126 



TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 



Sharks and Dog-fishes (Fig. XXVII.). 



These predatory and destructive fishes are represented 

 in the Irish Sea by nine or ten species. The spotted dog- 

 fish (fig. XXVII., A), or blind govag, as it is called 



Fig. XXVII. — Cartilaginous Fishes. 

 Scijllium canicula, the Spotted Dog-fish (reduced.) 

 Acanthias vulgaris, the picked Dog-fish (reduced.) 

 Raia clavata, the Thornback Ray (reduced.) 

 Egg-case of Scyllium canicula (half natural size-) 

 Egg-case of Raia clavata (half natural size.) 



by the Manx fisherman, is seldom absent from our 

 tanks, while the picked dog-fish (13) easily recog- 

 nisable by the formidable spines in front of each 



