PLATE L. 



CARBONIFEROUS SPECIES. 



{Supplementary illustrations?} 



Fig. • . . 



1, 2. Spirifera convoluta, Phillips. Two very large and fine examples from the 

 ' . Carboniferous limestone of Thornely, near 



Chipping, Lancashire. Fig. 1 is perfect, and 



from the collection of Mr. J. Rofe, of Preston. 



3 — 9. ,, trujonalis. Various specimens to illustrate certain modifications or 



passage shapes connecting Sp. trigonalis and Sp. bisul- 

 cata. Pig. 3 from Brockley, near Lesmahago ; fig. 4 

 from Cousland, near Dalkeith, Scotland ; figs. 5, C, 7, 

 showing the gradual prolongation of the wings in 

 certain individuals, from the Lower Scar limestone of 

 Settle, in Yorkshire ; fig. 8 from Derbyshire, in the 

 collection of Dr. Fleming, of Manchester ; fig. 9 from 

 Barrhead, Renfrewshire, Scotland. 

 10 — 18. „ triangularis. A fine series of specimens obtained by Mr. Burrow 



from the Lower Scar limestone of Settle, in Yorkshire. 

 19. Ctjrtina septosa. A large specimen. From the Lower Scar limestone of Settle, 



in Yorkshire, and collection of Mr. Burrow. 



