ANIMALS. 



223 



Pal^oniscus comtus, Agassiz. Plate XXI, fig. 1 a, h. 



Pal/eothrissum magnum, Blainville. Trans. Geol. Soc. Lond., 2d series, vol. iii, p. 117, 



pi. viii, figs. 1, 2, 1829. 



— MACUOCEPHALUM, Blainville. Op. cit., pi. ix, fig. 2. 



— — „ Phillips, Encyc. Met., Geology, vol. vi, 



p. 610, pi. iii, fig. 9, 1834. 

 Pal^oniscl's COMTUS, Affossiz. Poissona Foss., vol. ii, pi. x b, figs. 1-3. 



Ann. and Mag. Nat. Hist., vol. vii, p. 494, 1841. 



Morris, Catalogue, p. 200, 1843. 



Report 13th Meeting Brit. Assoc, p. 198, 1844. 



De Verneuil, Bull. Soc. Geol. de France, 2""* serie, vol. i, 



p. 38, 1844. 

 Geol. Russ., vol. i, p. 226, 1845. 

 Tennant, Strat. List, p. 89, 1847. 

 King, Catalogue, p. 14, 1848. 

 Howse, Trans. T. N. F. C, vol. i, p. 231, 1848. 



This species of Falceoniscus was considered by M. de Blainville to be identical with the 

 Palaothrissum 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 Palaoniscus 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. 



Paleeoniscus comtus is the most abundant fish of the Permian system of England, 

 having been found wherever the Marl- slate is exposed, as at East 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. 



Pal^oniscus elegans, Sedgwick. Plate XXII, fig. 1 a. 



Pal^otheissum elegans, Sedgwick. Trans. Geol. Soc. Lend., 2d series, vol. iii, p. 117, 



pi. ix, fig. 1, 1825. 

 — — „ Phillips, Encyc. Met., Geology, vol. vi, p. 619, 



1834. 

 Pal^oniscus — „ Agassiz, Poiss. Foss., vol. ii, p. 95, pi. X 6, figs. 4,.*). 



Annals and Mag. Nat. Hist., vol. vii, p. 495, 184 1 . 

 Morris, Catalogue, p. 208, 1843. 

 Report 13th Meeting Brit. Assoc, p. 198, 1844. 

 De Verneuil, Bull. Soc. Geol. de France, 2°" serie, 



vol. i, p. 38, 1844. 

 Geol. Russ., vol. i, p. 227, 1845 , 



