EUGXATHIDiE. 
315 
Genus ALLOLEPIDOTUS, Deecke. 
[Palgeontographica, vol. xxxv. 1889, p. 114.] 
Body robust and fusiform, and the atrophied upper caudal lobe 
conspicuous. External head- and opercular bones delicate, more or 
.less ornamented with rugae and tuberculations; snout obtusely 
pointed [maxilla straight?]. Ossifications in the notochordal 
sheath absent or very feeble. Fulcra biserial, relatively large. 
Pelvic fins small; dorsal and anal fins triangular in shape, the 
former arising opposite or immediately behind the pelvic fins; 
caudal fin moderately forked. Scales thick, mostly smooth, 
sometimes with serrations of the posterior border ; principal 
flank-scales in part deeper than broad, and none of the ventral 
scales much broader than deep; no enlarged series of dorsal ridge- 
scales. Lateral line inconspicuous. 
Allolepidotus rueppelli (Bellotti). 
1857. Pholidophorus ruppelii, C. Bellotti, in A. Stoppani, Geol. e 
Paleont. Lombardia, p. 428. 
1889. Allolepidotus ruppelii, W. Deecke, Palseontogr. vol. xxxv. p. 117, 
pi. vi. fig. 5. 
Type. Plaster cast of imperfect fish : Milan Museum. 
The type species, of small size, attaining a length of about 0*1. 
Length of head with opercular apparatus much less than the 
maximum depth of the trunk, and contained more than four times 
in the total length. External bones nearly smooth. Dorsal and 
anal fins deeper than long, the former larger than the latter and 
arising behind the pelvic fins. Some of the principal scales of the 
anterior series on the flank nearly twice as deep as broad, and 
those of other series also more or less deepened ; most of the scales 
of the abdominal region conspicuously serrated. 
Form, df Loc. Upper Trias : North Italy. 
The only known examples of this species were obtained from the 
black shales of Perledo, on the shore of the Lake of Como, between 
Yarenna and Begoledo. There are no specimens in the Collection. 
Allolepidotus nothosomoides, Deecke. 
1889. Allolepidotus nothosomoides, W. Deecke, Palaeontogr. vol. xxxv. 
p. 118, pi. vd. fig. 9. 
Type. Nearly complete fish. 
A more robust and somewhat larger species than the type. 
Length of head with opercular apparatus nearly equalling the 
maximum depth of the trunk and contained less than four times in 
