394 

 Stenheliopsis media, G. 0. Sars, n. sp. 



(Suppl. PI. 25, fig. 2). 



Specific Characters. Female Body comparatively less robust than in the 

 preceding species, more resembling that in the type one. Rostral plate of a 

 similar shape to that in 8. latifurca, though perhaps a little less broad. Urosome 

 shorter than the anterior division and slightly tapered behind, last segment com- 

 paratively small and deeply cleft at the end. Caudal rami much narrower than 

 in the preceding species, though not nearly so extremely slender as in the type, 

 and considerably divergent, apical setae, as in the 2 other species abruptly curved 

 outwards. Anterior antennae resembling those in 8. latifurca, though only com- 

 posed of 5 distinctly defined joints, the penultimate one being wholly coalesced 

 with the preceding joint, so that the terminal part only consists of a single joint. 

 Posterior antennae and oral parts nearly as in 8. latifurca. 1st pair of legs 

 likewise of a very similar structure, though having the 1st joint of the inner ramus 

 still broader in proportion to its length and provided inside with a well developed 

 seta. Natatory legs, as in the preceding species with both rami distinctly 3-arti- 

 culate, but of far less robust form, last joint of both rami much narrower and 

 exhibiting a quite normal armature. Last pair of legs resembling those in 8. 

 latifurca, each forming a simple quadrangular lamella edged with 6 setae. Ovisacs 

 very small, each onl-y containing a single ovum. 



Colour pale yellow. 



Length of adult female 0.46 mm. 



Remarks. As to the external appearance, the present form more 

 resembles the type species than does the preceding form It is however 

 undoubtedly more nearly allied to the latter than to the former, as proved by 

 the structure of the several appendages. In the shape of the caudal rami it 

 occupies, as it were, an intermediate position between both, a feature which has 

 given rise to the specific name here proposed. 



Occurrence. Some specimens of this small Copepod, all of the female 

 sex, were taken in the harbour of Farsund, from a depth of about 20 fathoms, 

 muddy bottom. 



Page 209. 

 Mesochra pygmwa (Claus). 



Distribution. Pole* Islands north of Grinnell Land (2nd Fram Exp.). 





