MIKUTE STETJCTURE Or STEOMATOPORA AND ITS ALLIES. 195 



Gekeral Steuctuee oe a Typical Steomatopoea. 



If we take a typical species of Stromatopora, such as S. con- 

 centrica, Gold., of the Devonian, we find that it presents itself 



Fig. 1. 



Stromatopora rugosa. 



A small and perfect specimen, of the natural size, from the Trenton Limestone 

 of Canada. (After Billings.) 



Dr. Steinmann has published a memoir, "Ueber fossile Hydrozoen" [Palfe- 

 ontographica, n. F. v. 3 (xxv.), p. 101], in which he refers Stromatopora to the 

 Hydractiniidse, and as being structurely similar to his new genus Sphcer actinia, 



Mr. Carter expresses the opinion that Stromafopora is identical in structure 

 with the recent Millepora alcicornis (Ann. & Mag. Nat. Hist. ser. 5, vol. i. p. 298). 

 A perusal of Mr. Carter's remarks will at once show that in speaking of " Stroma- 

 topora " he is really alluding only to the curious and aberrant Caunopora. In a 

 second paper (ibid. p. 412) Mr. Carter announces that he has detected " hexac- 

 tinellid structure " in Stromafopora from Devonshire, and in a third (ibid, 

 vol. ii. p. 85) he says that the form presenting this structure is S. ooncentrica, 

 and that he has determined this to be really Caunopora, Phill. 



In a paper on the Microscopic Structure of the Stromatoporidse, not yet pub- 

 lished in full, Principal Dawson gives grounds for believing that the Stromato- 

 poroids are truly Foraminiferal, and are the Palaeozoic representatives of Eozoon 

 (Abstract, Proc. Geol. Soc. No. 355, p. 4). 



Finally, Mr. A. Champernowne (ibid. p. 5) gives an account of the Stromato- 

 poroids of Devonshire, and his views as to their structure and nature. 



