62 



the end of the propodos, inside the base of the dactylus. Posterior pairs of legs 

 and uropoda nearly as in M. Stromii. Length of adult animal reaching to 52 mm. 



Remarks. — The present species, established by Prof. Liitken, is very nearly 

 allied to jE. Stromii, and may easily be confounded with it. On a closer exa- 

 mination, it is, however, found to differ in the much coarser sculpturing of the 

 dorsal skin, and the entire absence of any keels on the terminal segment of the 

 metasome, the posterior edge of which, moreover, exhibits a pronounced crenula- 

 tion, not found in M. Stromii. The peculiar cultriform spine issuing from the 

 end of the propodos of the 3 anterior pairs of legs, affords another character, by 

 which this species is distinguished from all the other Norwegian forms. It is the 

 largest of our indigenous iEgae. 



Occurrence. — Several specimens of this species are preserved in our Uni- 

 versity Museum, having been procured from time to time, partly in the Christiania 

 Fjord, partly off the south coast of Norway. It has, moreover, been observed at 

 Bergen, in the Trondhjem Fjord and in Komag Fjord, West Finmark. In every 

 instance, it has been taken from the skin of the great shark (Scymnus microcephalus). 



Distribution. — Iceland (Liitken), Greenland (Liitken). 



5. JEga, monophthalma, Johnston. 

 (Pi. xxvr, fig. i.) 



fflga monophthalma, Johnston, Loud. Mag. Nat. Hist. VII, p. 233, fig. 43. 



Specific Characters. — Body oblong oval, much depressed, somewhat widen- 

 ing behind, dorsal face coarsely sculptured with depressed pits more distinct on 

 the posterior par*t, hind edges of the segments crenulated. Cephalon very broad 

 in proportion to its length, semilunar in shape, front somewhat produced. First 

 segment of mesosome with the anterior edge emarginated on each side, to receive 

 the ocular pax'ts of the head. Coxal plates rather strongly produced, the last 

 pair reaching almost as far as the epimera of the anterior segment of metasome. 

 Anal segment semi-oval, terminating in a well-marked conical projection, dorsal 

 face very coarsely sculptured, and somewhat excavated on each side, having a 

 distinct, though obtuse, carina running along the middle. Eyes exceedingly large, 

 oblong, meeting in front. Superior antenna? with the 1st peduncular joint very 

 large and expanded, 2nd hood-shaped. Epistomal plate sub-pentagonal in form. 

 Legs and uropoda af normal structure. Length of adult animal 50 mm. 



Remarlcs. — This is a very distinct species, easily recognizable by the coarse 

 sculpturing of the dorsal skin, the very large, oblong, contiguous eyes, the greatly 

 expanded 1st and 2nd peduncular joints of the superior antenna 1 , and the form 



