MACB.0SEM1ID2E. 
185 
37099. A large fish, 0-18 in length, with imperfect head and fins, 
probably of this species ; Solenhofen. FLdberlein Coil. 
P. 5547. A small fish; Eichstadt. By exchange, 1888. 
Propterus elongatus, Wagner. 
1863. Propterus elongatus, A. Wagner, Abb. k. bay. Akad, Wiss., 
math.-phys. Cl. vol. ix. p. 645. 
Type. Eish, wanting squamation ; Palaeontological Museum, 
Munich. 
A species briefly described as differing only from P. speciosus in 
the more slender proportions of the trunk, which tapers more 
rapidly behind. 
Form. Loc. Lower Kimmeridgian (Lithographic Stone) : Ba¬ 
varia. 
Not represented in the Collection. 
Propterus scacchii (Costa). 
[Plate III. fig. 6.] 
1850. Rhynchoncodes seacchi, 0. G. Costa, Atti. Accad. Pontan. vol. v, 
p. 317, pi. v. fig. 5. 
Type. Nearly complete fish ; University Museum, Naples. 
The type species of the so-called genus Rhynchoncodes , of small 
size, attaining a length of about 0-06. Length of head with 
opercular apparatus exceeding the maximum depth of the trunk 
and contained about three-and-a-half times in the total length of 
the fish; the dorsal border gently arched and the maximum depth 
of the trunk about three times as great as the width of the caudal 
pedicle. Length of the first dorsal fin-ray nearly equalling the 
depth of the trunk at its point of insertion. 
Form, fy Loc. Upper Jurassic : Naples. 
P. 3613. Specimen 0-055 in length, displaying the general form of 
the fish but much abraded, shown of the natural size in 
PI. III. fig. 6 ; Torre d’Orlando, near Castellamare, 
Naples. Each part of the dorsal fin seems to have com¬ 
prised about 10 rays, and the anal fin, with only 6 rays, 
exhibits large fulcra along its anterior border resembling 
those of the caudal fin. FnnisJcillen Coll. 
To the genus Propterus , perhaps also to the species P. scacchii , 
may be referred two small imperfect fishes from the Upper Jurassic 
of Torre d’Orlando (errore “ Pietraroja ”) described under the name 
