SHARKS. 101 



resembles that of the Dipnoids. In fact this Suborder connects [Case ^^0. 

 the Ganoids with the Plagiostomes. It contains one family only, 

 represented in the living fauna by two genera — Chimara and 

 Callorhynchus. Of the former three species are known — Ch. mon- 

 strosa, from deep water off the coasts of Europe, Japan, and the 



Fijr. 90. 



Egg of a Dog-fisb (Sci/Uimii) . (From Magelhan Straits.) 



Cape of Good Hope; Ch. colliei, off the west coast of North 

 America; and Ch. affinis, o& the coast of Portugal. Callorhynchus 

 antarciicus is common in the southern temperate zone, and differs 

 from the preceding by the curious shape of the snout, which bears 

 a cartilaginous prominence terminating in a cutaneous flap. 



Plagiostomata, or Sharks and Rays. 



These have from five to seven gill-openings and the teeth are 

 numerous. They differ greatly among each other with regard to 



