520 



of the peduncle a little shorter than the penultimate one, flagellum scarcely 

 as long as the former joint. Anterior gnathopoda of a structure similar to that 

 in the preceding species, except that the palm of the propodos is somewhat 

 less oblique. Posterior gnathopoda rather powerful, especially in the male, 

 and setous on both edges, propodos ver\- large, and oblong quadrangular in 

 form, palm nearly transverse and defined below by a dentiform pi'ojeetion, 

 inside which is attached a very slender spine, its edge divided into several 

 serrations having between them small spines, dactylus strong and, as in the 

 preceding pair, setous on the oiiter edge. Pereiopoda slender and elongated, 

 the 3 posterior pairs, as usiial, stronger than the 2 anterior, and having the 

 basal joint very narrow. Last pair of uropoda fully as long as the nrosome, 

 rami narrow, sublinear in form, and edged with slender spines, the outer 

 being a little longer than the inner, tip of both rami suljtruncate, and armed 

 with a dense fascicle of spines. Telson comparatively small, scarcely 

 extending to the end of the basal part of the last pair of uropoda, lateral 

 lobes conical in form, and each having a spine inside the tip, and a small 

 bristle outside the same. Colour in the living state of the animal not yet 

 stated. Length of adult male reaching 25 mm. 



Memarlcs. — The present species, detected by Bruzelius off the coast 

 of Bohusliin, is easil}' recognizable by its extremely slender and narrow 

 body, the small coxal plates, the imperfectly developed eyes, and the 

 structure of the gnathopoda. It also grows to a mv;ch larger size than any 

 of the other species. 



Occurrence. — I have not myself met with this form, biit Boeck 

 states its occurrence at Christiansund, west coast of Norway, and I have 

 seen a few specimens taken by Mr. Schneider in the neighbourhood of Tromso. 



Distribution. — Greenland (Hansen), Spitsbergen (does), Bohuslan 

 (Bruzelius), Kattegat (Meinert), British Isles (Norman). 



Gen 9. Elasmopus, Costa, 185G. 



Syn: Megamsera, Sp. Bate (part). 

 » Msera, Heller (part). 



Body comparatively strongly built and ([uite smooth, with the coxal 

 plates of moderate size, 4th pair the largest, and distinctly emarginated 

 posteriorly. Cephalon without any rostrum, and having the lateral corners 

 rounded off. Eyes well developed. Superior antennae longer than the inferior, 

 and provided with a comparativelj^ small accessory appendage. Oral parts 



