352 
ACTIX0PTERYG1I. 
Genus EURYCORMUS, W agner. 
[Abh. k. bay. Akad. Wiss., matb.-phys. Cl. vol. ix. 1863, p. 707.] 
Syn. Eurypoma , T. H. Huxley, Figs. & Descript. Brit. Organic 
Remains, dec. xii. (Mem. Geol. Surv. 1866), p. 32. 
Trunk elongate-fusiform. External head-bones and opercular 
bones very feebly ornamented with rugae and tuberculations, all 
moderately robust: snout obtusely pointed, and maxilla laterally 
compressed, gradually deepened behind, with a convexly arched 
dentigerous border ; teeth small and arranged in a regular close 
series on the maxilla and splenial, similarly small and closely 
arranged on the other inner bones, comparatively large in the 
single series occupying the anterior half of the dentar}’ bone. 
Ossifications in the sheath of the notochord well developed, the 
hypoeentra and pleurocentra in part of the caudal region forming 
completed alternating rings; ossified ribs slender. Fulcra com¬ 
paratively small on the median fins [unknown on the paired fins’ 1 . 
Pectoral much exceeding the pelvic fins in size, but the latter well 
developed ; dorsal fin small and triangular, opposed to the pelvic 
pair ; anal fin with somewhat extended base ; caudal fin deeply 
forked. Scales delicate, smooth or very finely tuberculated, deeply 
overlapping, none much deeper than broad, and apparently none 
with peg-and-socket articulation. Lateral line inconspicuous. 
Eurycormus speciosus, Wagner. 
1863. Eurycormus spedosus, A. Wagner, Abh. k. bay. Akad. Wiss., 
matb.-phys. Cl. vol. ix. p. 709, pi. iv. 
1863. “ Eholidophorus obscurus , Munster, MS./’ A. Wagner, ibid. p. 659. 
[Imperfect axial skeleton; Palaeontological Museum, Munich.] 
1887. Eurycormus speciosus, K. A. von Zittel, Handle. Palreont. vol. iii. 
p. 230, fig. 242. 
Type. Nearly complete fish; Palaeontological Museum, Munich. 
The type species, attaining a length of about 0*35. Length of 
head with opercular apparatus about equal to the maximum depth 
of the trunk and occupying somewhat less than one-quarter of the 
total length of the fish : caudal pedicle less than half as deep as the 
abdominal region. External bones smooth. Pelvic fins arising far 
behind the middle point between the pectorals and the anal, opposite 
the origin of the dorsal, which occupies the middle of the back and 
comprises about 16 rays ; anal fin with about 17 rays, arising 
immediately behind the termination of the dorsal; length of each 
lobe of the caudal fin equalling three times the depth of the pedicle 
at its origin. 
