PALiEONISClDiE. 
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. <$f 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 Reinet District, Cape Colony. 
Rubidge Coll.—Presented by the Eon. W. Guybon 
Atherstone, M.D ., 1875. 
P. 6300. Plaster cast of portion of squamation, the original in the 
Albany Museum, Cape Colony; Koomes River, Pish 
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.—X.W. shore of Lake 
Xyassa. -= ^ 
Acrolepis (?) drummondi, R. H. Traquair, ibid. p. 193.—Ibid. Q 
Acrolepis murchisoni , E. von Eichwald, Leth. Rossica, vol. i. ~ 
(1860), p. 1581 : Tetragonolepis murchisoni , Gf. Eischer 
de Waldheim, Bull. Soc. Imp. Xat. Moscou, vol. xv. (1842), 
pt. ii. p. 463.—Permian Conglomerate; Troitzk, Govt, of 
Orenburg, Russia. [? Includes Amblypterus orientalis, 
Eichw.: see p. 448.] & 
Acrolepis reticulata , E. von Eichwald, Bull. Soc. Imp. Xat. 
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, Eos,5. vol. ii. pt. ii. (1844), p. 162. 
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