AMTIDiE. 
307 
P. 564. Type specimen, evidently owing tlie relatively great depth 
of the abdominal region to distortion ; Swanage. Some 
of the scales are well preserved in the dorsal part of the 
abdominal region. Egerton Coll. 
The following species have also been named and inadequately 
defined, but there are no examples in the Collection : — 
Megalurus altivelis , A. Wagner, Abh. k. bay. Akad. Wiss., math.- 
phys. Cl. vol. ix. (1863), p. 716,—Lower Kimmeridgian 
(Lithographic Stone) ; Bavaria. [Imperfect skeleton ; 
Palaeontological Museum, Munich.] 
Megcdurus idanicus , Y. Thiolliere, Ann. Sci. Phys. & Xat. Lyon, 
[2] vol. iii. (1850), p. 158, and Poiss. Loss. Bugey, pt. ii, 
(1873), p. 22.—Lower Kimmeridgian (Lithographic 
Stone); Cirin, Ain, France. [Imperfect fish : Lyons 
Museum.] 
Genus AMIA, Linnaeus. 
[Syst. Xat. ed. 12, 1766, p. 500. j 
Syn. Cgclurus, L. Agassiz, Poiss. Foss. vol. v. pt. i. 1844, p. 12. 
Notceus , L. Agassiz, ibid. 1844, p. 15. 
Trunk elongate and laterally compressed. Head large; supra- 
maxillary bone relatively large ; maxilla, premaxilla, palatine, and 
dentary with a single series of large conical teeth ; the complex 
splenial and other inner elements with minute teeth ; gular plate 
present. Vertebral centra completely ossified in the adult, short 
and biconcave, the hypocentra and pleurocentra forming distinct 
alternating discs in part of the caudal region; each neural arch 
articulating with two centra, and the abdominal vertebrae with 
prominent transverse processes ; ribs at least as long as the neural 
arches in the abdominal region. Fin-fulcra wanting. Dorsal fin 
much extended, occupying more than half the length of the back; 
anal fin small and short-based : caudal fin with convex hinder 
border. 
Amia valenciennesi (Agassiz). 
1839-44. Cgclurus vulenciennesii , L. Agassiz, Poiss. Foss. vol. v. pt. i. 
p. 12 ; pt. ii. p. 44, pi. liii. figs. 2, 3. 
1851. Amia , J. J. Heckel, Sitzungsb. k. Akad. Wiss., math.-naturw. 
Cl. vol. vi. p. 223. 
1858. Noteus laticaudus , M. de Serres ( errore ), Comptes Rendus, 
vol. xlvi. p. 751. 
