416 
ACTING PTERYQII, 
Family APHREDODERID^. 
American freshwater fishes, essentially similar to the Berycidae, 
hut with premaxillae not protractile, no distinct lateral line, and the 
vent very far forward. Each pelvic bone forked. 
No extinct members of this family are represented in the Collection, 
hut the following genera and species have been described from 
American freshwater formations : — 
Ampliiplaga hrachyptera^ E. D. Cope, Bull. U.S. Geol. Surv. 
Territ. vol. hi. (1877), p. 812, and Vert. Tert.Eorm. West, 
Book I. (Rep. F.S. Geol. Surv. Territ. vol. hi. 1884), 
p. 84, pi. xii. fig. 4.—Eocene (Green River Shales) ; Twin 
Creek, Wyoming. [The type species. Imperfect trunk ; 
National Museum, Washington.] 
Erismatopterus endlichi, E. D. Cope, loc. cit. 1877, p. 811, and 
op. cit. 1884, p. 82, pi. xii. fig. 5.—Eocene (Green River 
Shales); Wyoming. [Imperfect fish; National Museum, 
Washington.] 
Erismatopterus levatus, E. D. Cope, Ann. Rep. U.S. Geol. Surv. 
Territ. 1870 (1871), p. 428, and op. cit. 1884, p. 80, 
pi. ix. figs. 6, 7. Cyprinodon levatus., E. D. Cope, Proc. 
Amer. Phil. Soc. vol. xi. (1870), p. 382.—Ibid. [Ditto.] 
Erismatopterus rickseckeri., E. D. Cope, loc. cit. 1870, p. 427, and 
oy. cit. 1884, p. 81, pi. vi. fig. 2.—Ibid. [The type 
species. 
Tricliophanes copei., Osborn, Scott, & Speir, Palseont. Rep. Prince¬ 
ton Sci. Exped. 1877 (1878), p. 98.—Lower Tertiary ; 
Florissant, South Park, Colorado. 
Tricliophanes foUarum, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
vol. iv. (1878), p. 73, and op. cit. 1884, p. 753, pi. lix. 
fig. 4.—Lower Tertiary; Florissant, Colorado. [Imper¬ 
fect fish ; National Museum, Washington.] 
Trichophanes Mans., E. D. Cope, Proc. Amer. Phil. Soc. vol. xii. 
(1872), p. 480, and Ann. Rep. U.S. Geol. Surv. Territ. 
1872 (1873), p. 642, and op. cit. 1884, p. 753, pi. lix. 
fig. 3.—Lower Tertiary; Osino, Nevada. [The type 
species. Ditto.] 
The following genus, with two species, is supposed to represent 
an extinct family Asineopid^, closely related to the Aphredoderidae 
but having the pelvic bones not forked;— 
