SALT-MARSHES OF NORTHUMBERLAND AND DURHAM. 127 



made on the ground of similarity of valves to the smoother indi- 

 viduals of C. torosa. Subsequently the limbs of the Grravesend 

 specimens were examined and misplaced to the fossil valves (the 

 fossil valves of Grays and the recent carapaces of Gravesend being 

 regarded as belonging to the same species). It seems, there- 

 fore, unavoidable, that the term torosa must in future be applied 

 exclusively to the fresh-vt^ater species (lacustris, Sars), and that 

 the smooth brackish v^ater species (torosa, Sars and Brady) must 

 take an entirely new name : with this view, the specific name 

 littoralis is here proposed. 



Genus. LOXOCONCHA. G. 0. Sars. 



LoxocoNCHA ELLiPTiCA, Brady. 



Loxoconcha elliptica, Brady. Monograph of recent British Ostra- 

 tracoda, p. 435, Plate XXVII., figs. 38, 39, 45-48; and 

 Plate XL., fig. 3. 



I first found this species in May, 1865, in pools near the 

 mouth of the Wansbeck; and in May and July, 1867, more 

 abundantly at Seaton Sluice. Mr. Norman has also taken it in 

 Arnold's pool, Guernsey. Still more recently I have found it in 

 various localities in Ireland, and have seen it in a gathering from 

 the estuary of the Thames. 



Oeder. COPEPODA. 

 Family. CYCLOPID^. 

 Genus. CYCLOPS, Miiller. 



Cyclops Lubbockii, n. sp. (Plate IV., figs. 1-8.) 



Superior antennae of the female fourteen-jointed, the eighth 

 joint being incompletely divided, the last two joints the largest, 

 seventh, ninth, eleventh, and thirteenth joints each armed Avith 

 a single long apical seta, the last joint with six. Penultimate 



