APPENDIX 317 



Foraminifera, and if so, they were very large and 

 complex forms of that group, consisting of perfor- 

 ated chambers arranged around a central cavity. 

 I accordingly mentioned them in this connection in 

 1875, '^ot as closely related to Eozoon, but as 

 apparently showing the existence of very complex 

 foraminiferal forms in the Lower Cambrian. 



The specimens thus noticed were altogether cal- 

 careous, and were of the species named A. profundus 

 by Mn Billings. He had, however, referred to the 

 same genus silicified specimens from a later forma- 

 tion, the Calciferous (Upper Cambrian) at Mingan, 

 under the name A, Mingauensts, which were 

 subsequently found to be associated with spicules 

 resembling those of lithistid sponges, and which 

 proved to be very different from the Lower Cam- 

 brian form, and are now referred to a different 

 genus. The subject had thus become involved in 

 some confusion, and was left in this state by Mr. 

 Billings on his death. I therefore asked my friend, 

 Dr. Hinde, of London, to re-examine my specimens, 

 and at the same time those of the Geological Survey 

 were placed in his hands by Mr. Whiteaves. Hinde 

 also obtained specimens from Lower Cambrian rocks 

 in Sardinia, where they seem to be abundant, and 



