CRUSTACEA OF NORTHUMBERLAND AND DURHAM 



This species, hitherto referred by most authors to Moiwculus 

 finmanhictis Gunner, is considered by Professor G. O. Sars to 

 be distinct. Gunners description referring to a closely allied 

 form which is chiefly Arctic in its distribution, and differs in 

 its greater size and in some not very important structural 

 details.* So far as we at present know the true C. finmarchicus 

 does not occur in our district. C. sepfe/itn'o/ial/s, on the 

 contrary, is often found in immense numbers, usually near 

 the surface in the open sea, but often also in pools of the 

 littoral zone where it has doubtless been left behind by the 

 retreating tide. N.D. 



Fam. 2.— PSEUDOCALAXID.^ 



PSEUDOCALANUS ELONGATUS Bocck. 



1865. Calanus Claiisii, Brady, Nat. Hist. Trans. Northum- 

 berland and Durham, vol. i., p. 33, pi. i., figs, i, 

 11-13. 



1878. Pseiidocalanus elongafiis, Brady (3), vol. i., p. 45 

 pi. iii., figs. 1-9. 



Very common both in the open sea and in tidal pools. N.D. 



Fam. 3.— CENTROPAGIDtE 

 Centropages typicus Kroyer. 



1863. Ichthyophorba denticornis, Glaus (2), p. 199, pi. xxxv., 



figs. I, 3-9. 

 1865. Ichthyophorba denficoniis, Brady, Nat. Hist. Trans. 



Northumberland and Durham, vol. i., p. 40, pi. iv., 



figs. 1-6. 

 1878. Centropages typicus, Brady (3), vol. i., p. 65, pi. viii., 



figs. i-io. 

 1901. Centropages typicus, G. O. Sars (6), vol. iv., p. 75, 



pis. xlix., 1., li. N.D. 



* The British form was, however, described by H. Goodsir iii 1843 under the 

 specific name sfplentrionalis, and as pointed out in the " Crustacea of Devon and 

 Cornwall," that name must be adopted if the still earlier one used by Gunner be 

 held to apply to a different species. ■ 



112 



