76 
actinoptbrygii. 
p. 72, pi. V. figs. 18-20. Phareodus acutus, J. Leld} ' ! 
Proc. Acad. Nat. Sci. Philad. 1873, p. 99, and Contrib. 
Extinct Yert. Fauna W. Territ. (ltcp. U.S. Geol. Surv. 
Ter tit. vol. i. pt. i. 1873), p. 193, pi. xxxii. figs. 47-U- 
E. D. Cope, Ann. Rep. U.S. Geol. Surv. Territ. 187- 
(1873), p. 637 (in part). Fhareodon sericeus, E. P- Cope? 
ibid. (1873), p. 638 (palatino teeth).— Bridger Eocene; 
Wyoming, U.S. A. [Jaws. The type species of Phareodus-) 
Dapedoylossus encaustus, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
"vol. iii. 1877, p. 808, and op. cit. 1884, p. 70, pi. vi. fig- 
Osteoglossum encaustum , E. D. Cope, Ann. Rep. U.S. Geo . 
Surv. Territ. 1870 (1871), p. 430.— Eocene (Green Bive f 
Shales); Wyoming, U.S.A. [Portion of squamation.] 
Genus BRYCH5ITUS, novum. 
[** Agassis, Rep. Brit. Assoc. 1844 (1845), p. 308 (name only)-] 
Syn. Pomaphractus, L. Agassiz, Rep. Brit. Assoc. 1844 (1845), P- 307 
(name only). 
Platops, R. Owen, Catal. Foss. Rept. & Pisces Mus. Roy. c ° 11- 
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. Bnjchetus muelleri, L. Agassiz, Rep. Brit. Assoc. 1844, p. 308 
(name only). 
(?) 1845. Pomaphractus egertoni, L. Agassiz, ibid. p. 307 (name only)- 
[Portion of small skull ; British Museum.] 
( ) 1854. Platops subulidens, R. Owen, Catal. Foss. Rept. & Pisces 
Mus. Roy. 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. 
