PETALODOSTID^. 
47 
1872. Petalodus destructor, 0. St John, Final Rep. U.S. Geol. Surv. 
Nebraska, p. 241, pi. iii. fig. 5. 
1873. Petalodus alleghaniemts, J. Leidy, Extinct Vert Fauna "West. 
Ten-it. (Rep. U.S. Geol. Surv. Territ, 1873), p. 312, pL xvii. fig. 3. 
1875. Petalodus alleghaniensis, J. S. Newberry, Rep. Geol. Surv. Ohio, 
vol. ii. pt. ii. p. 52, pi. Iviii. fig. 13. 
Type. Detaclied tooth. 
Crown of tooth acuminate, much projecting beyond the root an- 
teriorly. Lateral margin of the root sharply bent at one third tho 
distance from its tapering, but truncate, extremity. 
Torm. Loc. Coal-Measures : Pennsylvania, Ohio, Arkansas, 
Illinois, Nebraska, U.S. A. 
H. Trautschold ' has also recorded this species from the Carboni- 
ferous Limestone of Mjatschkowa, near Moscow; but the determi- 
nation is extremely doubtful. 
35678. Fine tooth from Turkey Creek, Conway Co., Arkansas. 
Purchased, 1859. 
P. 2981. Crown and portion of root ; La SaUe, Illinois. 
EnnishUlen CoU. 
Some abraded and fragmentary teeth (Nos. P. 4885, 4907, Pur- 
chased, 1885) from the Yoredale Hocks of Wensleydsde, Yorkshire, 
resemble the fossils described by J. W. Davis’* as Glyphanoclus 
tenuis. Upon present evidence, however, these cannot be distin- 
guished from worn fragments oi Petalodus. 
The following species, referable to Petalodus as here defined, have 
been founded upon detached teeth, but only three appear to be 
represented in the Collection : these are from the Enniskillen Col- 
lection, Nos. P. 2983 {P. parvulus'), P. 2980 {A. sulcatus), and 
P. 2984 {A. 2 >oUtus ) : — 
Petalodus curtus, Newberry & Worthen, Pal. Illinois, vol. iv. 
(1870), p. 355, pi. iii. fig. 2. — Keokuk Limestone ; Illinois. 
Petalodus hyhridus, St. John & "Worthen, Pal. Illinois, vol. vi. 
(18/5), p. 394, pi. xii. fig. 10. — St. Louis Limestone; 
Illinois. 
Petalodus hnajypi, J. S. Newberrj-, Ann. Rep. Geol. Surv. Indiana, 
1879, p. 345. — Keokuk Limestone ; Indiana. 
Petalodus linguifer, Newberry & M’orthen, op. cit. vol. ii. (1866), 
p. 3/, pi. ii. figs. 4, 5. — Chester Limestone; Illinois. 
Petalodus “ new variety,” W. J. Barkas, Monthly Rev. Dental 
> Nouv. M^m. Soc. Imp.Nat. Moscou, vol.iiv. 1879, p. 56, pi vii.flgs. 13,14 
= Trans. Eoy. Dublin Soc. [2] vol. i. (1883), p. 386, pi. xlix. figs. 24, 26; and 
Quart. Joum. Geol. Soc. vol xl. (1884), p. 621, pi xxvii. fig. 8. 
