﻿206 Canadian Becord of Science. 



and seem to \\a\e occasioual spaces in them which may 

 have been communicating pores or orifices.-^ 



In 1885 Prof. X. H. Winchell recognised a similar 

 structure in stromatoporoid forms found in a limestone 

 underlying the St. Peter sandstone, and therefore of Upper 

 Cambrian age. These are noticed in his 14tli Annual 

 Keport under the name Cryptozoon Minnesotcnse, and are 

 stated to difter from Hall's specimens in their habit of 

 growth, the laminae being convex or conical upward. The 

 structure also is somewhat diflerent, the lamination being 

 much finer. 



In 1889 the Minnesota specimens were again noticed 

 by Mr. L. AV. Chaney, more especially with reference to 

 the great size attained by some of them, though there 

 seemed to be doubt as to whether the very large specimens 

 may not have been enlarged by aggregation of. concre- 

 tionary matter. In this paper also, the discovery of 

 Cryptozoon in the calciferous of the Champlain Valley, by 

 Prof. H. M. Seely, is mentioned. 



About this time I had obtained from the Calciferous of 

 Lachute, P.Q., a large stromatoporoid mass, and in examin- 

 ing it microscopically found that, though less perfectly 

 preserved than Hall's specimens, it might be referred with 

 probability to the same genus. The lamina? are more 

 waved, and often connected with each other, and the 

 canals less curved and more frequently expanding into 

 irregular cavities. I cannot positively affirm that this is 

 a distinct species, but may provisionally name it C. 

 Lachutense. 



In 1890, the Cryptozoa of the calciferous of the Cham- 

 plain Valley are referred to by Messrs. Brainard and Seely, 

 and one species is named C. Stceli, in honour of Dr. Steel, 

 who first observed them in 1825."' This species is stated 



1 Thin horizontal sections of the laminae in the best siierinieus indeed appear as if 

 constitntiiig a reticulated mat, more dense than that seen in the intermediate layers. 



2 Bulletin Geol. Socy. of America, Vol. I, p. 502. 



