NO. 6.] ACCOUNT OF THE SPECIES. 35 



COPEPODA. 



Tribe: CALANOIDA. 



Division : AMPHASKANDBIA. 



Fam. CALANTOJE. 1 



1. Calanus fiwmarchicus (Gunner.). 



This well-known and widely-distributed species is also by far the commonest 

 of all the Gopepoda in the North Polar Basin explored by the 'Fram' Expedition, 

 forming, indeed, in all the samples, the great bulk of the contents. 



Distribution. Throughout the Arctic Ocean, coast of Norway, the Baltic, 

 British Isles, Atlantic coast of Europe, Mediterranean, Black Sea, North At- 

 lantic Ocean, Pacific Ocean. 



2. Calatws hyperboreus, Kroyer. 



This form also occurred in almost all the samples, being easily recognized 

 by its large size, which is more than twice that of C. fmmarchicus. 



Distribution. Throughout the Arctic Ocean, coast of Norway as far south 

 as the Christiania Fjord, but here confined to greater depths. 



Fam. SCOLECITHRICnXK. 



Gen. Scaphocalcmus, n. 



Generic Characters. Cephalic segment coalesced with the 1st pedigerous 

 segment, and in female distinctly carinated dorsally, exhibiting in front an 

 elevated rounded crest, rostral filaments small, but distinct. Last pedigerous 

 segment well defined, though rather small. Tail in female 4-articulate, with 

 the last (anal) segment short, in male 5-articulate, with the 2nd segment large 

 and tumefied. Caudal rami short, with 5 marginal setae, the innermost but 

 one much longer than the others. Anterior antennae 23-articuIate, the 1st, 

 2nd and 8th articulations much larger than the others; those in male only 

 20-articulate and very slender, with large sensory appendages along the prox- 

 imal part. Posterior antennae with the outer ramus shorter than the inner, 

 and 6-articulate. Mandibles with the masticatory part rather produced, cutting 



1 The families here recorded answer to the respective sub-families of Dr. Giesbrecht. 



