M ACROSEM IID^E. 183 
Pefcalopteryx elegans ^BassaniJ, 
1879. Aphanepygus elegans, F. Bassani, Verhandl. k. k. geol. Reichs- 
anst. p. 163. 
1882. Aphanepygus elegcins, F. Bassani, Benksckr. k. Akad. Wiss., 
math.-naturw. Cl. vol. xlv. p. 197, pi. i. figs. 1-9. 
Type. Fish with imperfect fins; Austrian Geological Survey 
Museum, Vienna. 
The type species of the so-called genus Aphanepygus, attaining 
a length of about 012. Length of head with opercular apparatus 
exceeding the maximum depth and contained about five times in 
the total length of the fish to the base of the caudal fin. Tesserae 
on cheek very small, quadrangular and often antero-posteriorlv 
elongated. Dorsal fin comprising at least 75 rays, the longest of 
which are as deep as the maximum depth of the trunk; pelvic 
fins arising just beyond the end of the first quarter of the trunk. 
Scales small and irregular, smooth, not serrated on the posterior 
margin, and the majority broader than deep. (Bassani.) 
Form. Sp Loc. Upper Cretaceous: Island of Lesina, Dalmatia. 
Not represented in the Collection. 
Genus PROPTERUS, Agassiz. 
[Neues Jahrb. 1831, p. 386.] 
Syn. Phynchoncodes, 0. G. Costa, Atti Accad. Pontan. vol. v. 1850, 
p. 317. 
Trunk irregularly fusiform, the dorsal margin more or less bent 
at the origin of the dorsal fin ; head large, snout acute. Teeth long 
and slender. Notochord invested at least in part with very delicate 
pleurocentra and hypocentra or ring-vertebrae. Fins consisting of 
distally bifurcating rays; paired fins of moderate size, without 
fulcra; median fins very large, the dorsal extending more than 
half the length of the back and divided into two portions, the anal 
fin short and deep, and the caudal deeply forked; dorsal fin with 
basal fulcra, the anal and caudal fringed with fulcra. Scales 
covering the whole of the trunk, in regular series, united by peg- 
and-socket articulation, and usually pectinated or denticulated at 
the hinder border; the principal flank-scales somewhat deeper than 
broad, none of the ventral scales much broader than deep ; no en¬ 
larged ridge-scales. 
Propterus microstomus, Agassiz. 
1834. Propterus microstomus, L. Agassiz, Neues Jahrb. p. 386. 
1833-44. Notcigogus zieteni , L. Agassiz, Poiss. Foss. vol. ii. pt. i. 
