416 
ACTINOPTERYGII. 
Family APHREDODERIDJ5. 
American freshwater fishes, essentially similar to the Berycidffi, 
hut with premaxillse not protractile, no distinct lateral line, and t he 
vent very far forward. Each pelvic bone forked. 
No extinct members of this familyare represented in the Collection, 
but the following genera and spocies have been described from 
American freshwater formations : — 
Arnphiplaga hrachyptera, E. D. Cope, Bull. U.S. Geol. Surv. 
Territ. vol. iii. (1877), p. 812, and Vert. Tert. Form. West, 
Book I. (ltep. U.S. Geol. Surv. Territ. vol. iii. 1884), 
p. 84, pi. xii.' fig. 4. — Eocene (Green River Shales) ; Twin 
Creek, Wyoming. [The typo 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. 1). 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, 1 roc ; 
Amer. Phil. Soc. vol. xi. (1870), p. 382.— Ibid. [Ditto.] 
Erismatopterus rieJcseckeri, E. D. Cope, loc. cit. 1870, p. 427, and 
op. cit. 1884, p. 81, pi. vi. fig. 2. — Ibid. [Tho type 
species. Ditto.] 
Triehophanes copei, Osborn, Scott, & Speir, Falroont. Rep. Prince- 
ton Sci. Exped. 1877 (1878), p. 98. — Lower Tertiary , 
Florissant, South Park, Colorado. 
Triehophanes foliarum, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
vol. iv. (1878), p. 73, and op. cit. 1884, p. 753, pi. li x - 
fig. 4. — Lower Tertiary ; Florissant, Colorado. [Imper- 
fect fish ; National Museum, Washington.] 
Triehophanes Mans, E. D. Cope, Proc. Amer. Phil. Soc. vol. xu - 
(1872), p. 480, and Ann. Rep. U.S. Geol. Surv. Territ. 
1872 (1873), p. 642, and op. cit. 1884, p. 753, ph 1 1X - 
fig. 3. — Lower Tertiary; Osino, Nevada. [The type 
species. Ditto.] 
The following genus, with two species, is supposed to represent 
an extinct family AsiNEorim®, closely related to the Aphredoderidm 
but having the pelvic bones not forked : — 
