Land, Fresh- Water, and Marine Crustacea. 



297 



sites, which, in the adult stage, are more or less permanently 

 fixed on some part of the fish. 



This arrangement does not differ greatly from that of 

 Professor G. S. Brady's excellent Monograph of the Free and 

 Semi-Parasitic Copepoda of the British Islands, except that 

 the Cyclopidse and Notodelphydae are in that work placed 

 between the Calanoids and Harpacticoids. 



The species recorded in the sequel are distributed among 

 the seven divisions as follows : — 



1st. The Calanoida, represented by 30 species. 



Division Calanoida. 



In the arrangement and nomenclature of the species under 

 this division, Professor G. 0. Sars' work — An Account of the 

 Crustacea of Norvjay, vol. iv., Copepoda Calanoida — is gener- 

 ally followed. See also Professor G. S. Brady's Monograph 

 of the Free and Semi- Parasitic Copepoda of the British 

 Islands, vol. i. 



Family Calanid^. 

 Genus (1) Calanus, Leach, 1816. 

 1. Calanus septentrionalis (Goodsir). 



1843. Cetochilus septentrionalis, Goodsir, Edin. New Phil. Jour., 



vol. XXXV. p. 339, pi. vi. figs. 1-11. 

 1863. Calanus helgolandicus, Glaus, Die frei-lebenden Copepoden, 



p. 171, pi. xxvi. figs. 2-9. 



Hal. — Common in the Pirth. Previously recorded as C. 

 flnmarchicus (Gunn.), but, as indicated by G. 0. Sars, that 

 species is slightly larger, and differs in some structural 

 details, and its distribution appears for the most part to 



