f 
C■ 
PALZEOXTSCIDa-:. 
501 
Elonichthys browni , E. H. Traquair, Quart. Journ. Geol. Soc. 
vol. xxxiii. (1877), p. 553: Palceoniscus (. Elonichthys ) 
brownii, J.AV. Dawson, Canadian Nat. n. s. vol. viii. (1877), 
p. 339, and Acadian Geology, Suppl. (1878), p. 101 : 
Palceoniscus brownii, C. T. Jackson, Eep. Albert Coal 
Mine (1851), p. 22, pi. i. fig. 2, and Proc. Boston Soc. 
Nat. Hist. vol. iv. (1852), p. 139.—Lower Carboniferous; 
Hillsborough, Albert Co., New Brunswick. 
Elonichthys speciosus : Gyrolepis speciosus, A. Fritsch, Sitzungsb. 
k. bohm. Gesell. AViss. 1877, p. 46.—Lower Permian 
(Gas-coal); Bohemia. [Jaws and scales; Eoyal Bohemian 
Museum, Prague.] 
Here possibly may also be placed the undescribed species, Pro- 
palceoniscus agassizi, A. Pomel (Catal. Method. Vert. Foss. 1853, 
p. 133), from the Coal-Measures of Bert-Montconibroux, Allier. 
r/9 *>o* Genus AC ROLE PIS, Agassiz.^* 
7 o 
Trunk elongated, gradually tapering from the occiput. Mandi¬ 
bular suspensorium oblique; dentition consisting of a series of 
large, well-spaced conical teeth, and more numerous small teeth 
irregularly arranged and somewhat clustered ; head and opercular 
bones strongly ornamented with tuberculations, often fused into 
short vermiculating rugae and striae. Fins well developed, with 
fulcra, the rays branching distally, covered with dense ganoine, and 
the more robust sculptured. Pelvic fins with comparatively short 
base-line, dorsal and anal fins triangular, at least as high as long, 
the dorsal opposed to the space between the pelvic and anal fins; 
upper caudal lobe robust, the fin deeply forked and equilobate. 
Scales thick, large, or of moderate size, deeply imbricating, exter¬ 
nally enveloped in dense ganoine, sculptured with coarse oblique 
grooves and ridges, sometimes bifurcating; flank-scales rarely 
deeper than broad, ventral scales narrow; the large scales of the 
caudal pedicle extending well up the base of the superior caudal 
lobe. A/-Q>^rs 
Acrolepis sedgwicki, Agassiz. 
1829. “Fossil Fish,” A. Sedgwick, Trans. Geol. Soc. [2] vol. iii, 
p. 117, pi. viii. figs. 3, 4. 
