I 1 2 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY iv. 



5O. LBTHOLEPIS Eaiinesque. 



AUiyiitor G'/-x. 

 (.ttnu-toxti UK K;iliuesque,<1820.) 



iir.-i|iir, AiiH-r. Month. M:i^. iii, 4-17, 1818: type Liiholt-pi* adamantinua Raf.) 

 This genus is scarcely distinct from Lepidostem, differing only in the 

 pre.M-nce of ;i second series of large teeth in the upper jaw, along the 

 outer mar-in of the palatine bones, at their junction with the premaxil- 

 larie>. J'robably but one species, in the wanner parts of the United 

 States. ;md southward to Cuba aud Central America. (tiUo~, stone; 

 /.-'::, scale.) 



82. li. Is'i%l'4'!nos (liloch &. Schiiricler) Jordan & Gilbert. Alllijator (iur. 



Cnliir -reenish, paler below, the adult usually not spotted. Snout 

 usually not quite so long as the rest of the bead, its least width con- 

 tained :\.\ times in its length. Head 3J in length. D. 8; A. 8; V.(}; 

 Lat. 1. (i(. Scales in an oblique series from the veutrals to middle of 

 back ix-i_'0. L. S-10 feet. Eivers of the Southern States, Cuba, Mex- 

 . and Central America; reaching a great size. 



i ' .'.' /.'MM- 1-iriilin (iiiidin ed. Liun<5, i, 13dO: Esox iristccchus Schneider eel. Blocli, H0.">: 

 I.i in: ..,.-/. nft ^jintula Lac('-p. v, '.\'.\'.\: Lrpisosteus or AtraatOttmu forox ICalinrstjiu', Iclith. 

 Oh. ?:5: I.i'fiitloMti n niaiijuan Poey, M6m. Cuba, i, 273: t Atractosicus troiricuy Gill, Proc. 

 Ai.nl. Nat. .Sci. 1'liila. Ido3, 17'^: Leyidosteua viridis Giiuther, viii, 329.) 



OBDEB J.-HALECOMORPHI. 



(The Annas.) 



1'aiielals in contact. J'terotic, basis cranii, and anterior vertebra' 

 simple. .Mandible \\ithopeivular and coronoid. Maxillary not trans- 

 \ei.M-l\ x --meiited, bordering the mouth. Third superior pliaryngeal 

 h ing on enlarged I'ourtli. ("pper basihyal wanting. Vertebras am phi- 

 cd Han. I'eetoral iins with mesopterygitun and eight other elements. 



This order includes only the family of A mil da. (Latin halrcoiiiorjtliitx, 

 1.. lined like a >liad; in allusion to the resemblance between this group of 

 and the 



FAMILY XXVIIL AMIID^E. 



(The 



I'.'d.\ oblong, mmpressrd behind, terete anteriorly. Read subconical, 

 anteriurly blnntish, slightly depressed, its supeiiicial bones corrugated 



