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ACT IN OPTEHYGrll. 
A form of Eurylepis, apparently distinguished from 2£. granulata 
merely by the extension of the scale-ornament over the caudal 
region, is named E. ornatissima, J. S. Newberr} 7 , Rep. Geol. Surv. 
Ohio, vol. i. pt. ii. (1873), p. 352, pi. xxxix. fig. 4 ( = Mecolepis 
ornatissimus, J. S. Newberry, Proc. Acad. Nat. Sci. Philad. vol. viii. 
1856, p. 97). Three other species are also determined as enume¬ 
rated below, the type specimens being nearly complete fishes in 
the Museum of Columbia College, New York :— 
Eurylepis corrugata, J. S. Newberry, Rep. Geol. Surv. Ohio, 
vol. i. pt. ii. (1873), p. 350, pi. xxxviii. fig. 4 : Mecolepis 
corrugatus, J. S. Newberry, Proc. Acad. Nat. Sci. Philad. 
vol. viii. 1856, p. 96 (adopted as type of Mecolepis). 
.Eurylepis (?) lineata, J. S. Newberry, ibid. 1873, p. 353, pi. 
/Yf /7 /rey^xxxix. fig. 7: Mecolepis lineatus, J. S. Newberry, ibid, 
h 1856, p. 97: Ehadinichthys (?) lineatus, J. S. Newberry, 
, q Ar b Palseoz. Pishes N. America (Mon. IT. S. Geol. Surv. no. xvi. 
^ • 1889), p. 228. 
Eurylepis striolata, J. S. Newberry, tom. cit. 1873, p. 35o. 
The small fish from the Coal-Measures of Linton, Ohio, named 
Mecolepis serratus , J. S. Newberry (Proc. Acad. Nat. Sci. Philad. 
vol. viii. 1856, p. 97), does not appear to have been mentioned 
since the original notice. 
The following specimens appear to the present writer to be 
specifically indeterminable immature individuals :— 
P. 998. Two small fishes of the form named Eurylepis ovoidea 1 , 
from Linton. Egerton Coll. 
, , z 
pA V 
P. 1006. Three small fishes of the form named Eurylepis minima 2 , 
from Linton. Egerton Coll. 
P. 3451. Pour similar specimens. Enniskillen Coll. 
Another genus of stout proportions, with nearly vertical sus- 
pensorium, now assigned to the Palseoniscidse, is Benedenichtliys , 
R. PL Traquair (Ann. Mag. Nat. Hist. [6] vol. vi. 1890, p. 492), 
originally defined under the pre-occupied name of Benedenius 
(Traquair, in L. G. de Koninck, Faune Calc. Carb. Belg. pt. i. 187b, 
1 J. S. Newberry, Rep. Geol. Surv. Ohio, vol. i. pt. ii. (1873), p. 351, pi. 
xxxix. fig. 1 : Mecolepis, ovoideus, J. S. Newberry, Proc. Acad. Nat. Sci. Philad. 
vol. viii. 1856, p. 97. 
2 J. S. Newberry, ibid. 1873, p. 353, pi. xxxix. fig. 3. 
