2S 



DESCRIPTIOX OF PLATE II. 



Page. 



Atikokanu ip.eegulaeis, Walcott 23 



Fig. 1. — Natural size. A weathered section, showing irregailar 

 tubes radiating from what was probahly a portion 

 of the central cavity. U.S. National Museum, Cata- 

 logue No. 58317. Geological Survev, Canada, Cat- 

 alogue No. 8059d. 



Atikokania LAwsONi Walcott 23 



Fig. 2.— Natural size. Polished section of a piece of limestone 

 where the radiating tubes are cut across, at difierent 

 angles. The sections of the tubes on the right half 

 are nearly at right angles to the tubes, while those 

 on the left are more or less oblique. All of the 

 sections of the tubes appear to baye been more or 

 less disturbed by the compression of the limestone 

 in which they are embedded. U.S. National Museum, 

 Catalogue No. .58316. Geological Survey, Canada, 

 Catalogue No. 8059e. 



Cryptozoan ?? sp. undt 2.3 



Fig. 3. — Natural size. Photograph of a thin section of what 

 may be a form allied to the Prc-Cambrian Crypto- 

 zoan of the Grand Canyon section of Arizona. U.S. 

 National Museum, Catalogue No. 58318. Geological 

 Survey, Canada, Catalogue No. 8059^ 



