8 CCENITES STRIGATUS (M°Coy). Branch natural size, from Dudley. 



8 a Portion of ditto magnified four diameters. 



9 FAVOSITES CRASSA (M'^Coy). Portion of large branching lobed mass, natural size, from Coniston 



Water Head. 



9 a Portion of ditto magnified eight diameters, shewing the proportions of the diaphragms, and rows 



of connecting pores. 



10 STREPHODES CRAIGENSIS (M'Coy). Fragment of large branch natural size, from Craig Head. 

 10 a Vertical and horizontal section of ditto magnified two diameters, shewing the very thick, nearly solid 



lining to the walls, the characters of the radiating laraellfe, and the loose, nearly horizontal vesicular 

 plates, forming the transverse cells, in the vertical section. 



10 5 Young twisted branch natural size. 



11 CYATHAXONIA SILURIENSIS (M-'Coy). Natural size from Upper Ludlow Rock of Under- 



barrow, Kendal. 



11a Ditto magnified three diameters, shewing the strong costse, very large axis, and thick radiating 



lamellae, most of them splitting as they reach the wall. 



12 CANINIA LATA (M^Coy). Part of old terminal cup, natural size, from near Wenlock, shewing a 



portion of the very thin epitheca on one side. 



13 Ditto natural size, shewing the form of the young cup with one of the diaphragms exposed at base, 



with the deep siphonal inflection, and a few radiciform tubercles from the surface. 



14 PTILODIOTYA {Stidopora) FUCOIDES (M'^Coy). From the schists of Llansantfraid. 



14 a Portion of ditto magnified twelve diameters. 



15 PTILODICTYA (^Stidopora) COSTELLATA (M<^Coy). Branch natural size, from the slates of 



Llansantfraid. 



15 a Section of ditto magnified eight diameters, shewing the thick flattened axis or plate on which the 



two rows of cells rest. 



15 5 Ditto portion of surface of cast magnified six diameters, shewing the granular non-celluliferous margin, 



and the linear disposition of the lengthened cells. 



16 PTILODIOTYA {Stidopora) EXPLANATA (M'^Coy). Portion of one of the thin undulating foliaceous 



expansions, shewing the thin wrinkled central plate or axis, with the cells sticking on in some places ; 

 natural size from the slates of Llansantfraid. 



1 6 a Portion of ditto magnified six diameters, shewing the cast of the cells, each with its terminal 



aperture, and attached by its posterior narrow end to the thin undulated mesial plate. 



16 5 Cast of portion of surface magnified twelve diameters, shewng the round apertures of the cells in 



the middle of the rhomboidal outer wall, with the granular impressions of the interstitial pitting, from 

 Coniston. 



17 BERENICEA HETEROGYRA (M<^Ooy). From the Coniston limestone of Coniston, natural size, 



parasitic on an Orthoceratite. 

 17 a Portion of ditto magnified six diameters. 



17 b A few of the cells of ditto magnified fourteen diameters, shewing the terminal aperture and the 



granulation on the outer wall. 



18 RETEPORA HISINGERI (M'^Ooy). Natural size from Coniston limestone of Coniston Water Head. 

 ] 8 a Cast of portion of ditto magnified seven diameters, shewing the casts of the numerous cells left by 



the decomposing corals. 



19 FENESTELLA RIGIDULA (M-^Coy). Natural size from Dudley. 



19 a Portion of ditto magnified thirty diameters. 



20 FENESTELLA PATULA (M-^Coy). Natural size from Dudley. 

 20 a Portion of ditto magnified twelve diameters. 



