""•^■J CANADIAN PALvBOZOIC CORALS. 173 



LONSDALEIA PiCroENSE, Billings. (Sp.) 

 Plate XTV,, figs. 9, 9a. 



Lithostrotion Piotoense, Billings. 1868. Dawson's Acadian Geology, second edition, p. 



286, fig. 83. 

 Lonsdaleia Pictoense, Lambe. 1899. Ottawa Naturalist, vol. XII., p. 248. 



" Gorallum compound, fasciculate, composed of long, upright, fiexuouSj 

 cylindrical corallites that increase freely by lateral calicinal gemmation, 

 and are separated from each other by spaces of variable width, though 

 frequently in contact. Corallites attaining a breadth of about 10 mm., 

 the young ones beginning with a diameter of between 2 and 3 mm. 

 Epitheca complete. Internal structure consisting of a circumferential 

 vesicular zone, in breadth equal to about one-iifth the diameter of the 

 corallite, defined within by a stout inner wall that encloses a tabulate 

 area, at the centre of which is a comparatively large columella about 1 

 mm. in thickness. From the inner wall converge short, strong, well 

 defined septa that are occasionally extended outward into the vesicular 

 zone and more rarely reach the outer wall. The septa, about twenty in 

 number, extend only about half-way across the space between the inner 

 wall and the columella ; alternating with them are observed occasionally 

 rudimentary septa which are also indicated in the outer wall in those 

 exceptional instances when the primary septa traverse the peripheral 

 vesicular area. Tabulae moderately regular, about twelve in a space of 5 

 mm., inclined slightly upward at their junction with the inner wall and 

 rising suddenly and inosculating with each other near the centre so as to 

 form the columella. Vesicles of the outer area long and narrow, formed 

 by curved plates rather unequal in size, that are directed obliquely up. 

 ward and outward, and fill the space between the two walls. 



" Represented in the collection by a small fragment, roughly 4 cent, 

 broad and over 2 cent, high, embedded in compact limestone that hides 

 the exact characters of the surface of the corallites. 



" Locality— Ea.at River, Pictou, Nova Scotia, collected by Sir J. William 

 Dawson ; Lower Carboniferous." (Lambe, 1899.) 



Genus Clisiophyllum, Dana. 1846. 



Glmopkyllvm, Dana. 1846. Am. Jour., Sci., and Arts, 2nd series, vol. I., p. 187. 



" Corallum simple, turbinate or subcylindrical. Septa numerous, well 

 developed. In the centre of the calyx is a conical or tent-shaped projec- 

 tion over which pass the prolongations of the first order of septa in 

 straight or spiral lines. Within are three concentric zones : the central 



