514 Proceedings of the Royal Physical Society. 



given on p. 238, fig. 40. Accepting, then, this figure and 

 description as correct, Grossotlieca fimhriata is essentially- 

 distinct from Calymmatotheca schatzlarensis, Stur. In Grosso- 

 tlieca fimhriata the synangia are broader than long, having a 

 breadth of from 3-4 millim. and a length of about 2 millim. 

 in the compressed condition. Again, in Crossothecct fivihriata 

 the sporangia are numerous, narrow, oblong, or linear, and 

 are united to each other throughout almost the whole of 

 their length. The fructification of the two species is there- 

 fore altogether dissimilar. It is possible that the specimens 

 examined by Dr Stur were not so fully developed as those 

 figured by me, for on some of the small slabs from Yorkshire, 

 on which the fruit appears to be younger and scarcely so 

 well preserved as in the specimens I have figured, the entire 

 synangium is oval and but little broader than loug, and in 

 this condition it has a much closer approach in general 

 appearance to fig. 40 given by Stur on p. 238 of his " Carbon- 

 Flora " than to those given on my plate. 



The affinities of Crossotheca fivibriata are clearly Maratti- 

 aceous. In the union of the sporangia to each other, their 

 attachment to an oval (or circular) disk, and in their forming 

 a cup-like synangium, they have a considerable similarity to 

 the synangia of Kaulfiissia, Blume ; but in Kaulfitssia the 

 synangia are scattered on the back of the frond, not on por- 

 tions of the frond specially metamorphosed for fructification. 



Localities. — Monkton Colliery, near Barnsley, and East 

 Gawber Colliery, Barnsley, Yorkshire. 



Horizon. — Middle Coal-measures; Shale over "Barnsley 

 Thick Coal." 



Cyclotheca, Kidston, n. g. 



Description. — Sporangia small, free, sessile, circular, exan- 

 nulate, and arranged in two parallel rows. 



Bemarks. — In structure the individual sporangia approach 

 closely to those of Myriotheca, Zeiller,^ but in Myriotheca 

 the sporangia are oval and cover the whole of the lower 

 surface of the pinnules. 



1 Ann. (1. Sc. Kat., 6^ ser., vol. xvL, Bot., p. 186, pi. ix., figs. 18-20 ; also 

 Flore foss. clu bassin houil. d. Yalencieniies, p. 32, fig. 19. 



