LAMNIPJE. 27 



side, and the dorsal being a little further behind the base of the 

 pectoral fin. 



II1>. Red Sea and Indian Ocean, also the Atlantic and Medi- 

 terranean. This species attains to a very large size. 



2. Genus ODONTASPIS, Agassi/. 

 Syn. Triykchis, Miiller & Henle. 



Spiracles minute and above the angle of the mouth. No nicti- 

 tating membrane. Mouth wide and crescent-shaped. Teeth large, 

 awl-shaped, and with one or two cusps at the base. Gill-openings 

 of moderate size. Two spineless dorsal fins, the first opposite the 

 interspace between the pectoral and ventral ; the second dorsal 

 and the anal not much smaller than the first dorsal. A pit present 

 or absent at the root of the caudal fin. 



Geographical Distribution. Temperate and tropical seas. 



28. (1.) Odontaspis tricuspidatns. (Fig. 8.) 

 Carcharias tricuspidatus, Day, Fish. India, p. 713, pi. clxxxvi, fig. 1. 

 Dundatiee, Sind. 



Length of preoral portion of the snout equal to half the width 

 of the mouth, and not equal to half the distance between the eye 

 and the first gill-opening; no groove at the angle of the mouth. 



Fig. 8. Odontaspis tricu$pidatus. 



Nostrils nearer to the mouth than to the end of the snout. Gill- 

 openings much wider than the orbit. Teeth j*|^*, very large, awl- 

 shaped, smooth except at the base, where there exists a small basal 

 cusp on either side. The fourth tooth on each side of the sym- 

 physi s of the upper jaw very much smaller than those next to it ; 

 the central tooth on each side of the symphysis of the mandibles 

 slender; the last few lateral rows in both jaws small. Finn 

 pector al reaching to below the base of the first dorsal ; the inner 

 edge o ne fifth of the length of the outer. First dorsal very slightly- 

 larger than the second, its base situated nearer to the ventral than 

 to th e pectoral. The second dorsal slightly in advance of and 



