23 
of the pectoral fins, which may possibly he interpreted as infraclaviciilars. 
Moreover, there is not the slightest trace of ossification in the sheath of the 
notochord ; and Prof. Cope regards this character in Ganoids as a mark of 
very low degree.^ 
It is also generally admitted that the Triassic and Phjetic Scmrichthys 
is closely related to Belonorhij7icJius, being referable to the same family. 
Such being tlie case, the recent discovery of the maxilla of Saurichthys 
makes known another singular feature, hitherto only observed in one of the 
Crossojiterygian Ganoids (Bolypterus) , i.e., the presence of a considerable 
maxillary palatal extension.! 
BELONOPlIIYNCHUS, Broun, 1858. 
(Neues Jahrbucli, 1858, p. 7.) 
Ichthyorliynchus, C. Bellotti, in C. Stoppaui, Studii Geol. e Pal. Lombardia, 1857, p. 13G. 
Gen. Char. — Upper and lower jaws approximately equal in length, 
provided with few large conical teeth, and a close series of similar hut 
smaller teeth ; mandible very deep posteriorly. Head and opccular hones 
superficially ornamented with striations. Trunk with four longitudinal 
scries of dermal scutes, one dorsal and another ventral, and one smaller pair 
laterally placed, su 2 :»porting the “lateral line.” 
Belonoriiynchus gigas, sp. non. 
PL IX, Figs. 1, 2; PI. X, Figs. 1, 2. 
Ohs. — Seven specimens, in various states of preservation, exhibit all 
the most characteristic features of a large species of Belonorhynchus attaining 
a length of at least 0'19, and probably sometimes much more. The series 
comj)rises : — 
(«) A nearly complete fish with imjierfect fins, the 2 )cctorals being 
absent, the anal much broken, and the dorsal destroyed. This 
is the type-specimen and is shown of six-sevenths the natural 
size in PI. IX, Pig. 1. 
{h) Imjicrfect skull and mandible (PI. X, Pig. 1). 
{c) A smaller fragment of skull and mandible. 
* E. D. Cope, Review in Amer. Naturalist, 1887, p. 1018. 
t Smitli W'oodward, “ On a Maxilla of Saurichthys from tlie Rlisetic of Aust Cliff, near Bristol,” Ann. 
Mag. Nat. Hist., 1880, [6] Vol. iii, pp. 301, 303, PL xiv, figs. 7, 8. 
