ON TEE GENUS " GONORRHYNCHUS " (GRONOVITJS). 
31 
which are without a supplemental bone. Jaws, vomer, palatines, 
and tongue, toothless. Opercular apparatus complete, the inter- 
opercle not enlarged. Dorsal and anal fins short, the latter below 
the middle of the dorso-caudal interspace ; no adipose fin ; caudal 
fin homocercal ; pectorals inserted on the lower half of the body ; 
ventral s well separated, opposite to or slightly in advance of the 
dorsal fin, Branchiostegals three or four. Frontal bones large, 
extending forward to above the mouth and backward to connect 
with the supraoccipital, which thus entirely separates the parietals ; 
basis cranii simple ; vertebra with strong parapophyses. 
The family, as at present constituted, consists of three genera, 
two of which are extinct. The more recent of these is Notogoneus 
Cope,* to which the following three species have been referred. 
N. osculus Cope,t from the Eocene Beds (Grreen River Shales) of 
Wyoming, from whence, also, it is instructive to note, come the 
ancestors of our " barramundi" (Osteoglossidce) and of our " rough- 
backed herrings" (Potamalosa and Hyperlophus); N. sq_uamosseus% 
from the Upper Eocene of Aix-en- Provence; and J$~. cuvieri§ from the 
Upper Eocene of Montmartre. One of the most interesting points 
in connection with these early Tertiary gonorhynchids is that they 
belonged to a fresh-water fauna, as is shown by the other fishes, the 
remains of which are associated with them in these formations. The 
second extinct genus is Charitosomns Marck||, with two, perhaps 
three, species — C. jbrinosus% from the Upper Cretaceous of 
Westphalia; O. hakdensis** from the Cretaceous of Mount Lebanon, 
* Notogoneus Cope, American Naturalist, xix, Nov. 1885, p. 1091 — id., Mem. 
Nat. Axacl. Sci. Washington, iii, pt. 1, 1884, p. 163. 
f Notogoneus osculus Cope, ibidd., pi., figg. 4 & 5 — Woodward, Proc. Zool. 
Soc., 1896, p. 501, pi. xviii, figg. 1 & 2. 
J Gyprinus squamosseus BlainviUe, Nouv. Diet. d'Hist. Nat., xxvii, 1818, 
p. 371 = Sphenolepis squamosseus Agassiz, Poiss. Foss., v., pt. 1, p. 13, pt. 2, p. 87, 
pi. xlv, 184:4:= Notogoneus squamosseus Woodward, ibid., p. 502, pi. xviii, figg. 3 
& 4. 
§ Sphenolepis cuvieri Agassiz, ibidd., pp. 13 & 89, pi. xliv, figg. 1 & 2.= 
Notogoneus cuvieri Woodward, ibid., p. 503. 
|| Charitosomus W. von der Marck, Fisch. Ober. Kreid. Westfalens, Palseontogr. , 
xxxi, p. 257, 1885. 
IT Charitosomus formosus Marck, ibid., pi. xxiv, fig. 1. 
** Spaniodon hakelensis Davis, Trans. Eoy. Dublin Soc. (2) iii, 1887, p. 591, pi. 
xxxiv., fig. A=(lharitosomus hakelensis Woodward, Ann. and Mag. Nat. Hist. 
(7) ii, 1898, p. 41 2. 
