EXPLANATION OF PLATE 3. C. 



UPPER PALEOZOIC ZOOPHYTA. 



1 MICHELINEA GEANDIS (M-^Coy). Natural size, from Arnside, some of the cells shewing the 

 vertical internal strise and connecting pores ; one of the external walls, slightly worn, shews the 

 internal vesicular structure. 



1 a Vertical (and of some of the columns slightly oblique) section, shewing the internal vesicular 



plates and the foraminated structure of the walls. 



2 CYATHAXONIA COSTATA (M«Coy). Natm-al size, from Derbyshire. 



2 a Vertical and horizontal sections, magnified two diameters, the former shewing the thick solid axis 



and very loose vesicular structure, of thin slightly curved plates, converging upwards to the axis ; the 

 latter shewing the thick radiating lamellae connected by the thin edges of the vesicular plates. 



3 STREPHODES MULTILAMELLATUM (M<^Ooy). Natural size, from Arnside: the top has been 



ground more nearly at right angles to the axis than the true opening of the cup, which latter 

 is indicated by the direction of the rings of growth. 



3 a Horizontal section, magnified one-third linear. 



4 CLISIOPHYLLUM KEYSERLINGI (M'^Coy). Natural size, from Derbyshire, shewing the thin 



external wall, or epitheca, in some parts, absent in others. 



4 a Horizontal section, natural size. 



5 CLISIOPHYLLUM PROLAPSUM (M<^Coy) Natural size, from Derbyshire, shewing the form of 



the terminal cup, and projecting boss of the inner area: in the lower part an accidental fracture 

 shews the inner area as a persistent tube. 



5 a Horizontal and vertical section magnified two diameters ; shewing the strong wall to the inner area. 



6 CLISIOPHYLLUM BIPAETITUM (M'^Coy). Young stem, natural .size, from Derbyshire, retain- 



ing a few patches of the epitheca or external wall, and shewing the shape of the terminal cup 

 (the medial crest on the boss not distinctly seen in this view). 



6 a Horizontal and vertical sections, natural size. 



7 OYATHOPHYLLUM DIANTHOIDES (M-^Coy). Compound group of old stems from Arnside, 



shewing the way in which clusters of young stems grow from within the edge of the parent. 

 Natural size. 



7 a Horizontal section of part of star, magnified two diameters, shewing the outer vesicular zone with 



its short and long lamellre, the extension of the latter without vesicular plates towards the centre, and 

 the central space destitute of lamellte. 



7 b Cone of middle age, magnified two diameters, shewing at top the characters of the tei-minal 



cup, with its alternately large and small lamellae, and the flat unradiated space at bottom, formed 

 by the transverse diaphragms. The lower part is a vertical section, shewing the transverse diaphragms 

 and outer highly- inclined area of minute vesicular tissue. (The vertical lines at bottom are radiating 

 lamell£e, shewn by the curving of the centre out of the plane of section). 



8 CYATHOPHYLLUM PSEUDO-VERMICULARE (M-'Coy). Column natural size, from Kendal, 



shewing the vertical strise and transverse nodulation. 

 8 a Shewing origin of young branch. 



