XXV111 INTRODUCTION. 



old, if not older, than these of Malvern, has one solitary organic 

 body been found Eozoon Canadense. This foraminifer or sponge 

 has not obtained its certificate, ' proved by the ends of being, to 

 have been/ without protest/' p. 61. 



1871. On the Geological Age and Microscopic Structure of the Ser- 

 pentine Marble or Ophite of Skye. Professors King and 

 Eowney. Proc. Roy. Irish Acad. ser. 2, vol. i. pp. 137-139. 



This rock, which is well known to be of Jurassic age, contains 

 all the "Eozoon" features " chamber-casts/' " intermediate 

 skeleton," " canal system," and " proper wall;" and, as in speci- 

 mens from Canada, the " chamber-casts " are occasionally pre- 

 served in, besides serpentine, a dark mineral resembling loganite, 

 also white pyroxene or malacolite ! This last mineral occurs in 

 crystalloids which frequently exhibit themselves in a decreted 

 condition internally and externally, the interspaces between 

 them and their hollowed-out interior being filled with calcite : 

 this substance has clearly resulted from the carbacidization of 

 the calci-magnesian silicate, malacolite. Some of the crystalloids 

 are in shapes strikingly resembling the " curiously curved canal 

 system"" of GiimbeFs " Eozoon Bavaricum" 



1871. Addendum to paper on Eozoon. Dr. J. W. Dawson. Proc, 



Roy. Irish Acad. ser. 2, vol. i. pp. 129-131. 

 Having examined specimens of the Amity rock containing 

 spinel (A.D. 1870), Dr. Dawson admits, but with some reticences, 

 the truth of our statement that " canal system " occurs in 

 ' ' unlikely " association with crystals of this mineral. te From 

 the general structure and aspect of these specimens, however, 

 I infer that they are portions of a bedded rock and not a vein- 

 stone " ! Other inferences, quite as gratuitous, are added to 

 destroy the force and significance of this " remarkable, critical, 

 and unlikely case." 



1871. On the Mineral Origin of the so-called " Eozoon Canadense/' 

 Drs. W. King and T. H. Rowney, Proc. Roy. Irish Acad. 

 ser. 2, vol. i. pp. 140-152. 



The authors notice the principal arguments and evidences 

 adduced in favour of " Eozoon " by Dawson, Carpenter, and 



