168 UPPER CRETACEOUS TELEOSTS 
dorsally the parhypural contacts the centrum by a narrow connection, and anteriorly 
overlaps the haemal spine of the second preural vertebra. The parhypural is long, 
narrow and flattened. The two hypural bones support the lower caudal lobe, 
hypural 1 is the larger. Hypural 2 is narrow and does not extend dorsally to the 
mid-line of the fin. The second ural vertebra supports the four hypurals of the 
upper caudal lobe. These hypurals have partially united to form a hypural plate 
which does not extend ventrally to the mid-line of the fin. There is thus a distinct 
gap in the mid-line of the caudal skeleton between the upper and lower hypural 
elements. Long, narrow neural spines occur on preural vertebrae 3, 4 and 5. The 
neural spine of preural vertebra 2 is missing and the neural arch is considerably 
expanded. Two uroneurals are associated with the dorsal surface of the terminal 
vertebrae. The stegural is formed from the anteriorly expanded first uroneural, and 
it is drawn out postero-dorsally. At least two, and possibly three, epurals are 
associated with the dorsal edge of the stegural. 
The caudal fin has 19 principal rays, 17 of which are clearly branched. Nine 
accessory rays are present in front of the upper caudal lobe, and g below. The 
anteriormost accessory ray both above and below is slightly more flattened and more 
horizontally placed. This anterior ray may represent the remains of a fulcral scale. 
Scales. The entire body is covered with small cycloid scales which do not appear 
to show any ctenoid tendencies. Scales are also present on the cheek region but not 
on the opercular bones. 
eps 
n.a.pu2 epe hy6 
ga u2 
ileal SSS pul+ul 
AN S 
pu5 NS 
hs 
2mm ph 
Fic. 77. Pattersonichthys delicatus gen. et sp. nov. Caudal fin skeleton in lateral view. 
