III.— SOME ADDITIONAL NOTES ON COPEPODA FROM 

 THE SCOTTISH SEAS. 



By Thomas Scott, LL.D., F.L.S., Mem. Soc. Zool. de France. 



(Plates XIII.-XV.) 



The descriptions of several of the new or rare Copepoda obtained 

 during the investigations that have been carried out under the direction 

 of the Fishery Board for Scotland, and published in the earlier Annual 

 Reports of the Board, were for various reasons somewhat incomplete. In 

 some cases only the female was available for description, the male being 

 at the time unknown ; while in others, where the species, though rare, 

 was already established, only the fact of its occurrence in our seas was 

 recorded and the description of it left to some future occasion. 



In the remarks which follow I "have, with the help of the drawings 

 prepared for me by my son Andrew Scott, A.L.S., endeavoured to 

 describe somewhat fully three curious forms obtained from different 

 Scottish localities, where they have occurred in sufficient numbers to 

 permit of a more accurate study of the peculiar characteristics by which 

 they are distinguished than was possible at the time they were first 

 recorded. 



These species include the two Harpacticoida Harrietella simulans, T. 

 Scott, and Laophontodes typicus, T. Scott, of which only the females 

 have been previously recorded, together with a description of what 

 appears to be the male and female of a remarkable species known as 

 Notopterophorus papilio, Hesse, fouud as a commensal in the branchial 

 chamber of large Ascidians. 



Descriptions are also given of two Copepod parasites of fishes which 

 do not appear to have been previously recorded, and which belong to a 

 somewhat aberrant genus of the Caligoida, viz., Nogagus. 



These different forms are described in the sequel in the order in which 

 they are here referred to. 



It may also be stated that the species mentioned above, though only 

 now described, have been- in my possession for several years, the 

 publication of their description having been for various reasons delayed. 



Division Harpacticoida, G. O. Sars. 

 Fam. Laophontidse, G. 0. Sars. 

 Genus Harrietella, T. Scott. 



Harrietella simulans, T. Scott. PI. xiii., figs. 1-5. 



1894 (?) Laophonte simulans, T. Scott, Twelfth Annual Report 



of the Fishery Board for Scotland, Pt. III., p. 248. PI. vh\, 



figs. 24-32. 

 1906. Harrietella simulans, T. Scott., Ann. and Mag. Nat. Hist. 



Ser. 7, vol. xvii.. p. 464, pi. xi., figs. 9 and 10. 



The structure of Harrietella simulans is in some respects similar to 

 that of Laoplionte, Philippi, and, therefore, while differing considerably 

 in one or two points, it was, when first discovered, ascribed, though 



