MACROSEMIIDiE. 
171 
Ophiopsis dorsalis, Agassiz. 
1844. Ophiopsis dorsalis , L. Agassiz, Poiss. Poss. vol. ii. pt. i. p. 291, 
pi. xxxvi. fig. 5. 
Type. Nearly complete fish; British Museum. 
A much elongated species, attaining a length of 0*16. Head 
with opercular apparatus occupying one-fifth of the total length; 
maximum depth of trunk twice as great as the width of the caudal 
pedicle, and contained somewhat more than six times in the total 
length. Head and opercular hones externally rugose. Dorsal fin 
comprising not less than 35 rays and occupying the greater part of 
the back, not so deep as the trunk at its point of origin; pelvic 
fins arising slightly in advance of the middle point between the 
pectorals and caudal. Scales smooth and somewhat concave exter¬ 
nally, those of the flank finely serrated on the hinder border, those 
of the caudal region often irregularly punctated. 
Form. <$f Log. Purbeck Beds : Dorsetshire. 
P. 466. Type specimen ; probably from Swanage, erroneously 
described by Agassiz as from the Lower Oolite of North¬ 
ampton. Egerton Coll . 
P. 7496. A more imperfectly preserved specimen, in counterpart; 
Swanage. Purchased, 
Ophiopsis flesheri (Agassiz). 
1844. Pholidophorus jlesherii , L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
p. 281, pi. xxxvii. fig. 8. 
1887. Ophiopsis flesheri , K. A. von Zittel, Handb. Palseont. vol. iii. 
p. 217. 
Type. Nearly complete fish ; imperfect counterpart in British 
Museum. (FT. /V. H. A/, 
A much elongated species, attaining a length of 02. Head with 
opercular apparatus occupying one-fifth of the total length; maxi¬ 
mum depth of trunk twice as great as the width of the caudal 
pedicle, and contained seven times in the total length. Dorsal fin 
occupying about half the length of the back, and apparently much 
elevated in front; pelvic fins arising slightly in advance of the 
middle point between the pectorals and caudal. [Scales apparently 
serrated.] 
Form. Sp Log. Inferior Oolite: Northamptonshire. 
47138. Portion of counterpart of the type specimen, extending 
from the back of the head to the middle of the caudal 
region; from the railway-tunnel near Blisworth. The 
