1899] Lambe— Canadian Paljdozoic Corals. 225 



formation of a new cell from within. The calyces are moderately 

 deep, uniformly spreading from an obtusely angustated bottom; 

 margins erect : their surface is blistered, and is radially striate 

 by spinulose crests, developed in some specimens with more 

 distinctness than in others, The surface of the polyp stems ip 

 well-preserved condition is longitudinally ribbed by septal striae, 

 but it often happens that the outer walls are destroyed, and that 

 the stems are of rough exfoliated aspect, exhibiting the concave 

 side of the blisters composing the cell cups, and the free edges 

 of the single invaginated cups composing the stems." 



Cystiphyllum AGGREGATUM, Billings. 



Cystiphylluin aggregatum, Billings. 1859. Canadian Journal, new 

 series, vol. IV, p. 137, fig. 28. 



" aggyegatuni, Rominger. 1876. Geol. Survey Michip 



gan, Fossil Corals, p. 138. 



" c(2spitosuni, Schluter. 1882. Sitzungsberichte d^ 



niederrhein. Gessellschaft fur Natur-u. Heilkundfe 

 in Bonn ; and 1889, Anthozoen des rheinischen 

 Mittel-Devon, band viii, heft 4, p. 86, pi. Vlli, 

 figs. 1—3. 



Original description. — " The only specimen of this very 

 distinct species that has come under my observation is in the 

 cabinet of the Canadian Institute. It consists of a mass of 

 cylindrical corallites closely aggregated and in places united by 

 projecting folds of the outer wall, as in the genus Eridophyllum. 

 The individuals are completely enveloped in a thin epitheca 

 which is obliquely wrinkled and filled with small sublenticular 

 cells, one or two lines in width, Diameter of longest corallite it) 

 the group, one inch, and of the smallest, five-eights of an inch." 



Since the above was written a number of very fine specimens 

 of this species, some of them of large size, have been added to 

 the collection of the Geological Survey, therefore it is thought 

 desirable to amplify the original description by the following, 

 the result of an examination of the additional material — Coral^ 



