I'OHBEAGLK. 



113!) 



p. 8 (Mom. Aond. Koy. Sc. Bclg., l,.ii,. XXXVIII, IS7I); 



Coll., Forli. Vkl. Srlsk. Clirniii 1874, Tilliegsh., p. 208; 



Malm, G/u/s, Boh. Fiia, p. G18; Moii., Hist. Nat. Poiss. 



Fr., toiii. I, p. 290; Dodkrl., Man. Ittiol. Medit., fasc. 



II, p. (ill; Mela, Vtrt. Feim., p. 365, tnb. X; MOb., Hcke, 



Fisch. Osts., p. 151; Jord., Gilb., Bull. U. S. Nat. Hue., 



No. IG, p. 30; Day, Fi.-^li. Gt. Brit., Irel., vol. II, p. 297, 



tab. CLVI; Storm, Norsk. Vid. Sels. Skr. 1883 (Trondhj. 



1884), p. 44; Lillj., ^V., Norg. Fna, Fisk.,vo\. Ill, p. 020; 



Car., Prodi: Fiue Medit., vol. II, p. 505. 

 S(/ualii.<! nasus, Walb., Ichtbyol. Art., Gen., p. 517. 

 Sipmlus monensis, Shaw., Gen. ZooL, vol. V, p. 350; Cuv., 



1. c; Yark., 1. c, p. 387. 

 (?) Imiriis O.ri/rinclms, Rafin., Caratt. Ah: X. Gen. e Spec, 



p. 12, tab. XIII, fig. 1 (fide Doderl., fignra tiiiiien pessiiiia 



fero potius ad Isurum Spallamanii referonda). 



due ti) the small, dciise .'Scales, wliiclr in a Porbeagle 

 18 dm. loiiu' arc niih ' . mm. liroad. ( >ii the upper 

 parts of the body they are seinieireular and thick, with 

 5 elevated, convex stria^, the end.s of which project at 

 the margin of the .scale, forming rounded denticulations. 

 On the under side of the b<)d\- tliev have oidy 3 such 

 ridges. On the fins tiiey ai'e set with equal denseness, 

 but are smooth, as it were worn. 



The iiead, like the body, is without prominent side- 

 margins. The snout in front of the eyes and mouth 

 is conical, its dc])th at the mouth being almost equal 

 to its length. It is denselj- punctated (fig. 330) with 



Fig. 329. Teeth of the upper and lower jaws in a Porbeagle (Isuriis cornnbicns) 213 cm. long. ' 3 nat. size; a, the first three pairs of 

 teeth behind the gap {diastema) on the right side of the upper jnw, nat. .size. 



Sqttalns Selanomis, Leach, Mem. Wern. Nat. Hist. Soc, vol. II, 

 p. 64, tab. II, fig. 2; Flmng (Squ. selanoneiis), Brit. Anim., 

 p. 168 := Selanonitis Watkeri, p. 169. 



The Porbeagle ranks among the larger Sharks. Its 

 ordinar}- length in Scandinavia, however, does not ex- 

 ceed I'/s — 2^2 111- I" the [Mediterranean it attains a 

 length of at least 6 111." 



The bod\" is almost terete, slighth' comjiressed, 

 rounded above and below, and pointed at each end. 

 The greatest depth varies between about '5 and ' , of 

 the length. The skin is everywhere rough as a tile 

 when stroked from behind, but not exactly rasping; in 

 the opposite direction it is soft to the touch. This is 



distinct, impressed, muciferous dots, the mouths of 

 Lorenzinian ampulhe, distributed in 6 broad, multiijlex 

 rows, which are sepanited In- the same numljer of im- 

 punctate stripes, one in the median dorsal line, one 

 vertieallv below this, and two on each side, all con- 

 verging at the tip of the snout, which is also without 

 punctures. Below the eye lies another row of similar 

 dots. The eyes arc round, closely liounded by the 

 slightly oblong orl)ital margins. Their diameter is some- 

 what less than '3 {27- — 31 ?») of the length of the snout. 

 In a dead specimen the jiupil apjjeared to be somewhat 

 oblong and oblitpiely set. There is no nictitating mem- 

 brane. The nostrils are .S'-shaped and transversal, with 



Bonaparte even stales "12 up to 20 or 24 feet," perhaps confounding the species with Carcliarodon Rondelelii. 



