52 



the carpus, and somewhat obliquely truncated at the tip, dactylus short and 

 simple. Posterior gnathopoda not much longer than the anterior, propodos 

 half as long as the carpus and about of uniform breadth throughout. Last 

 pair of uropoda with the rami scarcely longer than the basal part. Telson 

 rather small, oval, nearly twice as long as broad, and evenly rounded at the 

 tip, with 2 small apical denticles. Colour whitish with greenish intestine; 

 ova in the marsupial pouch orange-coloured. Length of female 5 mm., of 

 male 3 l /z mm. 



Renwrl's. This is the only as yet known species of the genus; for 

 none of the earlier described forms of Lysianassidse can properly be referred 

 to it, at least so far as our present knowledge of them goes. 



OccnrrrHcr. - Although rather rarely met with, this small Lysianassid 

 would seem to occur along the whole coast of Norway. I first detected it in 

 the Lyngdalsfjord near Farsund, on the south coast of Norway, in a depth of 

 about 100 fathoms, and have subsequently found it again in several localities 

 both on the south and west coast and even so far North as Mehavn near 

 Xordkap, Finmark. Out of Norway it has as yet not been recorded. 



Gen. 12. Callisoma, Costa, 1851. 

 Syn: Scopelocheirus, Sp. Bate. 



Body rather thickset, glabrous, with large coxal plates. Superior 

 antennae much shorter than the inferior, with the peduncle considerably 

 tumeficated, 1st joint of the nagellum in male very large, accessory appendage 

 comparatively small. Inferior antennae slender and elongated in both sexes 

 but especially in male, basal joint much tumeficated; flagella of both pairs 

 in male provided with distinct calceolae. Epistome slightly projecting, rounded, 

 and defined from the likewise rounded anterior lip by a distinct sinus. 

 Posterior lip membranous, with widely diverging lateral corners. Mandibles 

 rather powerful, with the molar expansion considerably projecting and tapering 

 towards the tip; palp large and densely setous, originating at about the same 

 level as the latter. First pair of maxillse with the masticatory lobe com- 

 paratively short and rounded at the tip, which is armed with numerous 

 unequal spines ; basal lobe rather large, triangular, with a series of strong 

 plumose setae on the inner edge ; palp of usual structure, apical denticles 

 bifurcate. Second pair of maxillae with both lobes short and broad and 

 densely setous, the setae of the inner lobe partly plumose and continued down 

 the inner edge. Maxillipeds with the masticatory lobe comparatively short and 



