530 THE OCEAN WORLD. 
length, of a general silvery colour, spotted with brown. It inhabits 
the North Sea, living on molluscs and crustaceans; occasionally, as if 
to justify the title which has been given it, levying heavy contributions 
upon the herrings. The Callorhynchus Australis is found in the 
southern hemisphere, and greatly resembles, in its appearance and 
habits, the northern species, In this species the end of the snout 
terminates in a cartilaginous appendage, which is bent backwards at 
the extremity, so as to acquire no small resemblance to a hoe. 
Fig. 357.—Chimzra monstrosa (the Arctic chimera). 
Of the Rama, if we regard them as a sub-order of the Selachia 
we would have at least half a dozen families. In Cephalopteride 
the head is truncated, with large, lateral eyes. In ACpliobatide it is 
projecting, the pectoral fins extending like wings. In Z+ygonide it 
is enclosed by the pectorals.. In the Aadide the body is rhomboidal, 
tail without spine, but with two small dorsals near the top.- In the 
Torpedinide the body is nearly round, the tail short and fleshy, with 
two dorsals and a caudal fin. In Ahénobatid@ the head is prolonged 
into a _sword-like organ, which is armed along its edges with strong 
tooth-like spines. 
