100 



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

 from 4 to 8 inches in 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 1 

 inches in 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 

 7 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. 



LlCROPHYCUS MINOR. (N. Sp.) 



Fig. 88. 

 Fig. 88. Licrophycus minor. 



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

 branching 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 allied 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. 



