﻿70 



DEVONIAN FAUNA. 



and the greater portion of its surface is covered with very indistinct rounded 

 rajs. It perhaps corresponds best with the left valves of the present form. 



Affinities. — The figures of Avicula Bohemica, Barrande, 1 are too defective for 

 complete determination. Its sculpture appears similar, but its shape is decidedly 

 broader. 



Avicula pupa, Barrande, 2 and A. sericaria, Barrande, 3 are distinguished by 

 having smaller front and hind wings. 



Avicula fenestrata, Follmann, 4 as given by Freeh, 5 is similar in ornament but 

 quite different in shape, being more circular and having a less anterior umbo. 



Pterinea reticulata, Goldfuss, 6 seems to be a broader shell, with a more 

 indented posterior side and a smaller front ear. 



10. Aotinopteria textubata, Phillips, var. subeenestrata, nov. Plate IX, fig. 4. 



Remarks. — A specimen in the Torquay Museum, which apparently came from 

 Barton or Lummaton, differs from the foregoing species in several particulars. 

 Its ornamentation is much coarser and more foliaceous, its shape much broader, 

 and its anterior side considerably longer. The margins are, however, so covered 

 by the matrix that its exact form cannot be determined with certainty. It seems 

 possible that it may be only a coarse variety of A. texturata, as its general contour 

 seems to correspond ; and I have thought it safer to regard it as such for the 

 present. At the same time the parts of it that are visible agree with Avicula 

 fenestrata, Follman, 7 except that the anterior side has the appearance of being 

 steeper and more oblique, and it is very possible that it may prove to belong to 

 that species instead of to the one to which it is at present annexed. 



Affinities. — Pterinopecten Dauniensis, Freeh, 8 has still coarser and more distant 

 ribs, and a much more central umbo. 



1 1881, Barrande, ' Syst. Sil. Boheme,' vol. vi, pi. ccxix, fig. 7, i— s ; and pi. ccxxii, figs. 14 — 16, 

 fJt. F. 



2 1881, Barrande, ' Syst. Sil. Boheme,' vol. vi, pi. ccxix, fig. 1, l— 3, Et. F. 



3 Ibid., pi. ccxix, fig. 2, 1-3, Et. F. 



4 1885, Follmann, " TJeberDev. Aviculaceen," ' Verh. Nat. Hist. Vereins preuss. Eheinl.,' vol. xlii, 

 p, 201, pi. ii, figs. 4 a, b. 



5 1891, Freeh, ' Abhandl. Geol. Specialk. Preuss.,' Band ix, pt. 3, p. 35, pi. xiv, figs. 11—11^. 



< ; 1834-40, Goldfuss, ' Petref. Genu.,' vol. ii, p. 136, pi. exx, fig. 2 ; and 1891, Freeh, 'Abhandl. 

 Geol. Specialk. Preuss.,' Band 9, pt. 3, p. 34, pi. iii, fig. 7 ; and pi. xiv, figs. 4 — 4 b. 



7 1885, Follmann, ' Verh. Nat. Hist. Vereins p. Eheinl.,' vol. xlii, p. 201, pi. iv, figs. 4 — 4 b ; 

 and L891, Freeh, ' Abhandl. Geol. Specialk. Preuss,' Band ix, pt. 3, p. 35, pi. xiv, figs. 11 — 11 d. 



8 1891, Freeh, ' Abhandl. Geol. Specialk. Preuss.,' Band ix, pt. 3, p. 15, pi. i, figs. 8—8 b. 



