24 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOl.OGY IV. 



anal, and of the lower caudal lobe black". {Gilnther.) Tropical seas; a 

 stray s])ecinieu taken at Wood's; Hole, Mass. 



( Carcli((rUi>< < I'linodnii) liiiihaiK.s M. & H., 49 ; Carcharias limhatHS Gunther, viii, 373.) 

 20.— A P RIO WO DO IV Gill. IMC.l. 



Smooth-toothed Sharki^. 

 (Aprion Miiller & Heule, preoccupied. ) 

 (Gill, Ann. Lyf. Nut. Hist. N. Y. vii, 411: type Squalus puuetatua Mitcli.) 



Snout more or less produced and conic ; teeth entire, without serr* 

 or basal eusi)s, all of them narrowed on a broad base, the lower erect, 

 tlie upper erect or only slightly oblique ; dorsal more or less posterior, 

 o})posite the si)ace between pectorals and ventrals. (a, privative; r.fnio',, 

 saw ; ('x'lM-^, tooth ; the edges of the teeth being always entire.) 



2D. A. peBBictatus (Mitch.) Gill. — Smoofh -toothed Shark. 



•• Distance of the extremity of the snout from the mouth equals that 

 between the nostrils. Pectoral fin subfalciform, extending to the end 

 of the dorsal. Second dorsal much smaller than the first." {Gilnther.) 

 Atlantic ; probably not common on our coast. 



{fSquahif piinctatiis Mit. Lit. & Phil. Trans. N. Y'. 1, 483: Carcharias isodon M. & H. 

 3^: Carcharkifi pmirtatiis Giiuther, viii, 361.) 



2 8.- SC0L.I0B01V Mullcr & Henle, 1837. 



Oblique-toothed Sharks. 



(Miilhu- & Henle. Wie<>niann's Archiv i". Naturij-. iii : type ScoUodon laticaudim M. 

 .V- H.) 



Sharks with the teeth entire, oblique and flat, the points directed 

 toward the sides of the mouth, so that the inner margins are nearly 

 horizontal, and present a smooth cutting edge, those in front more nearly 

 erect ; teeth not swollen at the base ; each of them with a deep notch 

 on the outer margin below the sharp point; no spiracles; a pit at base 

 of tail ; first dorsal well in front of ventrals, much larger than second. 

 {(Ty.oALi')-, twisted or crooked; 6<l(hv, tooth.) 

 30. S. terraB-novae (Richardson) Gill. — Sharp-noiicd Shark. 



Body slender; snout depressed, moderately rounded; mouth U-sliajJcd, 

 with a short labial groove at its angle, which groove extends on the 

 upper jaw as well as on the lower; distance between nostrils greater 

 than distance from nostrils to end of snout; gill-openings narrow; first 

 dorsal moderate, midway between pectorals and ventrals ; second dorsal 

 very small, slightly behind, and rather smaller than the anal ; anal fin 

 much shorter than distance from anal to ventrals; a slight furrow along 



