CONTEMPOEAEIES AND SUCCESSOES OF EOZOON. 159 



tubes, or groups of tubes, wbicb in each successive 

 floor give out radiating and branching canals exactly 

 like those of Eozoon, though more regularly arranged ; 

 and if we had specimens with the canals infiltrated 

 with glauconite or serpentine, the resemblance would 

 be perfect. When, as in figs. 44 and 45 A, these canals 

 are seen on the abraded surface, they appear as little 

 grooves arranged in stars, which resemble the radiating 

 plates of corals, but this resemblance is altogether 

 superficial, and I have no doubt that they are really 



Fig. 44. Caunopora planulata^ Hall — Devonian ; showing the radi- 

 ating canals on a weathered surface. {After Hall.) 



foraminiferal organisms. This will appear more dis- 

 tinctly from the sections in fig. 45 b, c, which repre- 

 sents an undescribed species recently found by Mr. 

 i^eston, in the Upper Silurian limestone of Ontario. 

 There are probably many species of these curious 

 ssils, but their discrimination is difficult, and their 

 )menclature confused, so that it would not be profit- 

 )le to engage the attention of the reader with it 

 ccept in a note. Their state of preservation, how- 

 ever, is so highly illustrative of that of Eozoon that a 

 word as to this will not be out of place. They are 



