63 



of the terminal segment of the metasome. According to Messrs. Schodte and Liitken, 

 it sometimes attains a length of more than 56 mm., and is thus probably the 

 largest of all hitherto known Mgse. 



Occurrence. — A few specimens of this pretty form are preserved in our 

 University Museum, some having been procured in the Christiania Fjord, some at 

 Farsund, on the south coast of Norway. It has, moreover, been found at Bergen, 

 at Floro, and in the Trondhjem Fjord. The specimens have been taken, some from 

 the skin of the common cod, some from that of the great shark. 



Distribution. — British Isles (Johnston), Skagerak (Meinert), Iceland 

 (Schodte & Liitken). 



6. JEga, aretiea, Ltitken. 



(PI. XXVI, fig. 2.) 

 Mga arctica, Liitken, Vid. Medd. Nat. Hist. Poren. 1858, p. 71, PL 1. A., figs. 1 — 3. 



Specific Characters. — Body oblong oval, with the dorsal face moderately 

 convex, and very smooth. Cephalon but little more than twice as long as it is 

 broad, front slightly produced in the middle. Mesosome with the transverse lines 

 of the 4 posterior segments not very sharply marked; coxal plates of moderate 

 size. Metasome rather large, considerably exceeding half the length of the meso- 

 some, epimera bluntly produced; terminal segment semioval, tip evenly rounded, 

 with a very small apical incision, dorsal face plain, ' edges in the outer part mi- 

 nutely serrated. Eyes of middle size, oval, separated above by a distinct, though 

 small interspace. Antennae unusually slender, the first 2 peduncular joints of the 

 superior ones but slightly expanded, and, combined, scarcely longer than the last 

 peduncular joint. Legs and uropoda normal. Length of an apparently adult 

 specimen 32 mm. 



Remarks. — This species, established by Prof. Liitken, may be easily dis- 

 tinguished from those previously described by the slender form of the antenna?, 

 the comparatively large size of the metasome, and the shape of its terminal 

 segment. 



Occurrence. — A single specimen of this form is preserved in our Univer- 

 sity Museum, having been procured in Finmark, probably from the skin of the 

 great shark. 



Distribution. — Greenland (Ltitken), Iceland (Schodte & Meinert). 



