152 UPPER CRETACEOUS TELEOSTS 
associate with the haemal arches of caudal vertebrae 1 and 2. Both epineurals and 
epipleurals are associated with the first 23 vertebrae. 
Median fins and tail, The median fins are shown in the restoration, Text-figure 
68. The dorsal fin is short and deeper than long, positioned in the second quarter of 
the back. The fin has 12 rays, the first short and unbranched, the remainder 
longer and branched. All of the rays are segmented. The proximal radials are 
long and narrow except for the first which bears an expanded anterior keel. 
The anal fin is remote and is made up of 8 or g small feeble rays. The first ray 
appears to be unbranched whilst the remainder are branched. 
Fic. 69. Hemisaurida hakelensis sp. nov. Caudal fin skeleton in lateral view. 
The caudal skeleton (Text-fig. 69) consists of five vertebrae, although one of 
these would seem to be a compound vertebra. Three free preural vertebrae are 
present (Preurals 2, 3 and 4), all possessing expanded haemal and neural spines. 
Preural vertebra I appears to have fused with ural vertebra 1 and this compound 
vertebra supports the parhypural (haemal spine of preural 1), and two hypural 
elements, the first of which is the larger. The second ural vertebra is present as a 
terminal half-centrum associated with the hypurals to the upper lobe of the caudal 
fin. Two elongate, postero-dorsally directed, rod-like uroneurals are associated with 
the dorso-lateral regions of the compound centrum and the terminal half-centrum. 
One or two small epurals are present anterior to the uroneurals. 
