76 me. Stanley smith on [March 19 13, 



Plate VI. 



Aulophyllum fungiics (Flem.). Sections illustrating the variability 

 of the species. All from Peterhill Quarry, Bathgate. [The magnifi- 

 cation in every case is 1"5.] 



Fig. 1. Transverse section, ' radial' type. Mut. towards pachyendothecum. 



2. Transverse section, ' radial ' type. Mut. pachyendothecum. 



3. Transverse section, ' rose ' type. Mut. towards pachyendothecum. 

 4 a. Transverse section, ' rose ' type. Mut. pachyendothecum. 



4 b. Vertical section of the last-figured specimen. The section passes 

 through the middle of the central column in the upper part of the 

 coral, but approaches the margin of the same in the lower part. 

 Contrast this figure with PI. VII, fig. 3b. 



Plate VII. 



Aulophyllum fungites (Flem.). Forms from Northumberland and Durham. 

 [The magnification in every case is 1"5.] 



Fig. 1. Transverse section. Mut. towards pachyendothecum, but little 



advanced upon Stage E. Central column of the 'radial' type. 



Thornbrough Limestone, Thornbrough Quarry, near Corbridge 



(Northumberland). 

 2. Transverse section. Mut. towards pachyendothecum. Small variety 



from the Thornbrougli Limestone, Stanton (Northumberland,). 



Apparently a dwarfed form of fig. 1 . 

 3 a. Transverse section of a smaller example of fig. 4. Columella of the 



' rose ' type. 

 3 b. Vertical section of fig. 3 a. Note the numerous and compacted vesicles 



in the central column and the small regular outer dissepiments. 



4. Transverse section. Mut. pachyendothecum. A variety especially 



characteristic of the Great Limestone, Weardale (County Durham). 

 Also common in other beds in the Weardale and Alston district. 

 Note the small but densely-packed central column. From the Great 

 Limestone, Stanhope-in- Weardale. . 



5. Transverse section. Mut. towards pachyendothecum, showing a 



'rose' type, and a very wide space between the ends of the septa 

 and the central column. Great Limestone, Black Pasture Quarry, 

 near Chollerford (Northumberland). 



Plate VIII. 



Aulophyllum fungites (Flem.). Forms from Cumberland and Wales. 

 [The magnification in every case is 1*5.] 



Figs. 1 & 2. Transverse sections. Mut. cumbriense, Humphrey Head (More- 



cambe Bay). 

 Fig. 3. Transverse section. Mut. tenbiense, Lydstep (Tenby). 



4. Transverse section of another specimen from Humphrey Head, cut 



through Stage D, showing the characters of mut. tenbiense. 

 0. Transverse section. Mut. towards pachyendothecum, not much 

 advanced upon Stage D; variety from Gleaston, near Barrow-in- 

 Furness. 

 6 a. Transverse section of the last at Stage D, showing characters similar 



to those of mut. tenbiense. 

 6 b. Transverse section. Mut. near pachyendothecum. Craignant, near 

 Oswestry. 



Plate IX. 



Aulophyllum fungites (Flem.). Sections illustrating 

 rejuvenescence, etc. 



Figs, la-lc. Transverse sections of a coral displaying rejuvenescence; la&16 

 are cut below the point of rejuvenescence, and 1 c about that 

 point (at a, b, & c in text-fig. 8, p. 73). X 1'5. 



Fig. 2. Vertical section of another coral showing the same phenomena. X 1*5. 



