42 Bulletin 4/, United States National Museum. 



27. APRIONODON, Gill. 



i4j)rioH, MCli.kr it IIenle, Plagiostonien, 32, 1838, piooccupieil, (isodon). 

 Apriiinodoii, (iii.i,, Auu. Lye. Nat. Hist. N. Y., vii, 18G1, 411, {pimckdm — isodon). 



Snout more or less produced and conic; teeth entire, without serrje, all 

 of thcni narrowed, on a broad base, the lower erect, the upper erect or 

 slightly obi i(iue; dorsal more or less posterior, opposite the space between 

 pectorals and vcntrals. («-, privative ; tt/j/w)-, saw ; othv^, tooth ; the edges 

 of the teeth being always entire.) 



.'.7. APRIONODON ISODON, (Miiller & Henle). 



Snout short, little pointed; distance from angle of mouth to nostril 

 twice that from nostril to end of snout; pectorals reaching end of first 

 dorsal, which is much longer and higher than second. Grayish. (Dumeril.) 

 Atlantic Ocean, recorded from New York, Virginia, and Cuba; probably 

 rare, {loog, equal; 6(hvg, tooth). 



Citrcliarias isodon, Mi'Li.EK it Henie, Plagiostomen, 32, 1S3S, New York. 



Carcharias punctalus, Gvntiier, Cat., vni, 301, 1870, New York, (not Sijiialiis pmictatus, Mitchill, 



which is Scoliodon terrx-novie). 

 Aprionodon isodon, PoEY, Enumeratio, 200, 1875. 

 Carcharias isodon, DuMfiRiL, Elasmobranches, 349, 1870. 



28. SCOLIODON. Miiller &. Henle. 



Scoliodon, MC'LlER & Henle, Wiegmamrs Archiv. f. Naturg., iii, 1837, (hdictiudns). 



Teeth entire or very nearly so, obli(iue and flat, the points directed 

 toward the sides of the mouth, so that the inner margins are more or less 

 nearly horizontal, the teeth 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; lips with conspicuous grooves. Otherwise as in Carcha- 

 rhhius, from which the genus is scarcely distinct. Size small, (axolioc, 

 oblique; odov^ , tooth.) 



n. Teeth minutely serrulate above in the adult, less obliiiuo than in (he next; snout sharp, its 

 length from mouth greater than width of mouth. longurio, 58. 



aa. Teeth entire, all very oblique; snout not sharp, its length from month less than width of 

 mouth. teuk.b-nov.t-:, 5!). 



58. SCOLIODON LONGURIO, (Jordan & Gilbert). 



Snout much produced, sharp, its length from mouth IJ times width of 

 mouth; labial folds well developed, that on upper jaw reaching about i 

 distance to middle of jaw, the lower fold i as long; upper teeth broadly 

 triangular, minutely serrated, serrulate on both margins ; lower teeth en- 

 tire, suberect, less oblique than in S. terrcc-novw. Pectorals short, not 

 reaching end of first dorsal; first dorsal large, close behind pectorals, its 

 base 2^ in interspace between dorsals ; second dorsal very small, over anal, 

 which is nearly twice its length; base of anal nearly } that of first dorsal. 

 Dark gray, the young with the fins dusky edged. Pacific Coast of Mexico ; 

 not rare, (longurio, a slender youth, or stripling.) 



Carcharias longurio, Jobdan & Gilbert. Proc. IT. S. Nat. Mus., 1882, lOG, Mazatlan. (Type, Nob. 

 28306, 28330, 28331, 29541, 29551.) 



