CTPRIXODONTID^. 
291 
of tlie trunk, which is contained about three and, a half times in 
the length to the base of the caudal fin. Vertebrae about 12 
in the abdominal, 20 in the caudal region. Dorsal fin with 9 
or 10 rays, arising immediately behind the origin of the anal fin, 
which comprises from 12 to 14- rays ; caudal fin truncated or 
very slightly forked. 
Form. Log. Lower Oligocene : Aix-en-Provence. 
P. 4286. Large slab of freshwater marl with shoal of fishes. 
Enniskillen Coll. 
20071. Small slab with similar shoal. 
Presented, hy S. P. Pratt, Esy., 1846. 
36131. Two similar small slabs. 
Presented hy Sir Podeinck I. Murchison, K.C.B., 1860. 
P. 1831. Two smaller slabs and one detached specimen. 
Egerton Coll. 
21396. Two small slabs. Purchased, 1847. 
43438. Small distorted fish. 
Presented hy Kenneth Murchison, Esq., 1872. 
21397. Two small distorted specimens. Purchased, 1847. 
Prolebias furcatus (Winkler). 
(?) 1832. Lehias perpusillus, L. Agassiz, Iseues Jahib. p. 135 (name 
only). 
(?) 1839. Lehias pei'pusillus, L. Agassiz, Poiss. Foss. vol. v. pt. ii. p. 49, 
pi. xli.'figs. 3-5. [Imperfect distorted fish; olim Lavater CoU.j 
1861. Lehias furcatus, T. C. WTnkler, Descript. Poiss. Foss. d'Oeningen 
(Xatuurk. Verhandl. Holland. Maatsch. [2] vol. xiv.), p. 44, pi. iv. 
fig. 15. 
(?)1874. Prolebias perpusillus, H. E. Sauvage, Bull. Soc. Hist, Xat. 
Toulouse, vol. viii. p. 194. 
1874. Prolebias furcatus, H. E. Sauvage, ibid. p. 190. 
Type. Imperfect fish ; British Museum. 
A very small species with distinctly forked caudal fin. Slightly 
more slender than the type species, but vertebral column and all 
fins except the caudal similar. 
Form. <^' Log. Upper Miocene : Oeningen, Baden. 
43784. Type specimen described and figured by Winkler, loc. cit. 
The stain on the matrix causes the pedicle of the tail to 
appear more slender than in realit 5 \ Van Breda Coll. 
r 2 
