92 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
50.— 1 .ITHOL.EPIS Rafinesqiie. 
Alligator Gars. 
CJ tractosteus Rafiiiesque,' 1820. ) 
(Rafinesque, Amer. Month. Mag. iii, 447, 1818: tji^e Utholepis adamantinus Raf.) 
This geuus is scarcely distinct from Lepidosteus, differing only in the 
presence of a second series of large teeth in the upper jaw, along the 
outer margin of the palatine bones, at their junction with the premaxd- 
laries. Probably but one species, in the warmer parts of the United 
States, and southward to Cuba and Central America. {UOo^, stone; 
Ae-U, scale.) 
82. E. tU’islcecluMS (Bloch & Schneider) Jordan & Gilhert.—Allujator Gar. 
Color greenish, paler below, the adult usually not spotted. Snout 
usually not quite so long as the rest of the head, its least width con- 
tained 3^ times in its length. Head 3 J in length. D. 8 ; A. 8; V. 0 , 
Lat. 1. 60. Scales in an oblique series from the ventrals to middle ot 
back 18-20. L. 8-10 feet. Eivers of the Southern States, Cuba, Mex- 
ico, and Central America ; reaching a great size. 
(n Esox viridis Gmelin ed. Liun6, i, 1380: Esox tristcecims Schneider ed. Bloch 395: 
LeimoHtens spatula Lacdp. v, 333: Lepisosfeus or Atractosteus ferox • 
Oh. 73 : Lepidosteus manjuari Poey, M^m. Cuba, i, 273 : ? Atractosteus tropicus Gill, Proc. 
Acad. Nat. Sci. Phila. 1803.172: Lepidosteus viridis Gunther, viii, 329.) 
OffDEK J. HALECOMORPHI. 
{The Amias.) 
Parietals in contact. Pterotic, basis cranii, and anterior vertebrm 
simple. Mandible with opercular and coronoid. Maxillary not trans- 
versely segmented, bordering the mouth. Third superior pharyngeal 
lying on enlarged fourth. Upper basihyal wanting. Vertebrm amphi- 
coelian. Pectoral fins with mesopterygium and eight other elements. 
This order includes only the family of Arniidte. (I.atin lialecomorphus, 
formed like a shad; in allusion to the resemblance between this group of 
Ganoids and the IsospondylL) 
Family XXVIII.— AMIID.E. 
{The Mud-fishes.) 
Body oblong, compressed behind, terete anteriorly. Head subconical, 
anteriorly bluntish, slightly depressed, its superficial bones corrugated 
