108 



This species must be closely allied to the well known 0. articulatam of 

 the Upper Silurian rocks of Europe, but differs therefrom in not being so 

 strongly annulated, and in exhibiting a tendency to form connections be- 

 tween the corallites by the development of small radiciform projections, as 

 in the genus Eridophyllum. 



The colonies are large, and when split open, the long, slender, cylindri- 

 cal, and parallel corallites (which are always in contact with each other or 

 very nearly so,) present an aspect very like that of some species of De- 

 vonian corals from Canada West, such as Diphyphyttum arundinaceum. 



Locality and Formation. L'Anse a Gascon, Bay of Chaleurs : Middle 

 Silurian. 



Collector. Sir W. E. Logan. 



CYATHOPHYLLUM WAHLENBERGII. (N. sp.) 



Description. Corallum aggregate, growing in colonies one foot or more 

 in diameter ; composed of numerous long cylindrical corallites, three or 

 four lines in diameter, and either closely crowded together or separated 

 from one to four lines. The young branch from the sides of the adult, 

 and are at first very slender, but reach the full size at a length of one or 

 two inches. The corallites are annulated with numerous irregular constric- 

 tions, often with sharp-edged elevations between. There appear to be 

 about 60 radiating septa, which do not quite reach the centre. In weath- 

 ered specimens the interseptal spaces are seen to be divided into oblong or 

 square cells by very thin transverse septa. 



Resembles 0. articulation (Wahlenberg), but is a smaller species. It 

 is larger, and more strongly annulated than 0. fiexuosum (Lonsdale). 



Locality and Formation. East Point, Anticosti ; in division 3, Anti- 

 costi group, Middle Silurian. 



Collector. J. Richardson. 



CYATHOPHYLLUM PELAGICUM. (N. sp.) 



Description. Corallum aggregate ; forming large colonies, from 6 to 15 

 inches in diameter, consisting of long slender cylindrical corallites, 3 or 4 

 lines in thickness, closely crowded together. Radiating septa about 60, 

 of an alternating size, the small reaching and the larger the distance 

 from the outer wall to the centre. Central area about one-third the whole 

 diameter ; crossed by thin, often flexuous, transverse diaphragms, of which 

 there are 2 or 3 in one line. The inner wall is thin, and the radiating 

 septa seem to be abruptly terminated by it. The young corallites bud from 



