92 THE PLAGIOSTOMIA. 



PRISTIURUS MELASTOMUS. 



Ham gjale Strom, 1762, Sondm., 1, 283. 



Squalus calulus Gunner, 1766, Trondj. sels. selskr., 2, p. 249. 



Rod haae Ascanius, 1777, Icon., 4, p. 5, pi. 38. 



Galeus melaslomus Rafinesque, 1810, Caratteri, p. 13. 



Scyllium catulus 9 Risso, 1S10, Ichth. Nice, p. 30. 



Scyllium arledi Risso, 1820, Journ. phys. chem. et hist, nat., 91, p. 241; 1826, Hist. nat. 3, Pois.sons, 



p. 117. 

 Squalus prionurus Otto, 1821, Conspectus, p. 5. 

 Scylliorhinus delarochianus Blainv., 1830, Poiss. Fr., p. 74. 

 Scylliorhinus melastomus Blainv., 1830, ibid., p. 75. 

 Squalus annulatus Nilsson, 1832, Prodromus, p. 114. 

 Scyllium melanostomum Jenyns, 1835, Man., p. 497; Bonaparte, 1841, Icon. Fauna Ital., Pesci; Kroyer, 



Danm. fiske, 3, p. 832, fig. 

 Black-mouthed dog-fish Yarrell, 1S36, Brit, fishes, p. 375, fig.; Couch, 1867, Brit, fishes, 1, p. 18, pi. 3. 

 Prislidurus melanostomus Bonaparte, 1839, Mem. Soc. sci. Neuch., 2, p. 11; Gray, 1851, Chondrop- 



terygii, p. 32. 

 Pristidurus melanostomus Muller & Henle, 1841, Plagios., p. 15, pi. 7; Lowe, 1860, Fishes Madeira, 



pi. 77, f. 22-23; Dumeril, 1865, Elasm., p. 325; Gunth., 1870, Cat. fishes Brit, mus., 8, p. 407; 



Gerv. & Boul., 1877, Poiss. Fr., 3, pi. 77, f. 22-23; Malm, 1877, Goteb. och Bonus, fauna, p. 623; 



( riGL, 1S80, Elena, no. 525; Moreau, 1881, Poiss. France, 1, p. 284, f. 34; Doderlein, 1881, Man. 



ittiol. Medit., 2, p. 28; Day, 1884, Brit, fishes, 2, p. 314, pi. 160, f. 1; Jensen, 1907, Dan. fiske, p. 



306, pi. 27, f. 2; Regan, 1908, Ann. & mag. nat. hist., ser. 8, 1, p. 463. 

 Scyllium annulatum Xilsson, 1855, Fisk. Skand., 4, p. 713. 

 Pristiurus artedi Bocage & Capello, 1866, Plagios., p. 11. 

 Pristiurus atlanticus Vaillant, 1888, Travailleur et Talisman, Poissons, p. 59, pi. 1, f. 1. 



Body shorter than the tail; head more than one sixth of the total length, 

 broad, depressed; snout long, broad and broadly rounded across the end, with 

 numerous pores. Nostrils large, without nasoral grooves, less than one third 

 of the distance from the mouth to the tip of the snout ; anterior valves very short, 

 angled outward, widely separated across the internarial space, about equidistant 

 from the mouth and from one another; posterior valves rudimentary. Mouth 

 large, width nearly equal to the length of the snout, or equal to twice the oral 

 length; labial folds short, less than one third of the length of the jaw, around 

 (he angle. Teeth small, in ff rows in the specimen in hand; symphyseal 

 teeth ven r small, erect, with a lateral smaller cusp at each side; lateral teeth 

 with two small cusps on the inner side of the larger median cusp and one or 

 more on the outer side. Eye large, hardly half as long as the snout. Spiracle 

 small, close behind the eye. Gill openings narrow, hindmost above the pectoral. 

 Pectorals large, muscles of the bases closely bound with those of the body, fin 

 long, broad, subtruncate on the hind margin, broadly rounded on the inner 

 angle. Dorsals small, subequal; origin of the first dorsal above the hindmost 

 fourth of the bases of the ventrals; origin of the second above the hinder half 

 or two fifths of the base of the anal, and end of base opposite to that of the anal 



