270 



coarser and more produced. Pereiopocla moderately strong, 1st pair somewhat 

 more slender than the 2nd, and having th basal joint rather broad and 

 laminar; last pair with the basal joint comparatively short, scarcely attaining 

 half the length of the remaining part of the leg, and of rounded oval 

 form, meral joint moderately broad, and produced beyond the middle of the 

 carpal one, dactylus in this and the 3 preceding pairs very strong and 

 minutely serrulated on the inner edge. Last pair of uropoda with the basal 

 joint but little longer than the succeeding joint, and armed with a single 

 denticle affixed to a nodiform projection at the end of the outer edge, 

 terminal joint comparatively short. Telson rather broad, triangular oval, 

 with 2 pairs of small dorsal denticles, outer part tapering to an obtuse point. 

 Body whitish pellucid, with a more or less distinct yellowish tinge, each 

 segment having near its posterior edge a narrow orange-coloured band; ova 

 in the marsupial pouch very numerous and of a bright bluish colour. Length 

 of adult female 8 mm., that of male somewhat more. 



Remarks. - This is a very distinct and easily recognizable species, 

 especially highly characterised by the shape of the posterior gnathopoda, 

 the peculiar thumb-like projection of which has, indeed, given rise to the 

 specific name proposed for this form by its detector, Mr. Sp. Bate. 



Occurrence. - I have met with this form rather abundantly in a 

 single locality of the Norwegian coast, viz., Bejan, at the entrance of the 

 Trondhjemsfjord. It occurred here in a depth of 30 to 50 fathoms among 

 Hydroids, especially Hydrallmannia falcata, to the stem of which the specimens 

 were found clinging. Mr. Schneider has, moreover, collected it rather plentifully 

 in the neighbourhood of Troms0. Finally, there are some specimens in the 

 Stockholm Museum, collected outside the west coast of Norway. 



Distribution. British Isles (Sp. Bate), Shetland Isles (Norman), 

 Greenland (Hansen), the Murman Coast (Jarzinsky). 



25. Metopa robusta, n. sp. 



(PI. 96, fig. 1). 



Body short and stout, with very firm integuments. Cephalon scarcely 

 twice as long as the 1st segment of mesosome, lateral corners distinctly 

 angular at the tip. Coxal plates rather large ; 2nd pair obliquely curved in 

 front; 3rd pair about twice as deep as the corresponding segment; 4th pair 

 nearly twice as large as the 2 preceding pairs combined, and much broader 

 than they are deep, distal edge rather deeply sinuated beyond the middle, 



