FISHES. 
315 
Genus 3.—LAMNA.— Cuvier. 
Generic Character .—Snout pyramidal, nostrils situated at its 
base; numerous teeth, set in rows; branchial orifices placed be¬ 
fore the pectoral fins. 
Lamna cornubiensis. — The Porbeagle Shark. 
Plate LXXIV. fig. 4. 
Blue-black above, silvery-white below; tail semilunar, cari- 
nated on each side; caudal lobes nearly equal; teeth small, with 
two basal processes. Eight feet long. Inhabits the European 
seas. 
Genus 4.—ZYGiENA,— Cuvier. 
Generic Character —Head depressed, placed transverse like 
the head of a hammer; eyes situated at the extremities of the 
branches; and the nostrils at their anterior margin. 
Zygcena vulgaris. — The Hammer-Headed Shark. 
Plate LXXIV. fig. 6. 
Body long, dark brown above, and white in the under parts ; 
upper dorsal fin scythe-shaped, the second one small, and near 
the tail. Fifteen feet long. Inhabits the Mediterranean. 
Genus 5. —GALE US. — Cuvier . 
Generic Character .—Body lengthened; snout produced and 
acute; having temporal spiracles; teeth serrated on their exte¬ 
rior side; first dorsal fin situated nearly above the pectoral fins. 
Genus 6.—M U S T E L U S. — Cuvier. 
Generic Character. —Body elongated; snout obtuse; having 
temporal orifices; teeth numerous, close set, and obtuse; dorsal 
fins spineless. 
Genus 7.—NOTIDANUS.— Cuvier. 
Generic Character. —Head small, blunt, depressed, having 
temporal spiracles ; teeth compressed and serrated; with a sin¬ 
gle dorsal fin. 
Genus 8.—S E LA CHE. — Cuvier. 
Generic Character .—Body elongated; head small, with tem- 
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