100 



thickness, and gently curved from the centre outwards, forming a tuft 

 from 4 to 8 inches m height and about the same in the greatest width. 

 In the best preserved specimen observed, the original stem is cylindrical, 

 and about 4 lines in thickness at the base, where it is broken off. At IJ 

 inches ia height, it is 9 lines in diameter, and here consists of a bundle of 

 from 20 to 30 stems closely aggregated into one solid cylindrical mass. 

 The stems then separate and curve gracefully outwards, forming a tuft 7 

 inches wide at the height of 4 inches. The length of the whole is about 

 T inches. The stems have a smooth sub-cylindric aspect, and appear to 

 have been of a succulent or soft structure, so that, when thrown down and 

 buried in the sediment, they were pressed and partly blended into each 

 other. 



This is a very striking, easily recognized, and persistent species. Speci- 

 mens from Ottawa, where it is most abundant, may be identified at the 

 first glance with those from Peterboro. 



Locality and Formation. — City of Ottawa, Peterboro, and Belleville. 

 Trenton limestone. 



Collectors. — E. Billings, M. Rogers. 



LiCROPHTCUS MINOR. (N. Sp.) 



Fig. 88. 

 Fig. 88. — Licrophycus minor. 



Description. — In this species the stems are about one line in thickness, 

 branchmg at an acute angle, straight or curved. Length, 3 or 4 inches ; 

 width, across the whole tuft, from 1^ to 2 inches. It is closely alHed to 

 L. Ottawaensis, but is much smaller, and in general the branches are 

 straighter, and appear to have been of a more firm consistence, as they 

 are not so much compressed. 



Locality and Formation. — City of Ottawa ; in the Trenton limestone. 



Collector. — E. Billings. 



