POLYODONTIDiE. 
47 
Crossopholis magnicaudatus, Cope. 
1883. Crassopholis magnicaudcitus, E. D. Cope, Amer. Nat. vol. xvii. 
p. 1153. 
1885. Crossopholis magnicaudatus, E. D. Cope, ibid. vol. xix. p. 1090. 
1886. Crossopholis magnicaudatus , E. D. Cope, Mem. National Acad. 
Sci. vol. iii. p. 161, pi. with. figs. 1-3. 
Type. Portion of trunk^ Pi 
The type species, with rostrum relatively shorter than in Polyodon 
folium , and the operculum larger. Bases of the teeth round and 
closely apposed. Dorsal fin-supports 16-18 in number, and rays 
probably 24. Scales subquadrate and more widely separated 
anterior to the dorsal fin than posterior to it. 
Measurements of type specimen:—Length from notch of caudal 
fin to line of origin of dorsal, 0*17 ; depth at origin of anal, 0-06; 
depth of caudal pedicle, 0*035; length of inferior caudal lobe, 0*11; 
depth and diameter of scales about 0*001 {Cope). 
Form. $ Log. Eocene : Wyoming, U.S.A. 
Not represented in the Collection. 
Genus PHOLIDURUS, A. S. Woodward. 
*Jr/ 
[Proc. Geol. Assoc, vol. xi. 1889, p. 31.] y/e^g 
A provisional name applied to a Cretaceous Chondrostean fish 
known only by a portion of the tail. The caudal fulcral scales 
much resemble those of Psephurus, but are broader and flatter, less 
pointed, and evidently indicate a stout depressed fish. The caudal 
fin-rays are ornamented with ganoine. 
Pholidurus disjectus, A. S. Woodward. 
1889. Pholidurus disjectus , A. S. Woodward, Proc. Geol. Assoc, vol. xi. 
p. 31, pi. i. figs. 4, 5. 
Type. Portion of tail; British Museum. 
The type species, known only by the fragment mentioned below. 
Caudal fulcral scales very flat, with rounded and obtuse apex; 
their exposed surface ornamented with thick ganoine in irregular 
dots and short wavy lines, more or less clustered, especially near 
the margin. Caudal fin-rays very robust, the superficial ganoine 
thick and rugose, not always completely covering the exposed faces 
of the successive joints. 
It is still uncertain whether or not the portion of a depressed 
rostrum described, loc. cit. p. 31, pi. i. fig. 6, belongs to this fish. 
Having made a renewed examination of the Jurassic Coelacanths at 
