ASPIDORHYXCHI.D J2. 
431 
Belonostomus kochi, Agassiz. 
1834. Aspidorhynchus Upturns, L. Agassiz, Verhandl. Ges. vaterland. 
Mus. Bdhrnen, p. 70 (name only). 
1844. Aspidorhynchus lepturus , L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 
p. 139 (undefined). 
1844. Belonostomus kochii, L. Agassiz, ibid. p. 143. 
1863. Belonostomus kochii, A. Wagner, Abb. k. bay. Akad. Wiss., 
matli.-pbys. Cl. vol. ix. p. 689. 
Type. Nearly complete fish ; Palseontological Museum, Munich. 
A species closely related to B. muensteri , but less elongated and of 
more delicate proportions ; head with opercular apparatus occupying 
one-quarter of the total length. Jaws equal in length. 
An immature example apparently of this species in the Palaeon¬ 
tological Museum, Munich, is labelled B. longimcinus by Munster. 
Form. Sf Loc. Lower Ximmeridgian : Bavaria. 
49136. Plaster cast of type specimen 0*275 in length ; Lithographic 
Stone, Kelheim. Purchased , 1878. 
Belonostomus tenuirostris, Agassiz. 
[Plate XVII. fig. 12.] 
1833. Aspidorhynchus tenuirostris, L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
p. 14. 
1834. Belonostomus tenuirostris , L. Agassiz, Neues Jahrb. p. 388. 
1837. Belonostomus tenuirostris, L.Agassiz, Bericht.Versamml. dentsch. 
Naturf., Jena, 1836, p. 127. 
1837. Belonostomus tabulatus, L. Agassiz, ibid. p. 127 (name only). 
1844. Belonostomus tenuirostris, L. Agassiz, Poiss. Foss. vol. ii. pt. ii. 
pp. 143, 297. 
1844. Belonostomus subulatus, L. Agassiz, ibid. pp. 143, 297. [Imper¬ 
fect anterior half of fish ; Palaeontological Museum, Munich.] 
1863. Belonostomus tenuirostris, A. Wagner, Abh. k. bay. Akad.Wiss., 
math.-phys. Cl. vol. ix. p. 691. 
1863. Belonostomus tenuirostris, var. brevivertebralis, A. Wagner, ibid. 
p. 691. 
1881. Belonostomus tenuirostris, B. Vetter, Mittheil. k. mineral.-geol. 
Mus. Dresden, pt. iv. p. 85. 
Type. Head, &c.; unknown. 
A species of very slender proportions attaining a length of about 
0*3. Head with opercular apparatus occupying one-third of the 
total length; maximum depth of trunk contained fourteen times in 
the total length. Cranium about nine times as long as its maximum 
depth, having the snout excessively elongated, and projecting to 
