BELOXORHYXCTIIDJE. 
9 
of the trunk, and contained five times in the total length of the 
fish. External head-bones ornamented with rugae and striae, the 
mandible being longitudinall}' striated. Pelvic fins arising midway 
between the pectoral arch and the anal fin ; dorsal fin at least as 
deep as long, arising considerably in advance of the anal fin, and 
smaller than the latter, which is elongated and comprises not less 
than 40 rays. Scales smooth, their hinder border conspicuously 
pectinated, except on the caudal region. 
Form. Sf Log. Upper Karoo Formation (Stormberg Beds) : Roux- 
ville, Orange Free State, South Africa. 
Not represented in the Collection. 
Family BELONORHYNCHIDiE. ^ >4 Stp, ^ 
Trunk elongated and slender ; tail abbreviate-diphycercal. Eead- 
bones well-developed, delicately ornamented withganoine, and these 
of the cranial roof forming a continuous shield, without a median 
longitudinal series of azygous elements ; snout much elongated and 
slender ; dentition consisting of well-spaced large conical teeth, with 
numerous intervening minute teeth; opercular apparatus reduced, 
without branchiostegal rays. Dorsal and anal fins single, remote ; 
fulcra minute or absent. Trunk wanting a continuous squamation, 
but exhibiting isolated longitudinal series of scutes. 
Only one definable genus of this family, BelonorTiynchus , has 
hitherto been discovered ; the fragments ascribed to Saurichthys and 
Browneichthys being too imperfect for satisfactory discussion. 
Genus BELONORHYNCHUS, Broun. 
[Neues Jahrb. 1858, p. 12.] 
Svn. SaurorhyncJms, G. von Minister {teste Broun, Nomencl.), in F. 
Braun, Verzeichn. Bayreuth befindl. Petrefact. 1840, p. 73 
(name only). 
Ichthyorhynchus, C. Bellotti, in A. Stoppani, Studii Geol. e 
Paleont. Lombardia, 1857, p. 436. 
Gijfonus, 0. G. Costa, Atti R. Accad. Sci. Napoli, vol. vi., 
Append. 1862, p. 26. 
Stylorhynchus , K. Martin, Zeitschr. deutsch. geol. Ges. vol. xxv. 
1873, p.725. 
Sauroj'liynchus, 0. M. Reis, Geogn. Jahresh. 1891 (1892), 
p. 145. 
Upper and lower jaws approximately equal in length, provided 
with few large conical teeth, and a close series of similar but smaller 
