269 



Occurrence. I have met with this species in 2 localities, viz., at 

 Hamraerfest, Finmark, and at Selsovig, lying exactly within the polar 

 circle. It occurred rather sparingly in a depth of 40 to 50 fathoms, among 

 Hydroids. 



24. Metopa pollexiana, (Sp. Bate). 



(PI. 95) 

 Montagua pollexiana, Sp. Bate, Catal. Arnphip. British Mus. p. 57, PI. IX, fig. 2. 



Body rather slender and compressed, but with the back evenly 

 rounded. Cephalon about twice the length of the 1st segment of mesosome, 

 lateral corners broadly rounded off at the tip. Coxal plates of moderate 

 size; 2nd pair a little expanded distally, and having a slight sinus behind 

 the obtusely pointed tip; 3rd pair fully twice as deep as the corresponding 

 segment; 4th pair about as large as the 2 preceding pairs combined, and 

 somewhat broader than they are deep, distal edge but very slightly curved, 

 posterior extremity bluntly rounded. Last pair of epimeral plates of metasome 

 somewhat produced, and distinctly angular at the tip. Eyes of moderate 

 size, rounded, pigment dark red. Antennae slender and elongated; the superior 

 ones equalling in length 2 /s of the body, 1st joint of the peduncle rather 

 elongated, nearly as long as the cephalon and the 1st segment of mesosome 

 combined, and exceeding that of the 2 succeeding joints taken together, 

 flagellum extremely slender, about twice as long as the peduncle, and 

 composed of about 24 articulations. Inferior antennae considerably shorter 

 than the superior, the 2 outer joints of the peduncle about equal-sized, 

 flagellum scarcely half the length of the peduncle. Anterior gnathopoda 

 rather slender, meral joint forming inferiorly a broadly rounded setiferous 

 lobe, carpus very elongated, and densely setous inferiorly, propodos scarcely 

 more than half as long and rather narrow, palm distinctly defined and 

 nearly transverse. Posterior gnathopoda very largely developed, especially 

 in the male, meral joint, as in M Alderi, continued inside to a triangular 

 ascending lamella, somewhat overlapping the upper edge of the carpus, propodos 

 much elongated, occupying nearly half the length of the leg, and gradually 

 widening distally, palmar edge angularly produced in the middle, with its 

 upper half minutely crenulated, lower corner produced in front to a thumb- 

 like projection defined from the palm by a deep and narrow incision. Same 

 legs in male much more powerfully developed than in female, with the 

 propodos more strongly expanded distally, and the thumb-like projection 



34 Crustacea. 



