ENCHODONTIDJE. 
233 
The type species of the so-called Apateopholis, attaining a length 
of about 0-35. Length of head with opercular apparatus nearly 
equalling the length of the trunk from the pectoral arch to the base 
ot the caudal fin ; maximum depth of trunk contained four times 
in the same measurement. Pelvic fins arising just behind the 
middle point of the trunk, opposite the hinder part of the dorsal 
fin, which comprises about 20 rays and is almost completely within 
the hinder half of the trunk; anal fin comparatively low and 
extended, with about 17 rays, arising nearer to the pelvic pair than 
to the caudal fin. Lateral dermal scutes very thin, between 40 
and 50 in number, and the largest about four or five times as deep 
as broad, ornamented with extremely delicate concentric ridges, 
sometimes subdivided into tubercles, following the lines of growth ; 
the hinder margin not pectinated, but notched by the lateral line. 
Form. <$,• Loc. Upper Cretaceous: Mt. Lebanon. 
P- 4745. Type specimen described and figured by Davis, loc. cit. 
p.' 612, pi. xxxvii. fig. 1, and further noticed in Proc. 
Zool. Soc. 1890, p. 634; Hakel. Some scutes are 
displaced dorsally in the abdominal region, and the 
ornament of one is well displayed. 
P- 4026. Fish about 0'18 in length ; Hakel. 
P- 4870. Still smaller specimen, wanting the 
snout and tail ; Hakel. 
Lewis Coll. 
extremity of the 
Lewis Coll. 
P- 4869. Head of large specimen noticod by Davis, loc. cit. p. 614, 
described and figured in Proc. Zool. Soc. 1890 , p. 035 , 
pi. lv. fig. 11 ; Hakel. Lewi * Co ' L 
39237. Imperfect caudal region of large specimen ; probably from 
Hakel. There seem to be remains of a thickened scute 
of undetermined form on the caudal pedicle. 
Tristram Coll. 
Genus LEPTECODON, WiUiston. 
[Kansas Univ. Quart. (A) vol. viii. 1899, p. 113.] 
As Prionolepis, but with an additional series of scutes on the 
flank above and below those of the lateral line. 
Leptecodon rectus, IV illiston. 
1899. Leptecodon rectus, S. W. Williston, loc. cit. p. 113, pi. xxvi. 
type. Imperfect fish ; Kansas University Museum. 
