28 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



larger Hum the second. both similar to the. anal; pectoral fins short, 

 obtuse, or truncate; color gray. L. 1 to <> feet. 



A small voracious shark with very sharp teeth, rather common on 

 our Atlantic coast. 



i ></(i///.s aiiu-rii-iiintx Mitch. Trans. Lit. & Phil. Soc. lfl-1. i, -IK?: St/nalus littontlix 

 -Mitch. Am. Monthly Mag. ii. 1^1-', :i-^: Carcharioa griseus StoTQT, Fishes Mass. '211: 

 udnitttiKjiix nun riruiiit* (Jiinther. viii. IJ'J.'i : ^iit/(nii]iliodiin littni-ulix (Jill, 1'roc. Ac. Nal. 

 Sri. Phila. 1-li.l. -Jl',0.) 







FAMILY XL LAMNI1LE. 

 (The Porbeagles.) 



Sharks of large size, with the body stout, the mouth wide, with large 

 teeth, and the caudal I'm lunate, the two lobes being 1 not very unequal, 

 the upper lobe strongly bent upward; caudal peduncle with a keel on 



each side: gill-openings wide, all in front of the pectorals, entirely lat- 

 eral, not extending under the throat ; first dorsal large : pectorals large ; 

 vcntrals moderate : second dorsal and anal very small; a pit at the root 

 of the, caudal; spiracles minute or absent. Genera .'>; species (i or 

 more. Those inhabiting our coasts have been much confused by authors. 

 (Ldiiiniilir, part, (liinther, viii, oSU-.'Wl*.) 



Teeth with fill in- edges. 



. Teelli \\iihoiit basal cusps, lon^, Hexiious, prismatic. ;nul acute.. -I8URU8, 26. 



IKI. Teeth, or must ol' them, willi :i small cusp on each side at base, compressed, 



sharp, and somewhat triangular ................................ LAMXA, 127. 



**Teeth with serraied ed^es. compressed, and triangular iu form . . O.vuciiAKODOX, 28. 



26. ISURUS Ralines,|Uf, IrilO. 



Porbeagles. 



(Oxyrlrina Ag. ) 



(Ratines(|iie. ( 'aratteri di Alciini Xnovi tiencri: type IXHI-H* <>.ri/rlii/>icliitx Kat'. ^ri/r/nwfl 

 epallanzanii l?on. i 



Snout rather long and pointed; first dorsal and pectorals large : sec- 

 ond dorsal and anal very small: caudal peduncle slender: teeth long, 

 lanceolate, with sharp entire cut t ing edges and no basal cusps. (. ; Vr, 

 eijiial: '/, tail ; I he I \vo lobes of t he tail being nearly equal, as in all 

 the members of this family.) 



* Firs I dorsal inserted eniirch liehind peeioraU. nearly midway between pectorals and 

 veil Ira Is. ( Imiro/ixix (Jill.) 



.'. I. ^lillirtis i.M. A II. > .lor. A (Jill.. .1/,/c/,,,-, / 



This sj)ecies, if really occurring on our coast, will be known from the 

 other Ixnri by the position of the dorsal, which is distinctly behind the 



