322 
ACTINOPTERYGII. 
Genus HEXAPSEPHUS, Gunther. 
[Geol. Mag. (2) vol. iii. 1870, p. 439.] 
An extinct genus known only by the pbaryugeals and dentition 
Pharyngeal hone falciform, bearing a single series ot large, stou > 
conical or mammilliform teet h, few in number. 
Hexapsephus guentheri, sp. nov. 
1870. Ile.iapsephus sp., A. Gunther, loc.. cit. p. 439, pi. xvi. hg s - 
Type. Pharyngeal ; ISritish Museum. ()-026 
The type species, with pharyngeal attaining a length o ^ 
Only three large pharyngeal teeth in close series : foremost 0 
smallest, much laterally compressed ; middle tooth having cr ^^ r 
surmounted with two small longitudinal ridges, of which the o 
is divided by a notch into two tubercles ; hindcrmost tooth coni 
with apex excentric. , ra _ 
Form. <J* Loc. Freshwater Tertiary Formation : Padang, 8 U ® 
47534. Pharyngeal with dentition, the typo specimen dcscri 
and figured loc. cit. p. 439, pi. xvi. fig. 3; in earbonac 
shale. Presented by Herr 11. D. M. Verbee , 
47533,-35. 'two sots of pharyngeal teeth, one figured loc. 
pi. xvi. fig. 2 ; also four detached pharyngeal tec > 
two small slabs of carbonaceous shale with other e ^ 
Presented by Herr H. T). M. f erbee 
Several detached pharyngeal bones and teeth of Cyprinidffi . 
a freshwater Upper Tertiary formation in Idaho have been descr 
as follows j 
Diastichus maerodon, E. D. Cope, Proc. Ainer. Phil. Soc. vo j' ^ 
(1870), p. 539, and Proc. Acad. Nat. Sci. l’hila • 
p. 158. [Type species.] 
Diastichus parvidens , E. I). Cope, loc. cit. 1870, p. 040. 
Diastichus strangulalus, E. 1). Cope, loc. cit. 1883, p- 
Leucus condoniauus, E. I). Cope, loc. cit. 1883, p. 150. - g 
Leucus latus, E. D. Cope, loc. cit. 1883, p. 150. Anc i\l g 
latus, E. D. Cope, loc. cit. 1870, p. 543. | T>P e S P 
of so-called Anchybopsis.j 
Mylocyprinus infle.rus, E. D. Cope, loc. cit. 18S3, p. I 0 • y a( j. 
Mylocyprinus robustus, J. Leidy, Proc. Acad. Nat. feci. 
1870, p. 70, and Contrib. Extinct Vert. Fauna W . ^ 
(Rep. U.S. Geol. Surv. Territ. vol. i. 1873), P- -, g _ 
pi. xvii. figs. 11-17; E. D. Cope, loc. cit. 188 - , P ^ 
Includes M. Iciwji and M. longidens, E. D. Cope, o 
