LEPEOPHTHEIRUS. 315 



female, oval ; frontal plates small, notched in centre ; caudal 

 plates small; sternal fork with simple sharp-pointed branches. 

 Thorax as long as carapace. 



Hab. Belfast Bay and other parts of our coast, "on the 

 flounder, John Dory, mackerel, sole, and dragonet. 



Lepeophtheirus Nordmannii, M. Edw. sp. — Carapace, 

 in female, rounded-oval, diaphanous. Frontal plates promi- 

 nent in centre, not notched. Thorax much shorter than 

 carapace. Oviferous tubes long and slender. 



Hab. Coast of Antrim, on the Orthagoriscus mola. 



Lepeophtheirus Hippoglossi, Kroyer, sp. — The whole 

 animal beautifully marked with pink or reddish spots, dis- 

 tributed in an irregular pattern over all the carapace, thorax, 

 abdomen, and outer surface of fourth pair of legs. Sternal 

 fork twice bipartite. 



Hab. On halibut, in Berwick Bay. 



Lepeophtheirus obscurus, Baird. — Carapace large, 

 rounded-oval. Thorax much smaller than carapace. The 

 abdomen small, square. Caudal plates stout, and giving 

 off four long, finely plumose setre. Sternal fork with each 

 branch bifurcated. The fourth pair of feet very long and 

 stout. 



Hab. On brill taken in Belfast Bav. 



