515 



pairs subcheliform. Pereiopoda moderately slender, the 3 posterior pairs 

 successively increasing in length, basal joint of last pair much larger than 

 that of the preceding pairs. Last pair of uropoda extremely elongated, with 

 the outer ramus of quite an unusual size, being divided into 2 distinctly 

 denned laminar joints. Telson deeply cleft. 



Remarks. - This genus was established in the year 1862 by Bruzelius, 

 to include a peculiar deep-water Amphipod detected by him off the coast of 

 Bohuslan. As, however, the generic name he proposed, Eriopis, was already appro- 

 priated in Zoology, Mr. Stebbing has recently made the above slight change, 

 namely, of adding an . Boeck did not acknowledge the genus, but referred the 

 form described by Bruzelius to the genus Nipliargus of Schedte. True, it comes 

 very near to that genus, but in some particulars it differs rather markedly, for 

 instance, in the very unequal development of the gnathopoda, in the likewise 

 unequal posterior pairs of pereiopoda, and in the peculiar structure of the 

 last pair of uropoda. The genus comprises as yet but a single species, 

 to be described below. 



18. Eriopisa elongata, (Bruzel.). 



(PI. 181, fig. 2). 



Eriopis elongata, Bruzelius, Skand. Amph. Gam. p. 65, fig. 12. 

 Syn : Niphargus elongatus, Boeck. 



Body extremely slender and elongated, with the back evenly rounded 

 throughout. Cephalon shorter than the first 2 segments of mesosome 

 combined, lateral corners rather projecting and evenly rounded, having below 

 them a dentiform projection, defined from the former by a narrow incision. 

 Coxal plates scarcely more than half as deep as the corresponding segments; 

 1st pair angularly produced in front, the 3 succeeding pairs fully twice as 

 broad as they are deep; 4th pair scarcely larger than the 5th, and of a 

 similar shape. Last pair of^ epimeral plates of metasome produced at- the 

 lateral corners to a short dentiform projection. Eyes wholly absent, not 

 even the slightest trace of pigment being visible in the living animal. 

 Superior antennae very much elongated; attaining the length of the whole body, 

 1st joint of the peduncle about the length of the 2nd, but considerably thicker, 

 and armed at the end posteriorly with a slender spine, 3rd joint small, 

 scarcely exceeding V-t of the length of the 2nd, flagellum nearly 3 times as 

 long as the peduncle, and composed of about 32 articulations, accessory 

 appendage extremely small, and biarticulate. Inferior antennae scarcely 



