52 



tlic ciirpns, and sumewliat obli(|iu'ly truni'atpil at tlie tip, dactylus shuvt and 

 simjile. Posterior gnatliopoda not mueli loii,2,-pr than the anterior, projiodos 

 half as long as the I'arpns and ahout of uniform breadth throughout. Last 

 pair of uro])oda witli the I'auii scarcely longer than the basal part. Telson 

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

 tip, with 2 small a})ical denticles. Colour whitish with greenish intestine; 

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

 male B'/a nnn. 



Ecmarls. — This is the only as yet known species of the genus; for 

 none of the earlier described forms of LysianassidiP can projierly be referred 

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



Occurrence. — Although rather rarely met \\'ith, this small Lysianassid 

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

 the Lyngdalsfjord near Farsnnd, on the soiith coast of Norway, in a depth of 

 aboiTt 1(H) fathoms, and have snl)seqnently fcmnd it again in several localities 

 lioth on the sontli and west coast and even so far North as Mehavn near 

 Noi-dkap, Finmark. (tut of Norway it has as yet not been recorded. 



Gen. 12. Callisoma, f'osta, 1851. 

 Sj'u: Scopeloclieinis, Sp. Bato. 



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

 antennae much shorter than the inferior, with the pednncle considerably 

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

 comparatively small. Liferior antenna^ 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, ronnded, 

 and defined from the likewise ronnded 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; ]ialp large and denselj^ setons, originating at about the same 

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

 paratively short and ronnded at tlie tip, which is armed with numerous 

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

 plumose seta; on the inner edge ; palp of usual structui'e, apical denticles 

 bifurcate. Second pair of maxillae witli both lol)es sliort and broad and 

 densely setons, the seta- of the inner lobe partly plumose and continued do\^ni 

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



