190 THE PLAGIOSTOMIA. 



OXYNOTUS CENTRINA. 



Regnard de mer Belon, 1551, Hist. nat. poissons marins, p. 46 bis, fig. 



Vtdpecula Belon, 1553, Aquat., p. 63, 64, fig. 



Cenlrina Rondelet, 1554. Pise, p. 384, fig.; Salviani, 1554, Aquat., f. 157, pi. 56-57; Gesner, 1558, 



Aquat., p. 718; Aldrovandi, 1613, Pise. & Oct., p. 401; Willughby, 1686, Pise, p. 58, pi. B 2, B 3. 

 Galeus cenlrina Gesner, 1558, Aquat., p. 1250; Jonst., 1649, Pise, pi. 7, f. 4-5, pi. 31, f. 1; Klein, 1779, 



Neucr schaupl., 8, p. 380. 

 Squalus no. 5 Artedi, 1738, Ichthyologia, Syn., p. 95, Gen., p. 67. 

 Galeus sp. no. 7 Klein, 1742, Hist, pise, miss., 3, p. 10. 

 Squabis cenlrina Linne, 1758, Syst., 1, p. 233; Brunnich, 1768, Ichthy. Massiliensis, p. 3; Bloch, 1785, 



Au.sl. fische, 1, p. 23, pi. 115; Bonnaterre, 1788, Iclith., p. 12, pi. 5, f. 13; Schn., 1801, Bloch 



Ichth., p. 26; Risso, 1810, Ichth. Nice, p. 42. 

 Le Humantin Broussonet, 1780, Mem. Acad, roy., p. 676. 

 La Mielga Cornide, 1788, Paces, p. 128. 



Le squale humanlin Lacep^de, 1798, Poissons, 1, p. 276, pi. 9, f. 3. 

 Oxynotus cenlrina Rafinesque, 1810, Indicc, p. 45, 60; Gill, 1861, Ann. N. Y. lye, 7, p. 405; 



Dumeril, 1865, Elasm., p. 444, pi. 5, f. 8-9. 

 Acanthorinus cenlrina Blainv., 1816, Bull. Soe philom., p. 121; 1830, Poiss. Fr., p. 61, pi. 15, f. 1. 

 Cenlrina cenlrina Cuv., 1817, Reg. anim., 2, p. 130. 

 Cenlrina humantin Cloquet, 1820, Diet., 7, p. 385, pi. 31. 

 Cenlrina salviani Risso, 1826, Hist, nat., 3, Poissons, p. 135; Bonaparte, 1841, Icon. Fauna Ital., Pesci, 



pi. 58, f. 2; MtJLLER & Henle, 1841, Plagios., p. 87; Bocage & Capello, 1866, Plagios., p. 32; 



Capello, 1870, Jor. Acad. sci. Lisboa, 2, p. 145; Gunth., 1870, Cat. fishes Brit, mus., 8, p. 417; 



Day, 1884,- Brit, fishes, 2, p. 319, pi. 161. 

 Cenlrina vulpecula Moreau, 1881, Poiss. France, 1, p. 355. 



Bodj^ rather short and massive, transversely trihedral, having a dermal fold 

 at each side of the belly and a weaker one between the dorsals and behind the 

 head. Head small, short, depressed. Snout broadly rounded; nostrils near 

 the end, anterior nasal valve broad, not lobed. Mouth small, transverse, with a 

 deep groove at each angle passing in front of the teeth but not meeting the groove 

 of the opposite side. Labial folds occur on both jaws; the anterior pair are sepa- 

 rated in front by a V-shaped fold of the skin; hinder pair short and thick, each fold 

 meeting a distinct lower lip that crosses behind the teeth. Upper teeth in a group, 

 of ten rows on a specimen at hand, slender, compressed, pointed; lower teeth in 

 nine rows, broad and subquadrangular in the base, triangular and serrate-edged 

 in the cusp, median tooth erect, lateral teeth oblique. Eyes small; no nicti- 

 tating folds. Spiracles large, behind the eye. Gill openings small, in front of 

 the pectoral. Pectorals small, more than twice as long as wide, inner angle 

 hardly indicated, not reaching to the end of the dorsal fin. Dorsal spines strong, 

 deeply imbedded in the fin, apex only exposed. First dorsal large, length and 

 height about equal to length of the front edge of the pectoral, base above that of 

 the pectoral in front; base of the spine in the hinder third of the base of the fin, 

 whence it inclines forward. Second dorsal about half as large as the first, base 

 nearly twice its length farther back, about one length from the caudal. Ventrals 

 short and broad, bases below the middle of the base of the second dorsal. Caudal 



