ANIMALS. 223 
PALEONISCUS COMTUS, Agassiz. Plate XXI, fig. 1 a, 6. 
PALMOTHRISSUM MAGNUM, Blaimville. Trans. Geol. Soc. Lond., 2d series, vol. iii, p. 117, 
pl. vii, figs. 1, 2, 1829. 
— MACROCEPHALUM, Blainville. Op. cit., pl. ix, fig. 2. 
— — . Phillips, Encye. Met., Geology, vol. vi, 
p. 610, pl. i, fig. 9, 1834. 
PaLHONISCUS COMTUS, Agassiz. Poissons Foss., vol. ii, pl. x 6, figs. 1-3. 
== = ie Ann. and Mag. Nat. Hist., vol. vu, p. 494, 1841. 
— — uh Morris, Catalogue, p. 200, 1843. 
— <= - Report 13th Meeting Brit. Assoc., p. 198, 1844. 
= == si De Verneuil, Bull. Soe. Géol. de France, 2™ série, vol. i, 
p. 38, 1844. 
— — se Geol. Russ., vol. i, p. 226, 1845. 
— — BA Tennant, Strat. List, p. 89, 1847. 
— — ie King, Catalogue, p. 14, 1848. 
— -- ts Howse, Trans. T. N. F. C., vol. i, p. 231, 1848. 
This species of Palgoniscus was considered by M. de Blainville to be identical with the 
Paleothrissum magnum of the Kupfer-scheifer ; but Agassiz has pointed out the following 
distinctive characters. The upper and lower margins of the scales are arched, and 
the scales themselves on the flanks are comparatively much deeper and longer than 
those of the caudal region. In Palgoniscus magnus the margins are straight; the 
scales nearly equilateral, and of more uniform dimensions. The other characters are 
well defined in the ‘ Poissons Fossiles,’ and easily appreciable.—P. G. E. 
Paleoniscus comtus is the most abundant fish of the Permian system of England, 
having been found wherever the Marl-slate is exposed, as at Kast Thickley, Midderidge, 
Ferry-Hill, Houghton-le-Spring, Whitley, Cullercoats, West Bolden, Brussleton, and 
other places. The specimen selected for illustration, which is in a rare and beautiful 
state of preservation, was found in the dark bituminous shale at Thrislington Gap. 
PALHZONISCUS ELEGANS, Sedgwick. Plate XXII, fig. 1 a. 
PALZOTHRISSUM ELEGANS, Sedgwick. Trans. Geol. Soc. Lond., 2d series, vol. iii, p. 117, 
pl. ix, fig. 1, 1829. 
— — i Phillips, Encye. Met., Geology, vol. vi, p. 619, 
1834. 
PaLZONISCUS — “ Agassiz, Poiss. Foss., vol. ii, p. 95, pl. x 4, figs. 4,5. 
BA Annals and Mag. Nat. Hist., vol. vii, p. 495, 1841. 
= — Morris, Catalogue, p. 208, 1843. 
aie = Report 13th Meeting Brit. Assoc., p. 198, 1844. 
— — De Verneuil, Bull. Soc. Géol. de France, 2™* série, 
vol. i, p. 38, 1844. 
= — Geol. Russ., vol. i, p. 227, 1845, 
