438 
ACTIXOPTER YG IT. 
1833. Amblypterus lateralis , L. Agassiz, ibid. pp. 4, 39, pi. iv. figs. 1, 
7-9. [Strassburg Museum.] 
]8o7. Amblypterus latus , F. H. Troscliel, Verhandl. naturb. Verein. 
preuss. Rheinlande u. Westpbalens, p. 13, pi. ii. fig. 17. 
18/7. Amblypterus latus, R. H. Traquair, Quart. Journ. Geol. Soc. vol. 
xxxiii. p. 552, and Ganoid Fishes Brit. Carb. Form. (Pal. Soc.), 
pi. ii. fig. 1. 
1877. Amblypterus lateralis , R. H. Traquair, Quart. Journ. Geol. Soc. 
vol. xxxiii. p. 552. 
Type. Nearly complete fishes ; Strassburg Museum. 
The type species. Trunk regularly fusiform, the caudal pedicle 
being short and robust : dorsal contour much arched, and maximum 
depth in advance of the dorsal fin contained slightly more than three 
times in the total length. Head and opercular apparatus small, 
scarcely occupying one quarter of the total length ; external bones 
striated. Fins relatively large, the pelvic, pair smaller than the 
pectorals, arising midway between the latter and the anal: dorsal 
and anal fins longer than deep, the dorsal arising behind the middle 
point of the back, and the anal opposed to its hinder two thirds. 
Scales large and smooth, those of the middle of the flank not much 
deeper than broad. 
The sole differences between this species and the so-called A. 
latercihs seem to the present writer to be due to differences of age 
and the state of preservation. There are sparse striations upon the 
head-bones of all well-preserved specimens, and no constant 
difference in the proportions of the scales can be observed in the 
collection recorded below. 
Form, fy Log. Lower Permian : Rhenish Prussia. 
22658. Crushed remains of an adult individual, about 0*18 in length. 
in counterpart; Lebach. Purchased , 1848. 
22658 a. Well-preserved specimen, in counterpart, showing the 
subdivision of each series of scales at the base of the 
dorsal fin into two series ; Lebach. Purchased , 1848. 
29003. A fine example in counterpart, measuring O’16 from the 
extremity of the snout to the base of the upper caudal 
lobe ; Lebach. The squamation and portions of the fins 
are well shown. Purchased , 1859. 
P. 979, P. 3458. Two well-preserved specimens in counterpart, and 
the greater portion of a large individual with traces of 
. the fine dentition ; Lebach. 
Eger ton Enniskillen Colls. 
