76 
ACTINOPTERYGII. 
p. 7^, pi. V. figs. 18-20. Phareodus acutus, J. Leidy, />? rr 
Proc. Acad. Hat. Sei. Philad, 1873, p. 99, and Contrib. 
Extinct Yert. Eauna W. Territ. (Pep. U.S. Gcol. Surv. 
Territ. vol. i. pt. i. 1873), p. 193, pi. xxxii. figs. 47-51 ; 
E, D. Cope, Ann. Pep. E.S. Geol, Surv. Territ. 1872 
(1873), p. 637 (in part). Fhareodon sericeus^ E. D. Cope, 
ihid. (1873), p. 638 (palatine teeth).—Bridger Eocene; 
Wyoming, E.S.A. [Jaws. The type species of Pliareodus?\ 
Dajjedoglossus encaustus, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
vol. iii. 1877, p. 808, and op. cii. 1884, p. 70, pi. vi. fig. 1. 
Osteoglbssum encaustum^ E. D. Cope, Ann. Pep. U.S. Geol. 
Surv. Territ. 1870 (1871), p. 430.—Eocene (Green Piver 
Shales) ; Wyoming, U.S.A. [Portion of squamation.} 
Genus BRYCH.^TUS, novum, 
Agassiz, Pep. Brit. Assoc. 1844 (1845), p. 308 (name onl}’-).] 
Syn. Pomapliractus, L. Agassiz, Pep. Brit. Assoc. 1844 (1845), p. 307 
(name only). 
Platops, P. Owen, Catal. Foss. Pept. & Pisces Mus. Poy. Coll. 
Surgeons, 1854, p. 170 (undefined.) 
A genus known only by the head and anterior abdominal region, 
which are much laterally compressed. Cleft of mouth extending 
to a point somewhat behind the orbit, and the mandible not 
prominent; marginal teeth large, in very close series, with some¬ 
what tumid base and relatively short enamelled crown ; inner teeth 
comparatively minute and clustered, but all stout and conical. 
Preoperculum much expanded; branchiostegal rays not less than 
15 in number. Scales large and deeply imbricating, ornamented in 
their exposed portion with fine tubercles arranged more or less 
distinctly in radiating lines. 
Brychaetus muelleri, sp. nov. 
[Plate I.] 
1845. Brychetus muellerij L. Agassiz, Pep. Brit. Assoc. 1844, p. 308 
(name only). 
(?) 1845. Pomupliractus egertoni, L, Agassiz, ihid. p. 307 (name only). 
[Portion of small skull; British Museum.] 
(?)1854. Platops suhulidens^ P. Owen, Catal. Foss. Pept. & Pisces 
Mus. Poy. Coll. Surgeons, p. 170 (undefined). [Imperfect head; 
Royal College of Surgeons.] 
Type. Imperfect head ; British Museum. 
The type and only known species, not yet precisely definable. 
A 
