxix. 



Roxs, App. to Parry's T/iircl Voyaye, p. 119 ; Polar Voyaye, p. 204 ; 

 Second Voi/aqe, Siippl. p. 88. 



Wltite, Cat. Crust, B. M. 1847. 



Hell, App. to Belcher's Arctic Expcd. p. 405. 



Ou-en. Nat. Hi.st. Cat. Boy. Coll. Surg. MS., opposite p. 93. 

 Gamniarus Pulex, Deqcer, Ins. vii. p. 525. pi. 33. tigs. 1, 2. 

 Gammarus glacialis, Leach, MS., White, Cat. Crust. B. M. 1847. 

 Gammavus Arcticus^ Leach, MS., Wliite, Cat. Crust. B. 31. 1847. 



This species closely resembles Oammarus ornatus, from which it 

 appears to differ only in some minnte details of the gnathopoda. 

 The fii'st pair have the propodos ovate, palm oblique. The second 

 pair have the propodos broader ; palm unarmed, furnished with a 

 few cilia, less oblique, imperfectly defined by three short blunt 

 spines ; marginate, margiuation parallel with the palm, except 

 near the base of the dactylos, whore it is lobed, closely lined with 

 vertical stria3. 



Length 1 inch. A specimen in the Museum of the Royal College of 

 Surgeons is 1^-^j inch long. 



Hah. Spitzbergen. Presented to the British Museum by the 

 Admii-alty. Baffin's Bay. " It is abundant along the shores of 

 the north-east part of the American continent and its contiguous 

 islands, but especially near the estuaiies of rivers, seeming to prefer 

 brackish to the salt water of the ocean." — Moss. 



15. Gammarus Sundevallii. (Pl.4te XXXVIII. fig. 1.) 



Gammarus .Suude\allii, Ratltke, Beitriiqe zur Fauna Norte, in Nor. Act. 

 Leop. 1843, p. 65. t. 3. f. 2. 



Li/Jrbory, Ofrers. af Konyl. Vet. Akad. Forhandl. 1854, p. 454. 

 Bruzelius, Skand. A)nph. Gainm. p. 57. 



" Male. — Cephalon without a rostrum. Spines on the fourth and 

 fifth .segments of the pleon. Eyes round. Inferior antenna) 

 longer than the .superior ; first joint of the peduncle possessing a 

 short aciite process*. Second pair of gnathopoda larger than the 

 first, oblong-ovate, pilose. Ultimate pair of pleopoda reaching 

 beyond the penultimate ; rami nearly equal, flattened, lanceolate. 

 Telson double, subovate, posteriorly spinose." — Raihke. 



" Female. — Differs from the male in having the gnathopoda nearly 



» Olfactory organ ?— C. 5. B. 



