516 Proceedings of the Boyal Physical Society. 



Note, — Since this paper was put into type I have been 

 favoured by my friend, M. Crepin, Director of the State 

 Botanical Gardens, Brussels, with two fruiting specimens of 

 Calymmatotheca schatzlarensis, Stur, from one of the original 

 localities — Charbonnage de I'Agrappe, Framerier (Fosse 

 Grand Trait), Belgium. With these I have compared the 

 Yorkshire examples, and find that the plant I had named 

 Crossotheca fimhriata is the Calymmatotheca schatzlarensis, 

 Stur. The woodcut given by Stur of the fruit of his fern 

 (/. c, p. 238, fig. 40) is therefore quite misleading, and does 

 not at all represent the fruit of the plant from the same 

 locality which has been forwarded to me by Mons. Crepin 

 under Stur's name. In fact the description Stur gives of 

 his admittedly badly preserved fruit leads one to inquire 

 whence the evidence has come for the creation of his fig. 40. 



The fossil remains, however, in the genus Crossotheca, but 

 under the name of Crossotheca schatzlarensis, Stur, sp. 



EXPLA.NATION OF PlATE. 



Crossotheca fimhriata, Kidston. 

 Figs. 1-3. Fruiting pinnse. 

 Figs. 4 and 5. Synangia, enlarged 65 times. 

 Fig. 6. Portion of a Synangium, enlarged 18 times. 

 Figs. 7 and 8. Fragments of barren pinnae. 



Crossotheca Crepini, Zeiller. 

 Fig. 9. Fruiting pinnule, enlarged 5 times (after Zeiller). 



Cyclothcca hiseriata, Kidston. 

 Fig. 10. Specimen, natural size. 

 Fig. 11. Sporangia, enlarged 6^ times. 

 Fig. 12. Sporangia, enlarged 20 times. 



XLI. On the Fmctification and Affinities of Archgeopteris 

 hibernica, Forhes, sp. By Egbert Kidston, F.RS.E., 

 F.G.S. 



(Read 18th April 1888.) 



Under the name of Cyclopteris hihernica, ArcJia^opteris 

 hihernica was described by Forbes in 1852 ^ from the Yellow 

 Sandstones of the south of Ireland, where, at Kiltorkan and 

 ^ Brit, Assoc. Eeport, 1852, p. 43. 



