296 
ACTINOPTERYGII. 
P. 287. Slab with numerous specimens, mostly immature ; ’ 
Crete. Transferred from Alus. Tract. Geology , 1 
The following specimen may bo a Cyprinodont, but is 110 
generically determinable 
42783. lype specimen of Lebias crassus, described and figured by 
d. C. Winkler, Descript. Poiss. Foss. d’Oeningen (Natuur 
Verhandl. Holland. Maatsch. [2] vol. xiv. 1861), P- 
pl. iv. fig. 1,3 ; Upper Miocene, Oeningen, Baden. ’ 
ferred to Prolebias by H. E. Sauvage, Bull. Soc. Hist. 
Toulouse, vol. viii. (1874), p. 190. Van Breda Oo ■ 
The following imperfectly defined genus and 
represented in tho Collection, is also reforred to 
by Sauvago: — 
Pcecilops breviceps, A. Pomel, Catal. Method. Yert. Foss. Ij® 
(1853), p. 135; H. E. Sauvage, Bull. Soc. Hist. ^ 
Toulouse, vol. viii. (1874), p. 195 (Pcecilops).— 
Miocene (Lignite) ; Menat, Puy-do-D6me. 
A comparatively large skull from the Lower Pliocene, Siwa ' 
Hills, India, now in the Dublin Museum, is provisionally re ei ^ 
to a Cyprinodont by 11. Lydckker, Paleeont. Indica, ser. x. vo • 1 
(1886), p. 256, woodc. .sibly 
The following genera and species, regarded by Cope as P 0 *- 81 ^ 
Cyprinodont, are too imperfectly known for systematic c 
mination : — 
Gephyrura concentrica, E. D. Cope, Amcr. Nat. vol. xxv. (1®® ’ 
p. 654. — Lower Tertiary (?) ; Bee Hills, South D a '° 
IJ.S.A. [Imperfect fish.] _ rTVtto.] 
Proballostomus longulus, E. D. Cope, ibid. p. 655. — Ibid. L 
Suborder Y. OSTAIUOPHYSI. 
Vertebral contra always complete constricted cylinders, a 
anterior vertebras usually coalesced and fused with the 0CC '^ U j ( ’j c r 
chain of small bones (weberian ossicles) connecting the a * r " & 
with the auditory organs. Mandible simple, each ramus consls . 
only of two elements (dentary and articulo-augular). Pectora ^ 
suspended from tho cranium ; prccoracoid arch present ! P ec 
n with not more than four or five basals. Pelvic fins a ’ 0 J'' 
In the living forms— air-bladder, if well developed, connectc 
species, which is not; 
the Cyprinodontid® 
