15 



sjieciinen.s 1;') iiiiii. Maximum leugtli of arctic .specimens, according- to Boeelv 

 25 mm. 



EcmarJ<>-. — In some characteristics, e. g., in the carinated back and 

 tlie stiucture of tlie antennae, this species shows a ])erplexing resemblance to 

 E. conq))rss((' (Goes), and on this account the two species would seem to have 

 lieen confounded botli by Boeck and Bovallius. On closer examination, the 

 present species is, however, easily distinguislied by the exceedingly elongate 

 and slender form of the 3rd jiair of ]>ereiopoda, and more especially l)y the 

 l)eculiai' armature of the propodal joint of these legs. It may be observed 

 that this character is also quite distinct in very young specimens, whei'eas 

 in these the dorsal processes are very inconsjjicuous or nearly quite oljsolete. 



Occurrence. — Of this form I have taken a few adult and several 

 \dung specimens at Sorvser and Hasvig in west Finmark, together with 

 E. coDtjires&xi and F(i,r(Ulu"mido oblivia. 



Distrihiifioii. — Arctic Ocean: Greenland, Spitsbergen (?); off Nova 

 Scotia (Stel)bing). 



Fam. 2. Lycaeidae. 



Cephalon large, svtbglobular, canaliculated interiorly. Eyes enormous, 

 occupying the entire lateral walls of the head. Antennae originating from the 

 inferior side of the cephalon, very dissimilar; 1st pair rather small, with short 

 uniarticulated y)eduncle (in female), flagellnm rather dis.similar in tlie two sexes; 

 2nd ]iair imperfectly developed in female, very large in male and tohlcd u|i 

 Ijeneath the cephalon. Oral parts more or less imperfectly develo]ied. (linatho- 

 poda simple, or complexly subchelate. The 3 posterior pair of pereio])oda 

 with the" basal joint more or less expanded, last pair generally very small. 

 Incubatory lamella? without marginal setae. Pleopoda very powerful. Uro|)oda 

 normal. Telson triangular. 



Remarks. — This family is synonymous with the family Tryphnnidn- 

 of Boeck and Bovallius. I have, however, seen tit to change the name, 

 l)ecause, according to the rules of Zoology, the denomination of a family 

 <iught to be derived from the geniis fir.st established, and as the genus Lycwa 

 of Dana undoubtedly belong to the same family as the genus Triii>hiiui\ of 

 Boec^k, the family must of course be imined after the foi'mer genus, which 

 is by far the older one. According to the restrictions of Dr. Bovallius, the 

 familv comtii'ises, besides the 2 above mentioned genera, 5 others, viz.. 



