MACROSEMIIDiE. 
169 
P. 1077. Nearly complete trunk wanting the head; Kelheim. The 
dorsal fin is especially well preserved, and the squamation 
of the left side is shown from the inner aspect. 
Egerton Coll. 
P. 3599. Imperfect caudal region figured by Agassiz, loe. cit. 
pi. xxxviii. fig. 3 ; Kelheim. Enniskillen Coll , 
P. 3602. Small specimen wanting extremity of head and tail; 
Kelheim. Enniskillen Coll „ 
Ophiopsis guigardi, Thiolliere. 
1873. Ophiopsis guigardi , V. Thiolliere, Poiss. Foss. Bugey, pt. iL 
pi. vii. (fig. only). 
Type. Nearly complete fish ; Lyons Museum. 
A species attaining a length of about 0'3. Length of head with 
opercular apparatus equal to the maximum depth of the trunk and 
contained about five-and-a-half times in the total length of the 
fish; maximum depth of trunk twice as great as the depth of the 
caudal pedicle. Fin-fulcra slender, extending up the anterior ray 
of each median fin. Dorsal fin less than half as long as the back, 
much elevated in front, arising at the beginning of the second third 
of the trunk. Scales relatively large and smooth. 
Form, Log. Lower Kimmeridgian (Lithographic Stone): Cirin, 
Ain, France. 
Not represented in the Collection. 
Ophiopsis penicillata, Agassiz. 
1844. Ophiopsis penicillatus , L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
p. 290, pi. xxxvi. figs. 2-4. 
Type. Nearly complete fish; British Museum. 
A robust species of moderate size. Head with opercular appa¬ 
ratus occupying slightly less than one-quarter of the total length; 
maximum depth of trunk twice as great as the width of the caudal 
pedicle and contained five times in the total length. External head- 
bones conspicuously tuberculated ; teeth long and slender. Dorsal 
fin arising at the end of the anterior third of the back, half as long 
as the trunk, comprising not less than 25 rays, mostly bifurcated, 
of which the longest do not equal the depth of the trunk at their 
point of insertion; pelvic fins arising slightly in advance of the 
middle point between the pectorals and the caudal. 
The scales of this species are described by Agassiz as smooth and 
