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1884. Priscacara clivosa, E. D. Cope, ^ ert. Tert. Form. est, Book 1. 
p. 96, pi. xiii. fig. 3. 
Type. Imperfect fish; National Museum, Washington. 
More elongated than the type species, maximum depth of trunk 
contained somewhat more than twice in total length to base of 
caudal fin. Profile very steep in front of origin of dorsal fin. 
The specimens enumerated below as probably referable to this 
species, seem to exhibit 9 vertebrae in the abdominal, 15 in the 
caudal region. 
Form. Log. Eocene (Green River Shales): Twin Creek, W^yoming, 
E.S.A. 
P. 5928. Imperfect specimen apparently of this species, with incom¬ 
plete soft dorsal and anal fins. 
Presented hy T. A. Riclcarcl, Esp, 1889. 
P. 6187, P. 7494. Two fine specimens. Purchased, 1890, 1895. 
P. 7493. Two small specimens on one slab. Purchased, 1895. 
The following species have also been distinguished, but are not 
represented in the Collection :— 
Priscacara cypha, E. D. Cope, Bull. U.S. Geol. Surv. Territ. vol.iii. 
(1877), p. 817, and Vert. Tert. Eorm.W^est, Book I. (1884), 
p. 94, pi. xiii. fig. 2.—Eocene (Green River Shales); 
yVyoming, E.S.A. [^Imperfect fish; National Museun^, 
Washington.] 
Fa<Joe^ e^ y Prisc o^ra Hops, E. D. Cope, loc. cit. 18 / /, p. 818, and op>. cit. 
^ Priscacara oxyprion, E. B. Cope, Bull. E.S. Geol. Surv. Territ. 
vol. iv. (1878), p. 74, and op. cit. 1884, p. 94, pi. xiv. 
fig. 5.—Ibid. [Ditto.] 
Priscacara peadei, E. D. Cope, ioc. cit. 18/8, p. /5, and op. cit. 
1884, p. 96, pi. viii. fig. 4, pi. xiv. fig. 4.—Ibid. [Ditto.] 
Priscacara testudinama, E. D. Cope, op. cit. 1884, p. 98, pi. 
fig, 7.—Lower Eocene; Manti, Etah. [Portion of trun^ 
Remains apparently of the existing tropical American genus 
Acara have been recorded from a freshwater Tertiary Lignite at 
Taubate, in the Province of San Paulo, Brazil, by A. S. W oodward, . 
Rev. Mus. Paulista, vol. iii. (1898), p. 69. 
The marine family of Pomacexteid^, with skeleton not distin¬ 
guishable from that of the Chromidse, is supposed to be represented 
