218 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Jan. 10, 



210 diameters. From Lisoughter. (The figure is represented more 

 compressed than it really is, so as to occupy as little space as possible.) 

 Fig. 9. This figure represents, by reflected light, a mass of floccuhte lying be- 

 tween, or adjacejit to, two granules of serpentine. One of the granules 

 is fringed with aciculi. The flocculite shows here and there a rude 

 divisional or prismatic structure, which becomes acicular ; in two places 

 well-developed aciculi rise out of the mass. Magnified 210 diameters. 

 From Lisoughter. 



10. Two granules ("chamber-casts"), viewed by reflected light, of serpentine 



connected by a crystal of pyrosclerite ? (answering to a " cast of a 

 stolon-passage"), lying across a decalcified passage. The crystal has 

 a thin layer of white granular matter adhering to each of its sides ; 

 and the granules are furnished with a portion of asbestiform layer. 

 Magnified 105 diameters. From Grenville. 



11. Crystal of pyrosclerite (?), answering to a "cast of a stolon-passage," 



lying across a decalcified passage ; it is not long enough to connect 

 two opposite granules of serpentine, but the connexion is completed 

 by the interposition of a " white amorphous mass," b, rudely lami- 

 nated. The other connecting body, wluch may also be taken for a 

 " cast of a stolon-passage," consists entirely of a rudely laminated 

 " white amorphous mass." Magnified 105 diameters. From Grenville. 



Plate XV. 



12. This figure represents a dendritic specimen of metaxite {identical with re- 



presentatives of the " canal-system " of " Eozoon Canadense "), as it ap- 

 pears under an object-glass magnifying 1 10 diameters. Obtained by de- 

 calcifying its matrix — saccharoidal calcite. From Reichenstein, Silesia. 



13. A small portion of Ophite, decalcified, from Lisoughter. The spheroidal 



bodies are granules (" chamber-casts " of " Eozoon ") of translucent ser- 

 pentine, imbedded in saccharoidal calcite (" skeleton") — the dark por- 

 tions. Tufts of crystals ("metamorphosed" examples of the "canal- 

 system") are variously attached to the granules, while other tufts are 

 fixed in the calcite. Two granules in the middle of the lower portion 

 of the figure are connected by three white, slightly granular, 'parallel 

 plates, representing "stolon-passages;" other granules are connected 

 by tufts of crystals. Magnified 25 diameters. 



14. Granule of serpentine ("chamber-cast"), from a decalcified specimen of 



Lisoughter Ophite, to which are attached scopiform bundles of crystals, 

 representing "metamorphosed" examples of the "canal-system." The 

 crystals are divergent, also subparallel. Magnified 210 diameters. 



15. Represents the two granules of serpentine noticed under figure 13. 



Magnified 120 diameters. 



16. Representations of a branching vermicular body, a, lying lengthways, 



and of a transverse section of another, b, both showing aciculi 

 shooting off from their surfaces. The vermicules and aciculi, of a 

 yellowish-brown colour, are imbedded in transparent chalcedony. 

 Magnified 210 diameters. From a " Moss-agate " presented by Pro- 

 fessor Tennant. 



17. An "amorphous mass," representing the "canal-system," of a prismatic 



structure, lying in a decalcified passage, c, between four irregular- 

 shaped granules of serpentine, a. The " mass," b, at its sides, is sepa- 

 rated into prisms, wliidi curve oiF, and in a few places become 

 branched ; it is, for the most part, however, compactly prismatic, and 

 has an incipient lustre. Magnified 60 diameters. From Grenville. 



18. Representation, natural size, of a botryoidal specimen of Permian lime- 



stone, from Building Hill (People's Park), near Sunderland. The 

 rounded and irregular-shaped bodies, formed of brown subcrystalline 

 carbonate of lime, simulate the '■^chamber-casts" of ^^ Eozoon Cana- 

 dense:" the vacant spaces, once filled with earthy carbonate of lime 

 and magnesia (which has been weathered out), correspond to the 

 - decalcified -passages or the so-called "calcareous skeleton." 



