428 
ACTINOPTERYGil. 
in the Palaeontological Museum, Munich (P. Bassani, Denkschr. k. 
Akad. Wiss., math.-naturw. Cl. vol. xlv. 1882, p. 264; K. A. von 
Zittel, Handb. Palaeont. vol. iii. 1887, p. 221). 
AspiclorTiynchus walchneri is another undefined name applied to 
fragments of the skull of Belonorhynchus from the Upper Lias of 
Baden and Wiirtemberg (L. Agassiz, Poiss. Loss. vol. ii.pt. i. 1833, 
p. 14; F. A. Quenstedt, Flozgeb. Wiirttemb. 1843, p. 244 (ed. 2, 
1851, p. 563), and Per Jura, 1858, p. 234). 
An indeterminable portion of skull and anterior vertebrae from 
the Cretaceous of Pietraroja, Benevento, now in the Geological 
Museum of the University of Naples, bears the name of Aspido- 
rhynchus platycephalus (0. G. Costa, Atti Accad. Pontan. vol. viii. 
1864, pp. 62, 193, p>l. ix. fig. 8; discussed by F. Bassani, Denkschr. 
k. Akad. Wiss., math.-naturw. Cl. vol. xlv. 1882, p. 231). The 
same specimen was previously described under the name of Dichelo- 
spondylus longirostris by 0. G. Costa, Ittiol. Foss. Ital. (1856), 
p. IS, pi. ii. fig. 8. 
Genus BELONOSTGMUS, Agassiz. 
[Neues Jahrb. 1834, p. 388.] 
Syn. Ophirachis , 0. G. Costa, Ittiol. Foss. Ital. 1856, p. 13. 
Snout very slender, scarcely, if at all, produced in front of the 
extremity of the much-elongated presymphysial bone ; cheek- 
plates robust, the postorbitals extending to the anterior border of 
the preoperculum; the conical teeth irregular in size, largest on 
the hinder part of the premaxillae and the median line of the pre¬ 
symphysial bone, obtuse on the splenial, and reduced to a fine 
granulation on the inner face of the ectopterygoid. Ossified vertebrae 
usually pierced by a remnant of the notochord. Fin-rays distally 
bifurcating ; fulcra wanting on paired fins, rare on median fins. 
Pelvic fins situated near the middle of the trunk ; dorsal and anal 
fins short-based, triangular, remote and opposed; caudal fin sym¬ 
metrically forked. Scales robust, smooth or rugose: in three 
deepened series on the flank of the abdominal region, and the series 
traversed by the lateral line the deepest; dorsal scales between the 
flank-scales and the median ridge in two series. 
Belonostonms sphyrsenoldes, Agassiz. 
1837. Belctnostomus sphyrcmoides, L. Agassiz, Berickt. Versamml. 
deutsch. Naturfi, Jena, 1836, p. 127 (name only). 
1837. Belanostomus brachysomus, L. Agassiz, ibid. p. 127 (name only). 
