20 THE PLAGIOSTOMIA. 



Back brownish, with scattered small spots and dots of darker; lower sur- 

 faces light to whitish, 



Mediterranean Sea; Indian Ocean; Eastern North Pacific. 



NOTORYNCHUS PECTOROSUS. 



Heptranchus indicus Macdonald & Barron, 1868, Proc. Zool. soc. Lond., p. 371, pi. 33 (non Aoassiz). 



Notidanus indicus Hutton, 1872, Cat., p. 79; 1889, Trans. N. Z. inst., p. 276; Ogilby, 1888, Cat., p. 6. 



Notidanus (Heptanchus) indicus McCoy, 1880, Zool. Vict., 5, pi. 43, f. 2. 



Heptranchias pectorosus Garman, 1884, Bull. Essex inst., 16, p. 56; Separate, p. 13. 



Notidanus ferox Perez, 1886, Estud., p. 7; Philips, 1887, Ann. Univ. Chile, 71, p. 24, pi. 6, f. 2. 



Heptanchus indicus Ogilby, 1889, Proc. Linn. soc. N. S. W., ser. 2, 4, p. 179. 



Heptranchias haswelli Ogilby, 1902, Proc. Linn. soc. N. S. W., ser. 2, 22, p. 62. 



Notorhynchus indicus Waite, 1904, Synopsis, p. 5. 



Compared with N. plaiycephalus this species is rather more robust; the 

 body appears to be longer and the caudal shorter; the outlines of the head 

 are more regular as seen from above, the snout is more broadly rounded, is less 

 produced between and is less indented at the nostrils. Body elongate, moder- 

 ately stout, subfusiform, depressed anteriorly and compressed backward; the 

 cavity is nearly half the total length in young, more in adult. Head broad, 

 short, blunt. Eye moderate, length about half the distance from the end of the 

 snout. Spiracle very small, on a vertical a trifle nearer to the first gill opening 

 than to the eye. Mouth large, a thin labial fold extending on the lower jaw 

 less than half way from the angle to the symphysis. Teeth compressed, bases 

 quadrate, cusps narrow; a median tooth in the upper jaw, first lateral tooth with 

 indistinct denticles at the base of the primary cusp, second and third laterals 

 with weak denticles on the inner side and stronger horizontally directed ones 

 on the outer, and the following three or four of the laterals have one or more 

 small cusps on each side of the base of the primary cusp. Lower teeth larger; 

 median tooth small, with four or five denticles at each side; laterals large, 

 denticulate on the inner side of the base of the primary cusp which is hardly 

 larger than the three to five, or more, cusps at its outer side, decreasing in size 

 backward. Several rows of small teeth behind the sixth laterals. 



Gill openings seven, in front of the pectorals, widely separated across the 

 chest. 



Pectorals nearly as broad as long, posterior margin slightly indented. 



Dorsal small, origin above the ends of the bases of the ventrals, base reach- 

 ing little behind a vertical from the origin of the anal. Anal smaller than the 

 dorsal, origin below the hinder portion of the base of the latter. Caudal shorter 

 than that of A^. plaiycephalus; subcaudal with a low angle or lobe anteriorly, 



