﻿FAL^0NISCID2E. 507 



si on ally branching 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 

 anteroinferior obtuse angles. 



Form. § Loc. Lower Carboniferous : Derbyshire, Yorkshire, 

 Lanarkshire, and Belgium. 



P. 849. Scales ; Yoredale Rocks, Hebden Bridge, Yorkshire. 



Egerton Coll. 



P. 3409. Scales ; Hebden Bridge. Enniskillen Coll. 



P. 3412. Group of scales ; Carluke, Lanarkshire. Enniskillen Coll. 



28753. Group of large scales ; Chokier, Belgium. Purchased, 1853. 



Acrolepis wilsoni, Traquair. 

 [Plate XV. fig. 3.] 



1888. Acrolepis ivilsoni, R. H. Traquair (ex J. "Ward, MS.), Geol. Mag. 

 [3] vol. v. p. 254. 



Type. Scales ; British Museum. 



A large species, known only by the scales mentioned below. 

 Ornamental ridges of flank-scales large and broad, marked with 

 very 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, fy Loc. Yoredale Rocks : Derbyshire. 



P. 5329. Group oi twelve scales and bone-fragments, the type 

 specimen ; from shales in Yoredale series of Turnditch, 

 near Belper. The best-preserved scale is shown, of twice 

 the natural size, in PL XV. fig. 3. 



Presented by Edward Wilson, Esq., 1887. 



Acrolepis semigranulosa, Traquair. 



1890. Acrolepis semigranulosus, R. H. Traquair, Proc. Roy. 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, fy Loc. Calciferous Sandstone : Straiton, near Edinburgh. 



Not represented in the Collection. 



