FHOLlDOrHORIDJC. 
479 
Thoracopterus niederristi, Bronn. 
1858. Thoracopterus niederristi, H. G. Bronn, Neues Jahrb. p. 18, 
pi. iii. 
1866. Thoracopterus niederristi, R. Kner, Sitzungsb. k. Akad. Wiss., 
math.-naturw. Cl. vol. liii. pt. i. p. 170, pi. iii. 
Type. Imperfect fish ; counterpart in British Museum. 
The type species, attaining a length of about 0T1. Length of 
head with opercular apparatus probably exceeding the maximum 
depth of the trunk, and contained four times in the total length of 
the fish. External bones and postclavicular scales ornamented with 
close vermiculating rugae of ganoine ; mandibular teeth minute and 
stout. Pectoral fin-rays at least two-thirds as long as the trunk, 
the broad bases longitudinally striated; origin of dorsal fin three 
times as remote from the occiput as from the base of the caudal fin; 
anal much larger than the dorsal fin. Anterior dorsal scales rugose, 
these and the others of the flank of the abdominal region delicately 
crimped and serrated on the hinder margin; most of the caudal 
scales smooth and not serrated ; four series of deepened scales on 
the flank of the abdominal region. 
Form. Sf Loc. Upper Trias: Raibl, Carinthia. 
P. 1098. Counterpart of type specimen ; Raibl. The minute teeth 
are distinct in a fragment of the mandible ; the operculum 
is only shown by an imperfect impression of its inner face. 
There are no traces of the pelvic fins. Egerton Coll. 
Another imperfect fish from Raibl, very doubtfully distinct from 
Thoracopterus , but said to differ in wantiug the pelvic fins (only 
one specimen examined), is named Pterygopterus apus by R. Kner, 
Sitzungsb. k. Akad. Wiss., math.-naturw. Cl. vol. lv. pt. i. (1867), 
p. 722, with plate. The pectoral fins from the Upper Trias of 
Giffoni, Province of Salerno, Italy, erroneously referred to Urocomus 
picenus by 0. G. Costa, Atti R. Accad. Sci. Napoli, vol. vi. Append. 
(1862), p. 32, pi. v. fig. 2, are doubtfully ascribed to Ptery- 
gopterus by F.Bassani, Mem. Soc. Ital. Sci. [3] vol. ix. no. 3 (1892), 
p. 10. 
Genus PHOLIDOPLETJRUS, Bronn. 
[Neues Jahrb. 1858, p. 17.] 
Trunk elongate-fusiform and upper caudal lobe inconspicuous. 
External bones nearly or quite smooth, with very thin ganoine ; 
maxilla deepened behind, scarcely arched ; teeth minute. Vertebral 
