166 
ACTIXOPTERYGII. 
peg-and-socket articulation, and often pectinated at the hinder 
border; the scales of the middle of the flank scarcely deeper than 
broad, few of the ventral scales much broader than deep; no 
enlarged ridge-scales. 
This is the least specialised genus ascribed to the Macrosemiidse, 
and may be regarded as a link between this family and that of the 
Eugnathidae. 
Ophiopsis procera, Agassiz. 
1844. Ophiopsis procerus, L. Agassiz, Poiss. Foss. vol. ii. pt. i. p. 289, 
pi. xlviii. fig. 1. 
1851. Ophiopsis procerus, A. Wagner, Abh. k. hay. Akad. Wiss.,math.- 
phys. Cl. vol. vi. p. 60. 
1863. Ophiopsis procera , A. Wagner, ibid. vol. ix. p. 653. 
Type. Imperfectly preserved fish; Palaeontological Museum, 
Munich. 
The type species, attaining a length of about 0-3. Length of 
head with opercular apparatus equalling the maximum depth of the 
trunk, and occupying about one-fifth of the total length of the fish ; 
maximum depth of trunk twice as great as the width of the caudal 
pedicle. External ornament of head and opercular bones consisting 
of small, sparse tuberculations ; teeth small. Dorsal fin occupying 
nearly half the length of the back, and comprising about 25 distally- 
bifurcated rays, of which the anterior are much elongated, while 
the others rapidly become much shortened; pelvic fins arising 
slightly in advance of the middle point between the pectorals and 
the caudal. Scales large and smooth, with delicately pectinated 
hinder border except towards the end of the caudal region. 
Form. Sf Log. Lower Kimmeridgian (Lithographic Stone): Ba¬ 
varia. 
37029. Full-sized specimen with imperfect head and fins, in counter¬ 
part ; Solenhofen. The tuberculation of the head and 
opercular bones and post clavicular plates is distinct; and 
the closely arranged, slightly constricted, smooth ring- 
vertebrae are well shown. The greater part of the 
squamation is also displayed. Hdberlein Coll. 
P. 6939. Another fine specimen 0*25 in length, displaying all the 
fins except the anal, and with well-preserved squamation ; 
Eichstadt. By exchange, 1893. 
