i 



i :m 





20G 



Canadian licciml of Scicurc. 



and seem to liuve occasional spaces in llieni vvliicli may 

 liave been communicating- pores or oritices.' 



In 1885 Trot". X. H. Wincliell recognised a similar 

 structure in stromatoporoid forms Found in a limestone 

 uiulerlyinj^' the St. I'eter sandstone, and therefore of I'pper 

 C'amhrian aj^e. These are noticcMl in his 14th Annual 

 Report under the name Criijitozoon Minitfuotcnsc, and are 

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

 •growth, the lamina' being convex or conical upward. The 

 structure also is somewhat dillerent, the lanunation beint;' 

 much finer. 



In 1889 the Minnesota specimens were again noticed 

 by ^Ir. L. W. Chancy, more esjtecially with reference to 

 the great size attained by some (»f 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 pajter also, the discovery of 

 Cryptozoon in the calciferous of the Champlain Valley, by 

 l*rof. H. ]\1. Seely, is mentioned. 



About this time 1 had obtaineil from the Calciferous of 

 Lachute, 1*.Q., a large stromatoporoid mass, and in examin- 

 ing it microscojucally 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 (J. 

 Lachutense. 



In 1890, the Cryptozoa of the calciferous of the ( "ham- 

 plain Valley are referred to by Messrs. ]>rainard and Seely, 

 and one species is named 6. Stccli, in honour of I^r. Steel, 

 who first observed them in 1825.^ This species is stated 



I Tliiii tioi'izontiil sections of Uiu laininii- iii Uie best spcriiiieiis iiulecU ni>|>t>nr as if 

 constituting ii reticttiiitted mat, more dense than tliiit seen in tlie intennediate layers. 

 a Bulletin Geol. Socy. of .Vnieiicii, Vol. I, i>. 502. 



