168 
ACTINOPTEKYGII. 
caudal pedicle. Dorsal fin extending about half the length of the 
back; pelvic fins arising much nearer to the pectorals than to the 
caudal. Scales of moderate size, smooth and delicately serrated. 
A fish from the Lithographic Stone, described as intermediate 
between this species and 0. attenuate is named 0. intermedia by 
Wagner, loc. cit. p. 657. The type specimen is a well-preserved fish 
in the Palaeontological Museum, Munich. 
Form. Sf Loc. Lower Kimmeridgian (Lithographic Stone): Ba¬ 
varia. 
P. 7176. Fish 0*135 in length, much crushed, the dorsal fin and 
squamation shown only in impression; Eichstadt. Granu¬ 
lar teeth are exhibited apparently on the splenial and 
pterygoid bones; and about 12 branchiostegal rays are 
shown in series. The length of the pectoral fin-rays 
appears to be nearly equal to the depth of the back of the 
head. Purchased, 1894. 
Ophiopsis tenuiserrata (Agassiz). 
1844. Pholidophorus tenuiserratus, L. Agassiz (ex Minister, MS.), 
Poiss. Foss. vol. ii. pt. i. p. 276, pi. xxxviii. fig. 3, pi. xlii. fig. 4. 
1851. Ophiopsis serratus, A. Wagner, Abb. k. bay. Akad. Wiss., math.- 
phys. Cl. vol. vi. p. 62. [Imperfect fish ; Palaeontological Museum, 
Munich.] 
1863. Ophiopsis serrata, A. Wagner, ibid. vol. ix. p. 654. 
1881. Ophiopsis serrata , B. Vetter, Mittheil. k. mineral.-geol. Mus, 
Dresden, pt. iv. p. 55. 
Type. Imperfect fish; Woodvvardian Museum, Cambridge. 
A robust species, attaining a length of 0*18. Head with oper¬ 
cular apparatus occupying nearly one-fifth 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 of the fish. 
Fin-fulcra very slender, present on paired fins. Dorsal fin occupy¬ 
ing slightly less than half of the back and comprising 25 rays, 
mostly bifurcated, of which the anterior three are extremely elon¬ 
gated (their length exceeding the depth of the trunk) and the 
others rapidly become much shortened posteriorly; pelvic fins 
arising considerably in advance of the middle point between the 
pectorals and caudal. Scales smooth, those of the flank finely 
serrated and partly pectinated at the hinder margin, except towards 
the extremity of the caudal region. 
Form, Loc. Lower Kimmeridgian (Lithographic Stone) : Bar 
varia. 
