PYCX0D0XTIDJE. 
283 
Pycnodus disparilis , J. Cornuel, Bull. Soc. Geol. France, [3] vol. v. 
(1877), p. 614, pi. xi. figs. 19, 20.—Neocomian : Massy, 
Haute Marne. [? Gyrodus .] 
Pycnodus heterodon , L. Didelot, Bull. Soc. Geol. France, [3] vol. iii. 
(1875), p. 254, pi. vi.—Middle Neocomian; near Aix-les- 
Bains, Savoy. 
Pycnodus heterotypus , J. Cornuel, Bull. Soc. Geol. France, [3] 
vol. v. (1877), p. 613, pi. xi. figs. 12-18.—Neocomian ; 
Massy and Yallerest, Haute Marne. 
Pycnodus irregularis , H. E. Sauvage (non Quenstedt), Bull. Soc. /- 
Sci. Nat. Tonne, vol. xxxiii. pt. ii. (1879), p. 44, pi. iI 
fig. 7.—Cenomanian ; Seignelay, Yonne, France. 
Pycnodus quaclratifer, J. Cornuel, Bull. Soc. Geol. France, [3] 
vol. v. (1877), p. 615, pi. xi. figs. 21, 22.—Neocomian; 
Massy, Haute Marne. 
Elliqjsodus incisus , J. Cornuel, ibid. p. 617, pi. xi. figs. 26, 27.— 
Upper Neocomian ; Massy. [Type of Ellipsodus, Cornuel.] 
Uranoplosus circtatus , E. D. Cope, Journ. Acad. Nat. Sci. Philad. 
[2] vol. ix. (1894), p. 445, pi. xx. fig. 8.—Lower Creta¬ 
ceous ; Oklahoma, U.S.A. 
TJranoplosus cotteaui, H. E. Sauvage, Bull. Soe. Sci. Nat. Yonne, 
vol. xxxiii. pt. ii. (1879), p. 47, pi. i. fig. 1. [Type of 
Uranoplosus , Sauvage.] 
Uranoplosus jlectidens, E. D. Cope, loc. cit. (1894), p. 446, pi. xx. 
fig. 9.—Lower Cretaceous; Oklahoma, L T .S.A. 
Other indeterminable Cretaceous teeth which seem to be Pycno- 
dont are also named as follows :— 
Ephcerocius crcissus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. (1833), 
p. 15, pt. ii. (1844), p. 212, pi. lxxiii. figs. 101-108. 
Figures by Faujas St. Fond, Hist. Nat. Mont. St.-Pierre, 
Maestricht (1799), pi. xix. figs. 3, 5.—Danian ; Maas¬ 
tricht, Holland. 
Sgrficeroclus mitrula, L. Agassiz, tom. cit. pt. ii. (1844), p. 214, 
pi. lxxiii. figs. 71-73 . —Greensand ; Regensburg, Bavaria. 
Sphcerodus tenuis, A. E. Beuss, Yerstein. bohm. Kreideform. pt. i. 
(1845), p. 9.—Planerkalk; Bohemia. 
The Cretaceous teeth commonly described under the provisional 
generic name of Ancistrodon (F. Boemer, ex Debey, MS., Kreideb'ild. 
Texas, 1852, p. 30) or Anlcistrodus (L. G. de Koninck, Bull. Acad. 
Boy. Sci. Belg. [2] vol. xxix. 1870, p. 77) are also probably for the 
mosUpart the prehensile teeth of Pycnodonts. Some of the Tertiary 
