76 



species of this genus from the Mediterranean, one of which may be the Thy one 

 viridis of Philippi, and Mr. A. Scott has recently added 3 new species from 

 Ceylon. To the Norwegian fauna belongs only a single species, to be described 

 below. 



47. Poreellidium fimbriatum, Glaus. 



(PI. XLIV & XLV). 

 Poreellidium fimbriatum, Glaus, Die freilebenden Copepoden, p. 140, PL XXII, fig. 1. 



Syn: Poreellidium fasciatum, Boeck. 

 viride, Brady (male). 



subrotundum, Norman (young). 



Specific Characters. Female. Body oval quadrangular in outline, width 

 somewhat exceding 2 /s of the length. Cephalic segment very broad and flattened, 

 obtusely truncated in front, with the lateral corners rounded ; rostrum slightly 

 prominent, broad, lamellar, truncated at the tip. Epimeral plates of the 2 suc- 

 ceeding segments large and closely contiguous, being, like the cephalic segment, 

 surrounded by a narrow hyaline rim ; those of 4th segment very small and easily 

 overlooked. Last segment imperfectly defined. Urosome almost semicircular in 

 outline, genital segment expanded on each side to a thin lamella finely ciliated 

 at the edge and encompassing laterally the small quadrate terminal segment to- 

 gether with the 'caudal rami. The latter spatulate in form, about twice as long 

 as broad, and slightly widening distally, tip transversely truncated and provided 

 with 5 very small setae, one of which issues from the inner corner, the others 

 nearer to the outer one; moreover 2 similar setse issue from the dorsal face of 

 each ramus. Anterior antennae scarcely extending beyond the antero-lateral cor- 

 ners of the cephalic segment, angularly bent at the base, and consisting of 6 

 articulations rapidly diminishing in size distally. Posterior antennae with the 1st 

 joint much larger than the others, outer ramus about the length of the middle 

 joint, and carrying 6 plumose setae. First pair of legs with the outer ramus 

 gradually tapering distally, 1st joint much larger than the others, setse of outer 

 edge bulbously dilated at the base, terminal joint with 4 such seta?, and more- 

 over with a slender apical spine and a strong plumose seta inside. Last pair of 

 legs with the distal joint very large, lanceolate, extending between the epimera 

 of the 2nd free segment of metasome and the lateral expansions of the genital 

 segment, so as to look like a pair of epimeral plates. 1 ) Ovisac almost wholly 

 covered by the urosome. 



*) They have also been regarded as such by Prof. Brady, who erroneously describes 

 the lateral expansion of the genital segment as the last pair of legs. 



