86 



35. Euryporeia gryllus, (Mandt). 



(PI. 39.) 



Lysiannsm gryllns, Mandt, Observationes in historiam naturalem in itinere Groenlandico faetre 



1822. p. 34. 



Syn: Lysianassa magellanica, M. JM\v. 



Body rather thickset and strongly built, with broadly rounded back 

 and the segments very sharply demarcated. Cephalon shorter than the 1st 

 segment of mesosome, rather tumid, nearly globular, lateral corners very small 

 and narrowly, rounded. First pair of coxal plates extremely small, rounded, 

 leaving the lateral faces of the cephalon uncovered; the 3 succeeding pairs 

 successively increasing in size ; 4th pair a little deeper than the body, rather 

 expanded below and angularly produced posteriorly; 5th pair nearly twice as 

 broad as deep. Last segment of metasome provided with a very conspicuous 

 dorsal indentation at some distance from the base, epimeral plates rounded at 

 the infero-lateral corners. First segment of urosome with a similar dorsal in- 

 dentation as in the preceding segment. Eyes irregularly lageniform, being con- 

 stricted at the middle and having the inferior part expanded to two diverging 

 lobes ; pigment light orange-coloured. Superior antennae about twice the length 

 of the cephalon, 1st joint of the peduncle somewhat longer than the other 2 

 combined; flagellum nearly three times as long as the peduncle and composed 

 of about 30 articulations, the 1st of which is very large ; accessory appendage 

 about half the length of the flagellum and 10-articulate, 1st joint the largest. 

 Inferior antennae nearly twice the length of the superior, last joint of the 

 peduncle longer than the preceding one; flagellum very slender, densely setous 

 on the posterior edge and composed of about 50 articulations. Anterior gnatho- 

 poda with the propodos longer than the carpus, palmar edge somewhat oblique 

 and denned below by a well marked angle. Posterior gnathopoda fully twice 

 the length of the anterior; propodos somewhat shorter and much narrower 

 than the carpus, both densely setous. Pereiopoda with numerous tufts of small 

 setae on the edges; basal joint of 3rd pair very broad, nearly elliptical in 

 form, that of the 2 posterior pairs more regularly oval; meral joint in both 

 these and the 3rd pair very large and expanded, terminating posteriorly with a 

 pointed deflexed lobe. Last pair of uropoda with the inner ramus somewhat shorter 

 than the outer, terminal joint of the latter very small, aculeiform. Telson 

 nearly extending to the tip of the last pair of uropoda, conico-acuminate in 

 form, and without any denticles, cleft extending far beyond the middle, very 

 narrow, fissure-like. Colour 1 rosy with a yellowish tinge, edges of the 



1 According to the statements of Dr. E. Chevrenx. 



