'272 



lateral expansions of the segments only slightly produced and obtuse at the tip: 

 last segment rather small, scarcely half as long as the preceding one, and having 

 the anal opercle considerably prominent. Caudal rami narrow linear in form and 

 slightly divergent, about equalling in length the last 2 segments combined, sette 

 of outer edge small and attached near the end, dorsal seta well developed, middle 

 apical seta about twice the length of the ramus. Eye very conspicuous in the 

 living animal. Anterior antennae resembling in structure those in L. typicus; 3rd 

 joint however comparatively longer. Posterior antennae and oral parts almost 



% 



exactly as in that species. 1st pair of legs likewise of a very similar structure. 

 Natatory legs differing in the presence of well-developed setae inside the outer 

 ramus. Last pair of legs with the proximal part considerably longer than the 

 distal one, and finely ciliated on both edges, carrying inside at the end 2 closely 

 juxtaposed setae, distal part with 5 marginal setae, 3 at the tip and one on each 

 side. Ovisac rounded. 



Male with the anterior antennae somewhat less strongly hinged than in 

 the preceding species. Inner ramus of 3rd pair of legs with the projection of the 

 middle joint very small. Last pair of legs comparatively smaller than in female, 

 with no boundary between the proximal and the distal parts; number of setae as 

 in the male of L. typicus. 



Body of a beautiful violaceous colour, with the ova in the ovisac light green. 



Length of adult female 0.44 mm. 



Remarks. This form, first described by Mr. A. Scott from a solitary 

 female specimen, is at once distinguished from the type species by the peculiar 

 shape of the cephalic segment, and still more by the very prominent lateral pro- 

 cesses issuing from its posterior part. It moreover differs conspicuously in the pre- 

 sence of well-developed seta? inside the outer ramus of the natatory legs, and the 

 shape of the last pair of legs is also somewhat different. 



Occurrence. I have met with this peculiar Copepod not infrequently in 

 several localities both on the south and west coasts of Norway in depths ranging 

 from 10 to 30 fathoms. It is however easily overlooked on account of its 

 small size. 



Distribution. British Isles (Scott). 



