610 
ACTTNOPTERYGTT. 
Type. Imperfect fish. 
A very small species, attaining a length of about 0*08. Length 
of head with opercular apparatus contained four and a half times, 
maximum depth of trunk two and a half times in the total length 
to the base of the caudal fin. Abdominal vertebrae 9, caudal 
vertebrae 24 in number. Pectoral and pelvic fins present. Dorsal 
margin nearly straight in the middle, the fin comprising about 50 
to 55 rays ; anal fin with about 40 rays. Sqiiamation dense. 
The otoliths of this species are described by von IMeyer, loc. cit. 
1856. 
Form. Loc. Lower Pliocene : ^Yurtemberg. 
36179, 36578. Fine specimen in counterpart, displaying the 
characters noted in the specific diagnosis ; Unterkirchberg 
near Ulm. The vertebral centra are broken, and the 
edges of the median fins are imperfect. The characteristic 
haemapophyses of the abdominal vertebrae are shown, and 
one of the delicate pectoral fins, as also one of the 
small pelvic fins, is preserved. Purchased, 1861-62. 
36178. More imperfect large specimen; Unterkirchberg. 
Purchased, 1861. 
35749. Smaller specimen, with well-preserved caudal fin, which 
comprises 18 rays ; Unterkirchberg. Purchased, 1860. 
The two undermentioned imperfect specimens represent a form 
essentially identical with S. hirchhergana, but exhibiting a more 
arched hack and other minor differences which are considered to 
indicate a distinct species named S. antiqua by H. von Meyer, 
Palaeontogr. vol. ii. (1851), p 103, pi. xvii. figs. 4-7, and ihid. 
vol. vi. (1856), p. 26, pi. i. figs. 4, 5. 
P. 3972. Large distorted specimen ; Unterkirchberg. 
Ennislillen Coll. 
35520. Imperfect specimen wanting end of tail; Unterkirchberg. 
One of the otoliths is seen, and both pelvic fins are pre¬ 
served. Purchased,. 
Otoliths, apparently of this genus, not represented in the 
Collection, have also been described as follows:— 
Otolithus (Solea) approximatus, E. Koken, Zeitschr. deutsch. geol. 
Ges. vol. xliii. (1891), p. 106, pi. v. fig. 13.—Miocene; 
Langenfelde, Holstein. 
OtoJitlnis (Solece) glaher, E. Koken, loc. cit. vol. xl. (1888), p. 293, 
