APPENDIX 307 



points of resemblance to Sponges or even to 

 Hydroids, in its skeleton and mode of growth, and 

 even in the arrangement of its soft parts. 



Taking this view of its nature and relations, the 

 genus and the Laurentian species may be charac- 

 terized as follows : — 



Genus EOZOON, Dawson. 

 Foraminiferal skeletons, with irregular and often 

 confluent cells, arranged in concentric and horizon- 

 tal laminae, or sometimes piled in an acervuline man- 

 ner. Septal orifices irregularly disposed. Proper 

 wall finely tubulated. Intermediate skeleton with 

 branching canals. 



EozooN Canadense, Dawson. 

 In inverted conical or rounded masses or thick 

 encrusting sheets, frequently of large dimensions. 

 Typical structure stromatoporoid, or with concentric 

 calcareous walls, frequently uniting with each other, 

 and separating flat chambers, more or less mam- 

 millated, and spreading into horizontal lobes and 

 small chamberlets ; chambers often confluent and 

 crossed by irregular calcareous pillars connecting the 

 opposite walls. Upper part often composed of 

 acervuline chambers of rounded forms. Proper wall 



