ASPIDORHYNCHIDJE. 
419 
Aspidorhynchus acutirostris (Blainville). 
1755. Figures by G. W. Knorr, Samrnl. Merkwiirdigk. Natur, pt. i. 
p. 38, pis. xxiii., xxix. fig. 1. 
1818. Esox acutirostris, H. D. de Blainville, Nouv. Diet. d’Hist. Nat. 
vol. xx\’ii. p. 332. 
1823. Esox acutirostris, J. F. Kruger, Gescbichte der Urwelt, vol. ii. 
p. 665. 
1833. Aspidorhynchus acutirostris, L. Agassiz, Neues Jabrb. p. 478, 
and Poiss. Foss. vol. ii. pt. i. p. 14. 
1842. Aspidorhynchus longissimus, G. von Munster, Neues Jahrb. p. 44. 
[Nearly complete fisb; Palaeontological Museum, Munich.] 
1844. Aspidorhynchus acutirostris, L. Agassiz, Poiss. Foss. vol. ii. 
pt. ii. p. 136, pi. xlvi. 
1844. Aspidorhynchus speciosus, L. Agassiz, ibid. p. 137, pi. xlv. 
[Imperfect trunk; Palaeontological Museum, Munich.] 
1842-44. Aspidorhynchus ornatissimus, L. Agassiz, ibid. p. 138, pi. xlvii. 
[Portion of fish; Palaeontological Museum, Munich, and Wood- 
wardian Museum, Cambridge.] 
1844. Aspidorhynchus mandibularis, L. Agassiz, ibid. p. 138. 
1861. Belonostomus microcephalus, T. C. Winkler, Descript. Poiss. 
Foss. Solenhofen (Natuurk. Yerhandl. Holland. Maatsch. [2] 
vol. xiv.), p. 26, fig. 4. 
1863. Aspidorhynchus acutirostris, A. Wagner, Abh. k. bay. Akad. 
Wiss., math.-phys. Cl. vol. ix. p. 680. 
1863. Aspidorhynchus mandibularis, A. Wagner, ibid. p. 684. 
1871. Aspidorhynchus ornatissimus, T. C. Winkler, Arckiv. Mus. Teyler, 
vol. iii. p. 183, pi. v. figs. 11, 12. 
1881. Aspidorhynchus acutirostris, B. Vetter, Mittheil. k. mineral.-geol. 
Mus. Dresden, pt. iv. p. 83. 
1887. Aspidorhynchus acutirostris, K. A. von Zittel, Handb. Palaeont. 
vol. iii. p. 220, figs. 233, 234. 
1887. Aspidorhynchus, 0. Reis, Sitzungsb. k. bay. Akad. W T iss., math.- 
phys. Cl. vol. xvii. p. 151, pi. i. figs. 1-3, 6, 7, pi. ii. figs. 1-4, 7. 
Type. Nearly complete fish ; Paris Museum of Natural History. 
The type species, of large size, attaining a length of 1 metre. 
Head with opercular apparatus occupying somewhat less than one- 
quarter of the total length ; maximum depth of trunk contained 
between nine and ten times in the total length. Cranium rapidly 
tapering to the acute rostrum, which projects in advance of the 
mandible to an extent at least equal to one-third of the total length 
of the cranium ; cranial bones and operculum ornamented with 
granulations and short longitudinal rugae, the latter especially con¬ 
spicuous on the rostrum; preoperculum with radiating ridges at 
the angle; mandible and branchiostegal apparatus almost smooth ; 
presymphysial bone rapidly tapering, twice as long as its maximum 
depth ; upper laniary teeth at the base of the rostrum, one or two 
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