248 
ACTIi^OPTERYGII. 
insertion. Scales marked with radiating grooves on the hinder 
part of their inner face. 
Form. ^ Log. Upper Cretaceous: Westphalia. 
P. 1855. Pine specimen displaying all the fins ; Baumherg. 
Egerton Coll. 
P.1855 a. More imperfect specimen deepened by distortion; 
Baumherg. Egerton Coll. 
P. 3817. Two distorted specimens ; Baumherg. Enniskillen Coll. 
P. 9058. Three specimens, two being small; Baumherg. 
Purchased^ 1899. 
P. 1856. Slightly distorted fish with dorsal fin displaced forwards, 
and a larger imperfect specimen ; Sendenhorst. 
Egerton Coll. 
33058. Large trunk ; Sendenhorst. Purchased.^ 1858. 
%% 
The following species in the Cope Collection, from the Upper 
Cretaceous (Niobrara Group) of Dakota, U.S.A., have also been 
described, but are not represented in the Collection ;— 
Sardinius lineatus, E. D. Cope, Bull. U.S. Geol. Surv. vol. iv. J 
p78),p. 71. ^ !^ ^ 
Sardinius nasutulus.^ E. D. Cope, ihid. p. 70. | (^ ^ 
Sardinius percrassus, E. D. Cope, ihid. p. 72. ; f 
1 
The systematic position of the fish described as follows is quite 
uncertain;— . 
\, 
(V) Sardinius hlackhurnii, E. D. Cope, Amer. Nat. vol. xxv. (1891), * 
p. 654.—Lower Tertiary (?) ; Lee Hills, South Dakota, 
U.S.A. [Imperfect trunk.] / 
Genus DACTYLOPOGON, W. von der March. 
[Palseontogr. vol. xv. 1868, p. 278.] 
7 ' 
Head small, trunk elongated and much laterally compressed. 
Cranial roof and posterior cheek-plates ornamented with radiating 
rugae. Branchiostegal rays about 12 in number. Yertebrae ap¬ 
proximately 70 in number, about half being caudal ; the centra 
not longer than deep. Pectoral fins inserted close to the ventral 
border, the foremost ray much elongated and closely articulated 
but simple ; pelvic fins smaller than the pectorals ; dorsal and anal 
