PLATE 37. 



Fig. 1. 523. 1. Stromatopora concentrica. (Pag- 136.) 



1 a. Tlie surface of a small hemispheric mass, showing tlie edges of tlie thin lamina' which arc uneqnally 



weathered. 

 1 6. A magnified portion of the same surface, showing the circular ends of the cylindrical tuhcs. 

 1 c. A magnified portion, showing the weathered edges of successive lamina: which are indented by the cclKs, 



giving them the appearance of being arranged in concentric lines. 

 1 (2. A transverse section of a small mass. 

 1 e. A magnified portion of the same. 



\ f. K larger mass, showing the elTects of weathering upon the thin concentric laminse. 

 1 g. The base of the same specimen, showing several centres of growth. 



