76 
THE LIVING WORLD. 
The Cat Shark (ScyIlium catulus) , and the Dog Shark (ScyIlium Cani¬ 
cula ), are distinguished alike by their brown-spotted, red color, their destruc¬ 
tion of herring, their possible use as food, and because supplying the shagreen 
of commerce. 
The Tiger Shark, or 
Zebra Shark ( Stegostoma 
tigrinum ), is an inhabitant 
of the Indian Ocean, and 
takes its name from the 
markings of its skin; a 
brownish-yellow ground is 
traversed by black and 
brown bands, or marked by 
dark brown spots. 
The Angel Shark, An¬ 
gel Fish, or Monk Fish 
(Rhina squatina ), is a species 
of ground shark found in 
nearly all seas. It has been 
known to produce twenty 
young at a birth, so that 
its voracity is a serious 
matter for the fish upon 
which it feeds. Its only 
claim to the name, angel 
shark , or angel fish , seems 
to arise from its wing-like 
pectoral fins, unless its dia¬ 
bolical aspect may have 
suggested some fallen angel omitted from Milton’s account of the Satanic Hosts. 
Its smooth, round head evidently suggested to some fisherman the name of 
moiik fish. Its size, rapacity and carnivorousness make it a constant terror 
HAMMER HEAD SHARK. 
great beue shark ( Carcharinus glaucus). 
to fishes, even though not dangerous to man. It is several feet in length, 
and frequently weighs upward of a hundred pounds. It lives on the muddy 
bottom, burrowing its way through the slime and weeds, and quickly seizing 
upon the fish which it thus disturbs. Fishermen make war upon it, not because 
