4 A. SMITH WOUDWAKD, U. DEVOXIAN FISH-REMAINS. 



verge slightly towards the middle of the hinder börder and 

 sometimes bifurcate towards the middle of the anterior 

 overlapped margin. None of these ridges seeni to be siil)di- 

 vided into tiibercles; but quite at the hinder börder of ano- 

 ther large scale (no. 2) they become distinctly tubercuhir. 



A nearly circular scale (no. 3) from 0038 m. to 0*04 m. 

 in diameter, appears to be similarly ornamented, some of the 

 ridges being partly subdivided into tul)ercles; but this spe- 

 cimen is too imperfect to display all its characters. 



Another slab (no. 4) contains interesting remains of 

 smaller scales. One of these (fig. 2) is deeply ovate and 

 shows the externa! ornamentation, but is imperfect both at 

 the anterior and posterior börder. The concentric lines of 

 growth are observable in its covered portion (a); while the 

 ridged ornament of its exposed portion (h) is rather coarse, 

 with a slight tendency to subdivision. A second specimen 

 (fig. 1) is less deepened in proportion to its width and shown 

 only in impression. Its covered portion (a) is not more than 

 half as Avide as its exposed portion (?>); while the rather 

 coarse ridged ornament converges, as in the largest scales, 

 towards the middle of the hinder börder. The middle ridges 

 bifurcate towards the anterior overlaj)ped margin, and they 

 seem to be only slightly constricted at intervals. 



The convergence of the stout ridges towards the hinder 

 börder, and the bifurcation of those on the middle of the 

 scale towards its anterior overlapped margin, are features 

 equally well seen in another specimen (no. 5) represented in 

 fig. 3. So far as can be determined from the impression 

 of the ridges, none are sul)divided into tubercles in this 

 specimen. The overlapped margin (a) of the scale, which is 

 partly preserved, is only half as wide as the exposed por- 

 tion (b). 



Two imperfect scales (nos. 6, 7) nearly as large as the 

 last l)ut more elongated antero-posteriorly, are interesting on 

 account of their comparatively fine ornamentation. One of 

 these (lig. 4), of which the outer face is only partly shown 

 in impression, exhibits the usual slight convergence of the 

 ridges towards the middle of the hinder börder, where they 

 seem to be partly replaced by tubercles. The other scale 

 (fig. 5), which occurs as a somewhat obscure impression of its 

 outer face, exhibits peculiar fine markings radiating forwards 



