20 



DEEP-SEA FISHES OF THE ATLANTIC BASIN. 

 measurements — continued. 



Second dorsal — Continued. 



Greatest height 



Length of posterior margin 



Anal: 



Distance from snout 



Length of base 



i Greatest height. 



Length of anterior margin 



Length of posterior margin 



Caudal: 



Distance from end of second dorsal 



Distance of tip from end of second dorsal 



Greatest -width 



Length of upper lobe 



Greatest width of upper lobe 



Milli- 

 meters. 



Hun 



dredths 



of 



length. 



Caudal— Continued. 



Distance of lower lobe from anal base 



Length of anterior margin of lower lobe. . 



Length of longest margin of lower lobe. - - 

 Pectoral : 



Distance from snout 



Great) -t length 



Width of base 



Greatest width 



Ventral: 



Distance from snout 



Greatest length 



Length of posterior margin (last ray) 



Width of base 



Greatest width 



590 



330 

 109 

 240 



1,655 

 215 

 108 

 170 

 222 



20.0 

 11.2 

 5.7 

 8.0 



56.0 

 7.3 



5.7 

 7.5 



PRISTIURUS, Bonaparte, 



Pristiwrus, Bonaparte, Fauna Italioa, Pesce, 1832, 42. — GOnthek, Cat. Fish. Brit. Mas., vm, 1875, 406. — 

 Canestbini, Fesc Italici, .mi. 



Scyllioid sharks with two spineless dorsal fins, the first above or behind ventrals, the 

 second above hinder end of anal; one or two were of small, fiat spines arranged saw-like 

 on each side of the upper edge of the caudal. Snout elongated, covered with a thick layer 

 of cellular tissue, within which a gelatinous substance is secreted, escaping by numerous 

 pores of the skin. Spiracles present. Nostrils wide, inferior, covered by a valve. Teeth 

 small, tricuspid. Represented by a single species. 



PRISTIURUS MELASTOMUS,(RaFINESQOE), Bonaparte. (Figure 10.) 



lialais melastomus, Raeim -•;! i . Caratt. Anim. l'iant. Sicil., 1810, 13. 



Scylliorhinua melastom'is, I'.i ainvii.i.k, Faun. Franc, 71. 



Scyllium melastomum, Jenyns, Manual, 407. 



Pristiwrus melanostomus, Bon uakii:. Fauna Italica, Pesce, pi. xlix, fig. 3. — Dumeril, Elasmobr., 325. — Oi'N- 



THER, Cat. Fish. Brit. Mus., \ in, 400, Challenger Report, 2.— Collett, Norges Fiske, 407; Nyt, Mag. f. 



Naturvid., xvm, 1884, 117. — Canestrini, Pesci Italici, 51. — Giolioli, Kleneo, 112. 

 Squalus annulatus, Nilsson, Prodromns Ichthyologica Scandinavicse, 113. 

 Scyllium annulatum, Nilsson, Skand. Fauna, 713. 

 Scyllium Artedi, Risso, Hist. Nat. Europe Meridionale, in, 1827, 117. 

 Pristiurus Artedi, BocaGE and Capeixo, Peixes Plagiostoinos, 1S60, 11. — Capello, Joru. Acad. Sei. Lishoa, n, 



139; Catalogo dos Peixes de Portugal, 1880, 44. 

 Scyllium acanthonotum, Dkfil. and Ver. (young specimen, fide Giglioli). 



A Pristiurus with the nasal valves separated by a broad interval and placed nearer to 

 the mouth than to the end of the snout; a short labial fold round the angle of the mouth. 

 Dorsal tins subequal in size, the second above the hinder part of the anal; anal flu nearly 

 as long as the head to the first gill opening; upper parts with rounded darker spots of vari- 

 ous sizes, each with a lighter margin. (Giinther). 



Pristiurus claims a place among deep-sea fishes on account of its captures near Tromsoe, 

 at a depth of 250 fathoms. The species is abundant on the coast of Norway, as far north as 

 Tiondhjems Fiord (hit. 63° 30'), where, according to Storm, it is found in considerable depths 

 (hit, 70°). i f i s ,.,,!.,. on Ohristiania Fiord (lat. 58°). Farther south it is a littoral form, 

 occurring at Madeira and also in the vicinity of Lisbon, where it is rare and is called 

 Leitao or Litao. It is the "Eyed Dogfish" of Couch and Yarrell, who have recorded a 

 single specimen (25 inches long) from the coast of Cornwall, taken by a line fisherman 

 off Polperro, in 1837. 



