110 Part III. — Twenty-first Annual Report 



The number of Crustacea described in the present paper is scarcely 

 so large as in some of those previously published. 



I am, as formerly, indebted to my son Mr. Andrew Scott, A.L.S., for the 

 drawings required to illustrate the new and rare species described here ; 

 and the arrangement of the species is similar to that adopted in previous 

 papers. 



CRUSTACEA. 



Sub-Class ENTOMOSTRACA. 



Order I.— COPEPODA. 



Calanoida. 



Genus Eucalanus. 



Eucalanus crassus, Giesbrecht. 



1881. Eucalanus crassus, Giesb., Atti. Ace. Lincei Rend., ser. 4, 

 vol. 4, lem. 2, p. 333. See also Pelagisch. Copep. Golfes 

 von Neapel, pp. 131-152, t. 11 and 35. 



Several specimens of this species were captured about 10 miles off 

 Aberdeen on November 6th, 1901. This is the first time that Eucalanus 

 crassus has been taken so far south on the east side of Scotland. The 

 species has been several times captured in the Moray Firth,* and it has 

 also been collected along with ' Eucalanus elongatus about fifty miles 

 south-east of Fair Island.f Dr. R. Norris Wolfenden records it from the 

 Faroe Channel, where he has also taken several other interesting species.j: 



Genus Stephos, T. Scott (1892). 



Stephos scotti, G. O. Sars. PI. ii., figs. 1-4. 



1897. Stephos gyrans, T. Scott (not Giesbrecht), 15th Ann. 



Rept. Fishery Board for Scotland, pt. iii., p. 146, pi. iv., 



fig, 9; pi. iii., figs. 17-18. 

 1892. Stephos scotti, G. 0. Sars. An Account of the Crustacea 



of Norway, vol. iv., p. 63, pi. xliii. 



This species was first observed in some material dredged in 1896 in 

 Loch Gair — a small lagoon opening into Loch Fyne. Only a single 

 female was obtained on this occasion, and, as it had a somewhat close 

 resemblance to Stephos gyrans, Giesbrecht, it was ascribed to that 

 species. Additional female specimens were subsequently obtained not 

 only in other parts of the Clyde area but also in the Firth of Forth, but 

 till quite recently no males had been observed among Scottish specimens. 

 Prof. G. 0. Sars, however, had already obtained both sexes of the species 

 in Norwegian waters, and had found that the males especially differed 

 considerably from the males of Stephos gyrans, and, therefore, in vol. iv. 

 of his great work on the Crustacea of Norway described it under the 

 name given above. 



It happened that I had a gathering of small Crustacea which had been 

 collected in 1894 in an old quarry near Granton to which the tide has 

 access during high water. This gathering, which was examined during 



* Eighteenth Annual Report of the Fishery Board for Scotland, Part III., p. 382 (1900). 

 t Nineteenth Annual Re/port of the Fisliery Board for Scotland, Part III., p. 237 (190F. 

 Journ. Marine Biol. Assoc., vol. vi., No. 3 (January, 1902), p. 361. 



