100 
ACTINOPTEKYGII. 
Ichthyodectes ctenodon. Cope. 
1871. Ichthyodectes ctenodon, E. D. Cope, Proc. Amer. Phil. Soc. 
voL xi. p. 536. 
1872. Ichthyodectes ctenodon, E. D. Cope, ihid, vol. xii. p. 340. 
1875. Ichthyodectes ctenodon, E. D. Cope, Vert. Cret. Form. West 
(Rep. U.S. Geol. Siirv. Territ. vol. ii.), p. 207, pi. xlvi. figs. 1-4. 
1900. Ichthyodectes ctenodon, F. B. Loomis, Palseontogr. vol. xlvi.. 
p. 244, pi. xxiii. figs. 7, 8. 
Type. Associated maxillary and dentary bones, ko,.) 
The type species, with maxilla attaining a length of about O’16. 
Oral border of maxilla straight, with about 40 alveoli; that of 
dentary slightly concave, with nearly 30 alveoli. Depth of dentary 
at symphysis about one third the total length of the mandibular 
ramus. Teeth small, slender and smooth, with the apex turned a 
little inwards. 
Form. Log. Upper Cretaceous (Niobrara Group) : Smoky Hill, 
Kansas, U.S.A. 
Not represented in the Collection. 
Ichthyodectes anaides, Cope. 
1872. Ichthyodectes anaides, E. D. Cope, Proc. Amer. Phil. Soc. vol. xii. 
p. 339. 
1875. Ichthyodectes anaides, E. D. Cope, Vert. Cret. Form. West (Rep. 
U.S. Geol. Surv. Territ. vol. ii.), p. 206, pi. xliv. figs. 14, 15, 
pi. xlv. figs. 1-8. 
1892. Ichthyodectes anaides, A. R. Crook, Palaeontogr. vol. xxxix. 
p. Ill, pi. XV. 
1900. Ichthyodectes anaides, F. B. Loomis, Palteoutogr. vol. xlvi. 
^ 
Type. Remains of skeleton, including mandible and premaxiUa; / 
The largest known species, the mandible attaining a length of 
about 0-18. Oral border of dentary slightly sinuous, with two 
convexities, and not prominent at the symphysis; its depth at the 
symphysis about equal to one third the total length of the man¬ 
dibular ramus; its outer face gently sinuous, not sharply bent or 
ridged; teeth small and smooth but stout, with the apex curved 
inwards. Premaxilla a deep ovoid, very convex on the outer face, 
thinning laterally and above : teeth five in number, resembling 
those of the dentary. Maxilla a little deepened in front, and the 
oral border gently sinuous, with one median convexity ; its teeth 
smaller than those of the premaxilla, and the dental sockets about 
40 in number. 
Form. Log. Upper Cretaceous (Niobrara Group); Smoky Hil], 
Kansas. 
