REPORT ON THE COPEPODA. 207 



the shores of Wirral." Found in rock pools on Hilbre 

 Island. 



All the specimens of this species which I have examined 

 were females bearing ovisacs ; and the dorsal edge of the 

 Cephalothorax was strongly spinose (see PL IV, fig. 3). 



Peltidium depressum, Baird. 



Alteutha depressa, Baird, Trans. Berwick Nat, Club, ii, p. 155, 

 1845; Nat. Hist. Brit. Entom., p. 216, tab. xxx, figs. 1-2 

 (1850). 



Kecorded by Byerley as " found occasionally in pools 

 upon the shore." 



Family IX. — Artotrogid^. 



Caligus rapax, Milne Edwards. 

 Kecorded by Mr. Byerley as parasitic upon the Sapphirine 

 Gurnard. 



Caligus milllerif Leach. 

 Recorded by Mr. Byerley as having been found attached 

 in great numbers to a Cydopterus lumpus, and on a very 

 large Thornback. 



Family. — Doubtful. 



, new species (?). 



A single specimen of a very curious female Copepod, 

 with a remarkable constriction in the middle of the cephalo- 

 thorax, was obtained in the townet, in the neighbourhood of 

 Puffin Island, during the cruise of the "Hyaena." It is 

 unlike any species which has previously been described, and 

 Dr. Brady, to whom the specimen was submitted, states that 

 he considers it a very remarkable form, but that he can say 

 nothing positive in regard to it without dissection and careful 

 examination. 



Probably this form is new to science, but it is impossible 



