OFF THE NORTH EAST COAST OF ENGLAND IN IQOI. 9 1 



gatherings made a month later and at a greater distance from 

 land by Mr, Sheppard, who made a five days' trip with a 

 steam trawler. The species so obtained were as follows : — 



Ceraimm tripos, Miill. 



(both short and long-armed forms). 



„ fusus, Ehr. 



„ furca, Ehr. 



„ diverge ns, C. & L. 



Dinophysis acuminata, C. & L. 

 Gymnodinium marinum, S. K. 



Of these species Ceratium tripos was always much the most 

 abundant, but all of the rest occurred in very considerable 

 numbers. 



The hst, embracing only six species, is short as compared 

 with the fifteen species noted by Aurivillius in his memoir on 

 the Plankton of the Baltic*. There were, however, in our 

 gatherings some few forms of doubtful character which may 

 represent other species. 



The other most conspicuous members of the Plankton were 

 chiefly Copepoda belonging to well known species, Calanus 

 helgolandicus, Clausf, Temora longicornis, O. F. Miiller, Isias 

 clavipes, Boeck, Clausia elongata, Boeck, Centropages typicus, 

 Kroyer, C. hamatus, Lilljeborg, Acartia clausii, Giesbrecht, 

 Oithona spinifrons, Boeck, Anomalocera Fatersonii, Templeton/ 

 and with these but in less abundance three Cladocera, Evadne 

 nordmanni, Lovdn, Podon polyphemoides, Leuckart, and F. 

 intermedius, Lilljeborg. 



* Das Plankton des Baltisclien Meeres (Bihang till K. Svenska Vet. — Akad. 

 Handlingar. Band 21. Aid iv. No. 8.— Stockholm 1896). 



+ This is the form hitherto identified by us and by most naturalists with 

 " C. finmarchiciis," Gunner, but Professor G. O. Sars believes that Gunner's species 

 was founded upon a larger and more northern form to which the name finmarchicns 

 must in future be restricted. The differences, however, are extremely slight. 



