PLATE XIII. 



Figs. 1 — 3. — Anthracomya Adamsii, var. expansa. From the Little Mine 

 Ironstone, Great Fenton. My Collection. (Page 91.) 



Fig. 4. — Anthracomya dolabrata. The type specimen from Prof. Prestwich's 

 ' Geology of Coalbrookdale,' pi. xxxix, fig. 9, refigured by the Professor's kind 

 permission. (Page 93.) 



Figs. 5 — 9 and 11.- — Anthracomya dolabrata. A series from the Little Mine 

 Ironstone of Great Fenton. My Collection. (Page 93.) 



Fig. 7 a. — Fig. 7 seen from above, showing width. (Page 93.) 



Fig. 9 a. — Fig. 9 seen from above. (Page 93.) 



Figs. 10 and 12. — Anthracomya modiolaris. Short truncate form from the 

 roof of the Holly-Lane Coal, North- Staffordshire Coal-field. In the Collection of 

 Mr. John Ward, F.G.S. (Page 95.) 



Figs. 13 and 16. — Anthracomya Wardi. Smooth keelless form from the 

 Shale Coal of Wakefield. From the Collection of Mr. David Campbell of 

 Wakefield. (Page 105.) 



Fig. 14. — Anthracomya modiolaris. The cast of a large form from the Upper 

 Coal-measures of Old Cummock, Ayrshire. From the Collection of Mr. Smith of 

 Kilwinning. (Page 95.) 



Fig. 15. — Anthracomya Wardi. From the roof of the Eight-foot Coal of Durie, 

 Fife. My Collection. (Page 105.) 



