64 
ACTIXOPTERYGII. 
The names of Semionotus bcilscimi , brevis , clubius, inermis, and 
trotti 1 are given by C. Bellotti (in A. Stoppani, Studii Geol. e Paleont, 
Lombardia, 1857, pp. 422-427) to fishes of uncertain affinities from 
the Upper Trias of Perledo, Como. Another unsatisfactorily deter¬ 
mined species is also named Semionotus bellotti , E. Btippell, in 
A. Stoppani, ibid. p. 425. 
It still remains to be proved that the so-called Archceosemionotus 
connectens (W. Deecke, Palseontogr. vol. xxxv. 1889, p. 121, pi. vi. 
fig. 3), from the Trias of Perledo, Como, is not founded on an 
imperfect example of Semionotus. The unique type specimen, in 
the Senckenberg Institute, Frankfort, has probably lost its squama- 
tion by accident. 
The imperfect trunk of a fish from the Upper Muschelkalk of the 
neighbourhood of Jena, apparently related to Semionotus and its 
allies, is named Dolichopterus volitans by G. Compter, Zeitschr. f. 
Haturw. vol. lxiv. (1891), p. 41, pi. i. figs. 1-6. It is described as 
characterized by much-enlarged pectoral fins, and by a compara¬ 
tively short dorsal opposed to an extended anal. xAnother imperfect 
fish, apparently of almost the same systematic position, from the 
Upper Muschelkalk of Elm, Brunswick, is described and figured 
without name by W. Dames, Palseont. Abhandl. vol. iv. (1888) r 
p. 173, pi. xvia. fig. 10. 
zrG e. nczlfiH 
Genus APHN^LEPIS, A. S. Woodward. 
0 ^ 
/>• 
[Described in forthcoming Mem. Geol. Surv. N. S. Wales, 
Palseont. no. 9.] 
Trunk laterally compressed and deeply fusiform. Head of mode¬ 
rate size with acuminate snout, and more or less ornamented with 
rugae and tubercles ; marginal teeth small, stout, and almost conical,, 
closely arranged : inner teeth nearly granular. Hotochord per¬ 
sistent, sometimes with small hypocentra and pleurocentra in the 
caudal region; ribs long. Fulcra conspicuous on all the fins. 
Pectoral fins of moderate size, somewhat larger than the pelvic pair, 
which are well developed; dorsal and anal fins acuminate and short- 
based, the former almost or completely in advance of the latter; 
caudal fin forked. Scales all rhombic, thin on the abdominal, still 
thinner on the caudal region ; those of the flank deeper than 
broad, those of the dorsal and ventral borders about as deep as 
broad; ridge-scales not enlarged. 
1 Described as Lepidotus trotti by Balsamo-Crivelli, Ann. Polytecn. Milano, 
May 1839. 
