6 c Horizontal section magnified two diameters, shewing the nearly equal radiating lamella; delicately prolonged 



to the walls; supported by the strong circle of vesicular plates surrounding the inner area. 



7 LONSDALEIA STYLASTR^IFORMIS (M°Coy). One detached column natural size, from Kendal. 



7 a Vertical polished section magnified three diameters, shewing the characters of the axis and the two areas ; 



the upper part is a rough transverse fracture, shewing the oblique undulated outer area and a horizontal 

 fracture of the axis and lamelliferous area. 



7 I) Horizontal section magnified two diameters, shevnng the occasional unradiated portion of the outer area 



in half of the circumference. 



8 SARCINULA TUBEROSA (M^Coy). Portion of large mass natural size, exhibiting the terminal weathered 



stars, and rough vertical section, shewing the thin layers of vesicular tissue extending with a double curve 

 from one centre to another, and the transverse cellular plates filling the central tubes, also the not uncommon 

 appearance of the axis weathering as a separate cylinder, vertically sulcated by the origins of the radiating 

 costal lamella. 



8 a Horizontal and vertical sections of portion of a small specimen magnified three diameters, the former shewing 



the plain centres, and the uninterrupted passage of the radiating lamell«, from one centre to another, con- 

 nected by the vesicular plates. 



9 SARCINULA PLACENTA (M'Coy). Fragment natural size, shewing the lamellse passing from centre to centre 



on the flat upper surface, and the edge of the mass shewing the mode of w-eathering in horizontal lamin;e, 

 the centres remaining as persistent cylinders vertically striated by the radiating lameUs. 

 9 a ~ Vertical section. 



9 h Horizontal section, shewing the near equality in strength of the radiating and vesicular plates, and the conse- 



quent indistinctness of tlie radiation. 



10 CLADOCHONUS BREVICOLLIS (M'Coy). Natural size, from Derbyshire. 



11 DENDROPORA MEGASTOMA (M'Coy). Several portions on a bit of limestone, natural size, from Derby- 



shire. 



11a A portion magnified six diameters, to sliew the twelve tubercular sulci of the cells, and the obscure porosity 



and striation of the exterior. 



12 FISTULIPORA MINOR (M«Coy). Old specimen natural size, from Derbyshire; enveloping a foreign body, 



shewing the appearance of the rough fracture and a portion of the exterior. 

 12 a — Vertical, rough and polished sections magnified four diameters, the former shewing the tubes entire with the 

 intervening cellular structure, the latter shewing also the transverse septa of the tubes. 



12 h Horizontal section of another portion magnified twelve diameters. 



13 Undetermined. 



14 MICHELINEA GLOMERATA (M'Coy). Portion of large mass natural size, from Derbyshire, with a rougli 



section at one comer, and a polished section below. 



