420 
ACTINOPTERYGII. 
teeth at the dentary symphysis, and a single tooth at the proximal 
end of the presymphysial hone large, the principal mandibular teeth 
of the dentary bone numerous, well-spaced, regularly arranged, and 
of moderate size. Pelvic fins arisiug midway between the pectorals 
and the caudal; anal with about 20 rays, slightly nearer to the 
pelvic fins than to the caudal, and dorsal fin, with about 12 rays, 
directly opposed to its anterior portion. Scales almost smooth iu 
young individuals, coarsely though sparsely tuberculated and partly 
rugose in adults. 
The synonymy and characters of this species given above are 
chiefly based on the researches of Wagner and Vetter. The last- 
named author also points out that the rostrum of the fish attains its 
full development at an early stage, subsequently only increasing in 
thickness ; it thus appears relatively longer in the young than in 
the adult. One fine specimen from Eichstiidt in the Palaeontolo¬ 
gical Museum, Munich, only differs from the typical A. acutirostris 
in its somewhat blunter snout and is described under the specific 
name of A. obtusirostris by A. Wagner, Abh. k. bay. Akad. Wiss., 
math.-phys. Cl. vol. ix. (1863), p. 687. 
Form. <$f Loc. Lower Kimmeridgian (Lithographic Stone) : 
Bavaria. 
P. 7574. Scattered remains of a large fish about one metre in length, 
in counterpart; Solenhofen. Some of the head-bones, 
ring-vertebrae, and highly ornamented scales are well 
shown ; and the paired fins are preserved. 
37777. Similar fish with squamation less displaced, in counterpart ; 
Solenhofen. Presented by W. G. Neville , Esq ., 1863. 
P. 3808. An equally large fish, wanting the snout but with well- 
preserved caudal fin and remains of the dorsal, anal, and 
paired fins; Solenhofen. As in the two previous speci¬ 
mens, the vertebral axis of the caudal region is curiously 
displaced and thrown upwards beyond the limits of the 
continuous squamation. Enniskillen Coll. 
37791. Somewhat smaller specimen in a similar state of preserva¬ 
tion, but having the vertebral axis disjointed and wanting 
the greater part of the head; Solenhofen. 
Haberlein Coll. 
P. 972, P. 3807. Imperfect contorted fish at least 0*85 in length, 
showing some of the finely ornamented squamation, in 
counterpart: Solenhofen. Egerton § Enniskillen Colls. 
