60 

 2. JEga, tridens, Leach. 



(Pi. XXV, fig. 1.) 

 JEga tridens, Leach, Trans. Linn. Soc. Vol. XI, p. 370. 



Specific Characters. — Pody somewhat more elongated than in the preced- 

 ing species, being nearly 2 and a half times as long as it is broad. Cephalon 

 rather broad in proportion to its length, and slightly produced in front. Meso- 

 some moderately convex above, and quite smooth, though having the transverse 

 lines of the 4 posterior segments very distinctly marked. Metasome rather broad, 

 with projecting epimera; terminal segment subtriangular, with the tip bi-sinuate, 

 or projecting in 3 obtuse dentiform projections, dorsal face with 3 obtuse carinse, 

 the median one rather narrow, the other 2 gradually widening in front. Eyes, an- 

 tenna:, and legs nearly as in jS. psora. Uropoda with the inner plate obliquely 

 truncated' at the tip, and devoid of any emargination outside. Length 38 mm. 



Remarks. — This form, established by Leach, is nearly allied to the pre- 

 ceding species, though easily distinguishable by the shape and sculpturing of the 

 terminal segment of the metasome, and by the absence of a sinus outside the inner 

 plate of the uropoda. It is also of a somewhat more oblong form than the 

 said species. 



Occurrence. — Two specimens of this form are preserved in our University 

 Museum, having been taken in the Christiania Fjord from the skin of the com- 

 mon cod. It has also been taken occasionally at Bergen and at Christiansund, but 

 seems, on the whole, to be very rare. I have not myself observed it in a 

 living state. 



Distribution. — British Isles (Leach), Faroe Islands (Schodte & Meinert). 



3. JEga, Stromii, Ltitken. 



(PI. XXV, fig. 2.) 



JEga Stromii, Lhtken, Vid. Medd. Nat For. Kjobenliavn 1858, p. 68, PI. I. A, fig.s 6—8. 



Syn: JEga nionopldhalma, var., Johnst. 

 „ „ biearinata, Ratlike (not Leach). 



Specific Characters. — Body oblong oval, more than 2 and a half times as 

 long as it is broad, and rather convex above. Cephalon moderately broad, slightly 

 produced in front. Mesosome with the dorsal face smooth, transverse lines of 

 the 4 posterior segments well defined. Terminal segment of metasome narrowly 

 truncated at the tip, with the posterior edge very slightly emarginated, dorsal 

 face with 2 rather slight and obtuse carina; gradually disappearing in front, edges 

 smooth, finely ciliated. Eyes very large, meeting above in the middle, along a 



