PAUEOXISCIDiE. 
507 
sionally brandling and anastomosing, or, where two diverge, another 
being intercalated between ; ridges of caudal scales sometimes fused 
at intervals into a reticulation towards the postero-superior and 
antero-inferior obtuse angles. 
Form. Sf Log. Lower Carboniferous: Derbyshire, Yorkshire, 
Lanarkshire, and Belgium. 
P. 849. Scales ; Yoredale Bocks, Hebden Bridge, Yorkshire. 
Egerton Coll. 
P.3409. Scales; Hebden Bridge. Enniskillen Coll. 
P. 3412. Group of scales; Carluke, Lanarkshire. EnnisJcillen Coll. 
28753. Group of large scales ; Chokier, Belgium. Fur chased, 1853. 
Acrolepis wilsoni, Traquair. 
[Plate XY. fig. 3.] 
1888. Acrolepis wilsoni, B. H. Traquair (ex J. Ward, MS.), Geol. Mao-. 
[3j vol. v. p. 254. 
Type. Scales ; British Museum. 
A large species, known only by the scales mentioned below. 
Ornamental ridges of Hank-scales large and broad, marked with 
■\erj fine longitudinal striations, and so frequently connected one 
with another by short cross-ridges as to impart to the exposed 
surface a pitted appearance. 
Form. $ Loc. l r oredale Bocks : Derbyshire. 
P. 5329. Group of twelve scales and bone-fragments, the type 
specimen; from shales in Yoredale series of Turnditc-h, 
neai Belper. The best-preserved scale is shown, of twice 
the natural size, in PI. XY. fig. 3. 
Presented by Edward Wilson , Esq., 1887. 
Acrolepis semigramalosa, Traquair. 
1890. Acrolepis semigramdosus, B. H. Traquair, Proc. Boy. Soc. Edinb. 
vol. xvii. p. 398. 
Type. Scales; Edinburgh Museum. 
Scales relatively large, “ covered with innumerable oblique, 
closely-set, fine ridges, often tortuous, and tending constantly to 
break up into tubercles.” 
Form. Loc. Calciferous Sandstone : Straiton, near Edinburgh. 
Xot represented in the Collection. 
