30 



DREDGING REPORTS. 



Alteutha hopyroides. Both, of these belong to families which occur 

 chiefly between tide-marks, and of which there remain several 

 British species yet requiring notice. I therefore here content 

 myself with the simple record of their capture in the open sea, 

 leaving the more elaborate description of them until their con- 

 geners also can have due attention. One structural character in 

 the Calanida? and allied families seems scarcely to have attracted 

 the attention it deserves as a specific mark, namely, the form of 

 the terminal spine of the outer branch of the swimming feet ; 

 and more especially, the arrangement of the supplementary spines 

 at its base. These will be found, in some cases at least, to afford 

 diagnostic marks quite sufficient for the determination of a species, 

 and I have therefore figured side by side, in plate I, the spines 

 from the feet of all the British species. The figures are, in each 

 case, taken from the fourth swimming foot. 



CLADOCERA. 



Evadne Nordmarmi, Loven . , 

 Pleopis polyphemoides, Leuckart 



COPEPODA. 



Thalestris longimana, Claus .... 



Alteutha bopyroides, Glaus .... 



Cetochilus septcntrionalis, Goods. 

 Calanus Clausii, G. S. Brady . . 

 Dias longiremis, Lilljeborg ...... 



Temora Fininarchica, Gunner . . 

 Ichthyophorba haniata, Lillj. .... 



denticornis, Glaus. . 

 Anomalocera Patersonii, Templet. 



1862. 



50-100 miles 



east of 

 Tynemouth. 



common 

 scarce . . 



scarce , . 

 common 

 common 

 common 

 common 



frequent 



1863. 



Northumber- 

 land coast, 

 (Holy Island.) 



common 

 scarce . . 

 common 

 scarce . . 

 common 



frequent . . 



1863. 



Durham coast, 

 (offRyhope.) 



common, 

 common. 



rare. 



rare. 



common. 



common. 



common. 



common. 



common. 



Ordek. CLADOCERA. 



Fam. polyphemim:. 



Genus. PLEOPIS,* Dma. 

 General form very like Polyphemus. Head moveable, separated 

 above by a deep impression from the thorax, below thick and 



* As defined bv G. O. Sars. 



