wavy, coarse, irregular; texture, tough; the stone admitting of 

 working and polishing as a marble. The exceeding massive- 

 ness and broad lamination especially characterize the species. 



Horizon. B Chazy. 



Illustrations. Massive fossil in wall of quarry. Plate 

 LXIX. Entire specimen, reduced Plate LXXII, upper figure. 

 Part of the above natural size showing coarse, irregular lamina- 

 tion. Plate LXXII, lower figure. Microscopic view. Plate 

 LXXIV, Fig. I. 



This may be the proper place to call attention to the fact that 

 while the forms S. Eatoni and S. laniottense have thus far been 

 observed only on Isle La Motte the genus Stromatocerium exists 

 in the Chazy rocks at other localities. The examples so far col- 

 lected have come from the horizon that has afforded S. la/nottetise 

 Middle B. Chazy. They have been obtained along the Valley of 

 Champlain from Basin Harbor, Vt., Appletree Point, Vt., South 

 Hero, Vt., and from the classic ground the Fisk Farm, Chazy, 

 N. Y. These localities, paiticularly Chazy, N. Y., have yielded 

 hemispherical masses of the shape of the old time straw beehive 

 though much smaller in size. These examples so differ from S. 

 I'ugosum^ S. Eatoni^ and 5*. latnoiiense in size, in manner of 

 growth, in lamination, that they seem almost to demand a specific 

 position. A valid species they may prove to be. But until the 

 fields can be more carefully gleaned, and the examples more fully 

 assembled and compared, it may be best to accord to them only a 

 varietal place. 



The form mav have a provisional name. 



Stromatocerium lamottense var. ciiazianum. 

 PI. LXXIII, upper figure. 

 A stromatoceroid fossil mostly hemispherical in form, distin- 

 guished from S. rugosuin by its greater size, and less rugose char- 

 acter ; from S. Eatoiii hy its compact mode of growth, from S. 

 lamottense by its inferior size and its finer lamination. 

 Horizon. B. Chazy. 



Localities. Basin Harbor, Vt. Appletree Point, South Hero, 

 Vt. Chazy, N. Y. 



