3l8 APPENDIX 



from Spain. He states the results of his examina- 

 tions very fully in a paper in the Journal of the 

 Geological Society of LondoJi} He retains the origi- 

 nal name for the older and calcareous form from 

 L'Anse a Loup, separating from it, however, another 

 form, A. Atlanticiis of Billings's, which is destitute of 

 distinct radiating septa and acervuline, like the lower 

 part of A. profundus. This he names Spirocyathus. 

 The Mingan species he places with Sponges under the 

 generic name, ArchcBoscyphia. In this Walcott sub- 

 stantially agrees with Hinde in his " Memoir on 

 the Lower Cambrian Fauna." Both seem to refer 

 Archaeocyathus to corals, though admitting its very 

 exceptional and anomalous structure. I think, how- 

 ever, we may still be allowed to entertain some doubts 

 as to the reference to corals, more especially as the 

 skeleton does not seem to have consisted of aragonite, 

 but of ordinary calcite, like that of the Foraminifera. 

 It is in any case a primitive form which seems to be 

 dying out in the Lower Cambrian, and we may hope 

 that it may be traced into the pre-Cambrian, and 

 may form a link connecting the Palaeozoic with the 

 Eozoic faunas. In my description of it in " The 



* Vol. xlv., 1889, pp. 125 et seq. 



