66 Stegostoma. 
Kishinouye, Zool. Mag. Tokyo, XV, 1903, p. 42, with figs.; Prov. Shima (a 
male about two meters long and about 24.5 kilogram in weight). 
Habitat.—Prov. Shima ; Sagami Sea; Formosa and Malay Archipelago through 
Indian seas to east coast of Africa and Red Sea. 
Head as measured from tip of snout to first gill-opening 54, ditto as measured 
axially from tip of snout to level of first gill-opening 6, height of body 6% in total 
length as measured to root of lower caudal lobe. Horizontal diameter of eye 12, 
interorbital 1:{,, snout as measured from its tip to anterior rim of eye 14, ditto as 
measured axially from its tip to level of anterior rim of eye 24, horizontal diameter of 
spiracle 16}, its vertical diameter 9}, distance between spiracles 17',, postorbital part 
of head 2}, length of mouth-cleft 2, distance between nostril and tip of snout 43 
in length of head as measured from tip of snout to first gill-opening. 
Body slender, elongate, not compressed, posterior parts much more compressed ; 
body angular, with a dorsal median and two lateral ridges, heptagonal in cross 
section. Head rather small, depressed, upper contour strongly curved, but the lower 
nearly straight; eye small, lateral, much nearer to first gill-opening than to tip of 
snout ; no nictitating membrane ; interorbital very broad, strongly curved; spiracle 
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