456 FISHES CHAP. 
the Right Whale, which it attacks, biting pieces out of its body. 
Scymnus 18 viviparous, Laemargus oviparous, and the latter is 
unique among Sharks in producing eggs devoid of a horny shell, 
which are deposited on the sea-bottom. Eehinorhinus has dermal 
denticles in the form of relatively large rounded tubercles, each 
surmounted by a tuft of fine spines. One species only is known, 
E. spinosus, a large Shark attaining a length of 10 feet, and 
frequenting deep water off the Atlantic coasts of Europe and 
Africa from the North Sea to the Cape of Good Hope. A single 
specimen has been taken at Cape Cod on the eastern coast of 
the United States, and another off Dunedin, New Zealand. 
The capture of thirty examples in British waters since 1828 
has been recorded,' the largest a female 9 feet in length. 
Most of the existing genera of Spinacidae are represented by 
teeth or detached spines in the later Tertiary deposits, but none 
are certainly known to occur earlier than the Pliocene. 
Fam. 14. Rhinidae (Angel-Sharks).—Ray-like Sharks with a 
flattened head and body, and nearly terminal mouth and nostrils. 
Pectoral fins very large, horizontally expanded, but constricted 
at the base and not adherent to the sides of the head or trunk. 
Fic. 261.—The Angel-Shark (Rhina squatina). A, dorsal view ; B, view of the mouth 
and nasal barbels. p.f, Pectoral fin ; pv.f, pelvic fin ; sp, spiracle. 
Two dorsal fins, both small, without spines, and situated on the 
tail behind the pelvic fins. Anal fin absent. Spiracles large 
1 Day, op. cit. p. 324. See also Stead, Journ. Mar. Biol. Ass. iv. 1895-97, 
p. 264. 
