148 THE PLAGIOSTOMIA. 



Galeocerdo. 



Galeocerdo MIj^lleb & Henle, 1837, Sitzb. Akad. wiss. Berlin, p. 115; 1837, Wiegm. archiv., p. 397; 

 1841, Plagios., p. 59. 



Body stout, elongate, head depressed, snout short, broad. Mouth large, 

 greatly arched. Labial folds on both jaws. Teeth alike in both jaws, com- 

 pressed, subtriangular, oblique, more flattened on the outer side and swollen on 

 the inner, denticulate on the edges and the edges of the denticles serrated, deeply 

 notched on the outer edge and convex on the inner. Spiracles small, behind the 

 orbit. First dorsal above the space between the pectorals and the ventrals; 

 second dorsal above the anal. Caudals elongate with pits above and below at 

 the origins. A nictitating membrane. Numerous species occur in the early 



Tertiaries. 



Galeocerdo arcticus. 



Plate 43, fig. 6-8, (brain). 



Le squale milandre Lac^pJide, 1789, Poissons, 1, p. 237, pi. 8, f . 4 (jaws). 



Squalus arcticus Faber, 1829, Fische Islands, p. 17; Nilsson, 1832, Prodromus, p. 115. 



Galeus sp. Agassiz, 1835, Rech. poiss. foss., 3, pi. E, f. 5, 6; Owen, 1845, Odont., pi. 28, f . 9. 



Galeus maculatus Ranzani, 1839, Novis spec, piscium, 1, p. 7, pi. 1; 1840, ibid., 4, p. 68, pi. 8. 



Galeocerdo tigrinus Muller & Henxe, 1841, Plagios., p. 59, pi. 23; Gray, 1851, Chondropterygii, p. 54; 



Blyth, 1860, Journ. Asiat. soc. Bengal, 29, p. 36; Gill, 1864, Proc. Acad. nat. sci. Phil., p. 263; 



Dum:6ril, 1865, Elasm., p. 393; Gunth., 1870, Cat. fishes Brit, mus., 8, p. 378; Day, 1878, 



Ind. fishes, p. 718; Jord. & Gilbert, 1883, Bull. 16, U. S. nat. mus., p. 21; 1896, Jord. & Everm., 



Bull. 47, U. S. nat. mus., p. 32; Jord. & Snyder, 1904, Proc. U. S. nat. mus., 27, p. 940. 

 Galeocerdo arcticus MtJLLER & Henle, 1841, Plagios, p. 60, pi. 24; Kroyer, 1853, Danm. fiske, 3, p. 



933; Nilsson, 1855, Fisk. Skand., 4, p. 717; Dum^ril, 1865, Elasm., p. 394; GiInth, 1870, Cat. 



fishes Brit, mus., 8, p. 377. 

 Carcharias (Prionodon) fasciatus Bleeker, 1852, Verh. Bat. gen., 24, Plagios., p. 37. 

 Boreogaleus arcticus Gill., 1861, Ann. N. Y. lye, 7, p. 411 (name only). 

 Galeocerdo maculatus Poey, 1868, Repertorio, 2, p. 453; 1876, An. Soc. Esp. hist, nat., 5, p. 201, pi. 9, 



f. 7. 

 Galeocerdo rayneri Macdonald & Barron, 1868, Proc. Zool. soc. Lond., p. 368, pi. 32; GtJNTH, 1870, 



Cat. fishes Brit, mus., 8, p. 377; Day, 1878, Ind. fishes, p. 718, pi. 187, f. 3. 

 Galeocerdo obtusus Klunzinger, 1871, Syn. fische, 2, p. 664. 

 Galeocerdo fasciatus Kampen, 1907, Bull. Dept. agric. Ind. Neerl., 8, p. 9. 



Body massive, somewhat compressed and elongate; head much broader than 

 high; snout very short and broad, outline from the eyes nearly semicircular. 

 Internarial distance greater than length of snout ; nasal valve short, with a small 

 rounded lobe. Eye moderate, orbit longer than wide, pupil rounded. Spiracles 

 small, elongate, behind the orbit on a level with the top of the eye. Mouth 

 large, length nearly two thirds of the width, much more than the length of the 

 snout. A long labial fold on the upper jaw, on the young appearing as if doubled, 

 lower fold much shorter. Teeth alike on both jaws, in 21-25 rows, bases broad, 

 cusps broad, oblique, inner edge convex, inclined outward, outer edge deeply 

 notched, edges denticulate, denticles with fine serrations. Nictitating membrane 



