EXPLANATION OF THE PLATES. 



Plate XXXII. 



Fig. 1. Part of the irregularly tuberculated stem nearest to the root of oncylogona- 



tum carbonarium. 

 Fig, 2. Part of the same more regularly jointed, traversing the sandstone of the 



eastern Moorlands of Yorkshire. 

 Fig. 3. Specimen of micaceous shale, representing impressions of the jointed stems of 



the above plant, with their grooved expansions, and of the roots, — both flattened 



by pressure. 

 Fig. 4:. A portion of the bed immediately above the coal of Brora; exhibiting 



striated delineations similar to those of Jig. 3. 



Fig. 5. Subtriangular carbonaceous plates, occasionally found in the micaceous 

 shale of fig. 3. 



Fig. 6. The expansions of Jig. 3. magnified, exhibiting the raised dots between the - 

 grooves. 



PLATE XXXIII. 



Illustrates Sir A. Crichton's paper on some Parts of the Taunus, &c., and represents 

 the fossils referred to in the note at p. 268. This description is by Mr. G. B. 

 Sowerby, F.L.S. 



Fig. 1. Cast of the inside of a spirifer. 



Fig. 2. This shell appears to be a Pleurobronchus of Cuvier (Laniellaria of Mon- 

 tagu) : — and in this opinion, Mr. Sowerby states, that he is confirmed by M. 

 Heninghaus of Crefeld. 



Fig. 3. Transverse section of a circular encrinital vertebra. 



Fig. 4. Cast of a turbinated shell, probably a Cirrus. 



Fig, 5. Spiriferae : the same as Jig. 1 : and cast of the inside of an undescribed hyster- 

 olite or terebratula. 



Fig. 6. Transverse sections of a singular encrinital column. These sections are of a 

 very varied figure, most of them elliptical, probably from their having been com- 

 pressed in a lateral direction ; and their central perforation is pentagonal, fre- 

 quently forming five stellated points. 



Fig. 7. Longitudinal section of one of the same columns. 



Fig. 8. Convoluted section of the same. 



a. transverse section, similar to those of fig. 7. 



Fig. 9. Longitudinal section of another species of encrinital stem. 



Fig. 10. Impression of part of the stem of a reed. 



Fig. 11. Jointed portion of another reed stem. 



