247 



8. Probolium calcaratum, Gr. 0. Sais. 



(PI. 86). 

 Metopa calcarata, G. O. Sars, Overs. Norges Crust. I, p. 92, PI. 4, fig. .5. 



Bod}' comparatively somewhat more compact of form than in the 

 preceding species, at least as regards the female. Cephalon scarcely twice 

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

 angixlar, in male more rounded. Second pair of coxal plates obliquely 

 curved in front, outer part somewhat narrowed, especiallj'- in the male ; 3rd 

 pair gradually widening below, and nearly twice as deep as the corresponding 

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

 bluntly produced posteriorly, distal edge strongly curved in its hind part. 

 Last pair of epimeral plates of metasome somewhat more produced at the 

 lateral corners than in P. gregarium. Eyes very large, oval quadrangular 

 in form, and nearly occupying the entii-e height of the cephalon, visual 

 elements less perfectly developed, pigment light red. Superior antennge 

 scarcely attaining half the length of the body, 1st joint of the peduncle 

 rather thick at the base, and exceeding in length the 2nd, flagellum but 

 little longer than the peduncle. Inferior antennse nearly as long as the 

 superior, last joint of the peduncle somewhat shorter than the penultimate 

 one. Anterior gnathopoda almost exactly as in P. gregarium. Posterior 

 gnathopoda in female somewhat less strong, propodos not nearly attaining 

 the length of the basal joint, and triangular oval in form, palm somewhat 

 oblique, about as long as the hind margin, and defined from the lattei' by 

 an obtuse angle, its edge nearly straight, very slightly serrated, and armed 

 in its posterior part with 3 small spinules, dactylus of moderate size. 

 Same legs in male very much produced, meral and carpal joints comparatively 

 small, rounded, and scarcelj' at all produced inferiorly, propodos very long 

 and curved, its inferior edge slightly concave and densely hairy, without 

 any dentiform projections, but forming in front a slight lamellar expansion, 

 finely serrated at the edge, dactylus very much elongated, and ciliated along 

 the inner edge. Anterior pairs of pereiopoda about as in P. gregarium; the 

 3 posterior pairs comparatively still shorter and more robust, meral joint 

 very large, and much produced at the inferior corner, which, on the last 2 

 pairs, extends even considerably beyond the carpal joint, basal joint 

 of the latter pairs nearly as in the preceding species. Last pair of 

 uropoda somewhat less robust, basal joint about the length of the other 

 2 combined, and armed with 5 denticles. Telson comparatively shorter 

 and broader than in P. gregarium, and armed with only 3 pairs of 

 dorsal denticles. Colour uniformly whitish, without any pigmentation; 



