On the Structure of Lepidodendron selaginoides. 97 



1 7. Ectocmyus hrachiatus. — On R. pcdmata, Earlsferry, rare. 



18. Edocarpus tessellatus. — Joppa, in pools, on Lam. digitata, 



rare. 



19. Myriotrichia clavceformis. — Earlsferry, in shallow pools. 



20. Fucus platycarpus. — Joppa, on rocks near high water. 



21. Laminaria dehilis. — Joppa. 



22. Laminaria ccespitosa. — In pools, Earlsferry, rare. 



23. Callithamnion borreri. — Joppa, on Chondrus crispus. 



24. Callithamnion spar sum. — On Lam. digitata stems, Earls- 



ferry. 



25. Callithamnion floridulum. — Joppa, on rocks at low tides. 



26. Ceramium rubrum, var. joroliferum. — Joppa, at low 



water, rare. 



27. Ceramium rid)rum, var. decurrens. — Caroline Park, on 



Hal. siliquosa. 



28. Ceramium rubrum, var. fascicidatum. — Joppa, at low^ 



tides, rare. 



29. Ceramium strictum. — Earlsferry, on rocks, in the 



shade, etc. 



30. Polysiphonia formosa. — Joppa, in pools at low water. 



31. Polysiphonia fibrillosa. — Earlsferry, in pools at half 



tide; Firth of Forth {Grev.). 



32. ILildenbrandtia rubra. — On pebbles, in shallow pools. 



33. Petrocelis cruenta. — On rocks near low water. 



Note. — All of the above species w^ere found by G. W. 

 Traill, excepting Nos. 2, 4, 5, 7, 13, and 22, which were found 

 by E. M. Holmes, F.L.S. 



VI. On the Structure o/ Lepidodendron selaginoides {Stern- 

 berg), from the Coed Measures, Halifax, Yorkshire. By 

 Egbert Kidston, Esq. [Plates II. and II.«.] 



(Read 19th January 1881.) 



There is no genus of fossil plants which has received so 

 much attention from geologists and botanists, in regard to 

 their microscopical anatomy, as Lepidodendron. 



Since the first specimen, showing internal structure, was 



VOL. VI. G 



