﻿PAL^ONISCID^J. 509 



below. The superficial layer of ganoine upon each scale terminates 

 in a series of irregular digitations at the anterior overlapped border, 

 and is only marked in the posterior half by sparse, elongated pits ; 

 the hinder border exhibits a series of very large, downwardly 

 directed denticulations. 



These scales only differ essentially from those of the typical 

 Acrolepis in the presence of posterior denticles — a character usually 

 only of specific value. 



Form. <Sf Loc. Karoo Formation : South Africa. 



47080. The type specimen, being a group of scales of moderate 

 size, some well-preserved, and one shown, enlarged twice, 

 in PI. XV. fig. 4 ; Graaf Eeinet District, Cape Colony. 



Rubidge Coll. — Presented by the Hon. W. Guybon 

 Atherstone, M.D., 1875. 



P. 6300. Plaster cast of portion of squamation, the original in the 

 Albany Museum, Cape Colony ; Koomes Eiver, Fish 

 River, Cape Colony. Made in the Museum, 1876. 



Scales and other fragments, evidently in part of this genus, have 

 also been described as follows : — 



Acrolepis (?) africana, R. H. Traquair, in H. Drummond, Tro- 

 pical Africa (1888), p. 194.— N.W. shore of Lake 

 .Nyassa. 



Acrolepis (?) drummondi, R. H. Traquair, ibid. p. 193. — Ibid. 



Acrolepis murchisoni, E. von Eichwald, Leth. Rossica, vol. i. 

 (1860), p. 1581 : Tetragonolepis murchisoni, G. Fischer 

 de Waldheim, Bull. Soc. Imp. Nat. Moscou, vol. xv. (1842), 

 pt. ii. p. 463. — Permian Conglomerate ; Troitzk, Govt, of 

 Orenburg, Russia. [? Includes Amblypterus orientals, 

 Eichw. : see p. 448.] 



Acrolepis reticulata, E. von Eichwald, Bull. Soc. Imp. Nat. 

 Moscou, vol. xix. (1846), pt. ii. p. 299, pi. x. figs. 38, 39, 

 and Leth. Rossica, vol. i. (1860), p. 1578, pi. lv. fig. 14. — 

 Old Red Sandstone ; near Orel, Russia. [? Glyptopomus.~] 



An unknown fossil from the Carboniferous of Carluke, Lanark- 

 shire, is also named, without description, Acrolepis acutirostris, L, 

 Agassiz, Poiss. Foss. vol. ii. pt. ii. (1844), p. 162. 



