520 
ACTINOPTERYGII. 
The following specimens of Aethcilion are not specifically deter¬ 
mined :— 
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P. 3656. A nearly complete, deeply fusiform fish, labelled “ Pachi- 
cormus latus ” by Miinster; Lithographic Stone, Kelheim. 
The specimen wants the extremity of the snout, but must 
have originally measured about 0*175 in length, whiJe 
the maximum depth of the trunk is 0*04. About 50 
vertebral centra can be counted. The dorsal fin shows 
16, and the anal fin 10 rays, the foremost support of the 
^J!^|dorsal being slightly fan-shaped and apparently composed 
$ (y^y of two rods meeting at an acute angle, with an intervening 
wing of bone. The pelvic fins arise opposite the anterior 
end of the dorsal, while the origin of the' anal is midway 
between the former and the caudal. Intermuscular bones 
are conspicuous both above and below the vertebral 
column as far as the middle of the caudal region. 
Enniskillen Coll. 
P. 3723. Hinder abdominal and caudal region of a similar fish; 
Kelheim. The supports of the dorsal fin exhibit small 
wfing-like expansions. Enniskillen Coll. 
P. 3728. Nearly complete fish 0*105 in length, of similar propor¬ 
tions but fractured across the middle; Kelheim. The 
axial skeleton and median fins are well exhibited. 
Enniskillen Coll. 
37S26. More slender fish 0*13 in length, resembling A. knorri , but 
with more remote pelvic fins; Solenhofen. 
Hdberlein Coll. 
37927. Slender fish about 0*105 in length, with similarly remote 
fins ; Solenhofen. Hdberlein Coll. 
37065. Pish 0*068 in length, in counterpart; Solenhofen. 
Hdberlein Coll. 
37056. Equally small fish, with remarkably advanced anal fin ; 
Solenhofen. MS. Hdberlein Coll. 
A fish from the Lithographic Stone (Lower Kimmeridgian), Cirin, 
Ain, France, now in the Palaeontological Museum, Munich, closely 
resembles A. angustus, and is provisionally named Aethalion affinis 
by A. Wagner, Gelehrte Anzeig. k. bay. Akad. Wiss. vol. 1. (1860), 
p. 405, and Abb. k. bay. Akad. Wiss., math.-phys. Cl. vol. ix. 
(1863), p. 730, footnote. u 0 fifi u / \ i . Q<1 9 \ 
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