GAMMAUID.E. 66 



two anU'riiH" pairs of pcreiopoda deeper than their respective seg- 

 ments of the pereion ; those of the second pair of pereiopoda pro- 

 duced inferiorly and posteriorly. Coxa) of the fourth pair nmch 

 shorter than the third. Pereiopoda snbequal. Posterior pair of 

 pleopotla double-branched. Telson single, squaniiforai, cntii'c. 



1. Lysianassa nugax, (Platk X. fig. 3.) B,M. 



Cancer nugax, Phipps, Vai/. mi Pole Boreale, p. 192. pi. 12. f. 3. 

 Talitrus inigax, Ross, Parry's TJiwd Voi/fu/e,n. 119, and Polar Voyage, 



p. 205. 

 Gauinianis nugax, Sabine, Siipp, to Parry''s First Voynyo, p. ccxxix. 

 Owen, Siipp. to Ross's Second Voyage in Search of a N. W. Passage, 

 p. Ixxxvii. 

 Lysiauassa l)identicidata, Spe?ice Bate, Ann. N. H. May 1858, p. 302. 

 Anouyx iicvigatus, Stimj)soH, 3IS. 



Eyes ovate, light brown, Superior antennae short. Inferior an- 

 tenna) not longer than the superior. EpLstome rounded in front, 

 projecting, wedge-shaped. Maxillipeds 'ha\'ing a long dactylos; 

 squamiform processes marked with radiating strioD. First pair of 

 gnathopoda ha\'ing the carpus short, the propodos long, the dac- 

 tylos short and slightly bent. Second pair of gnathopoda with the 

 caii)us long, propodos very short, palm advanced. Meros, carpus, 

 and propodos tufted with short hairs and fasciculi of long haii'S. 

 The third segment of the pleon having a short obtuse tooth near 

 the middle of the posterior margin and another at the inferior angle. 

 Posterior pair of pleopoda having the rami not longer than the 

 basal articulation. Telson slightly cleft. 



Length li inch. 



Hab. Arctic Ocean {Sti)yipson, Ross, Phiiyps, ^'c). 



The drawing from which the figure is taken was made fi'om a 

 specimen in the lloj-al College of Surgeons ; it is spHt in two 

 halves, and consequently had already been examined ; it is probably 

 the original of the one desciibed in ' Ross's Voyage.' 



I have also compared it with Anonyx l(evi<jatas of Stimpson, a 

 specimen having been sent to me by my vahied correspondent the 

 industrious Zoologist of the United States' Exi>edition to Japan. I 

 am therefore enabled to identify them. 



2. Lysianassa Kroyeri. (Plate X. fig. 4.) l^.M. 



Epliippiphora Kriiyori, Wliitc, Ann. ^- il/c/c/. Nat. Hist. ser. 2. vol, L 

 p. -l-li), 1848, ancl Zool. Erebus ^- Terror', pi. 5. 



Animal not much compressed, smoothly arcuate ; a dorsal sinus in the 

 fourth segment of the plcon. Eyes rcniform. Supci-ior antennaj 

 having the first joint of the peduncle reaching scarcely beyond the 

 ocular process of the cephalon, th-e sccojid and third joints very 



y 



