lAMBE.] CANADIAN PALEOZOIC CORALS. 193 



obliquely outward and upward to the periphery ; at the centre of the 

 visceral chamber the vesicles are more nearly horizontal and as a rule 

 larger than the others. 



" This species is very variable in shape and size, sometimes in the stout, 

 short forms reaching a diameter of over 1 cent, with a length of about 

 27 cent., in the slender forms an equal length may be attained with a 

 thickness of only 3 or 4 cent. In his description of C. Senecdense, 

 Billings mentions a variation in length from three inches to two feet, with 

 a diameter of three-quarters of an inch to an inch and a half. The same 

 authority in referring to the size of C. grande, says, ' There are fragments 

 of this species in the collection of the Geological Survey of Canada, five 

 inches in diameter ; and one specimen, still lying in the rock, is known 

 which is three feet long.' 



" Examples of twin corallites with a common epitheca are not infre 

 quent. 



"Locality. — Abundant in the Corniferous and Hamilton formations of 

 Ontario." (Lambe, 1899.) 



Cystiphyllum aggeegatum, Billings. 

 Plate XVIII., fig. 3. 



Cystiphyllum aggregatmn, Billings. 1859. Canadian Journal, new series, vol. IV., p. 



137, fig. 28. 

 ? Cystiphyllmn fruticosum, Nicholson. 1875. Geological Magazine, new series, vol. II., 



p. 32, pi. I., figs. 3, 3a ; and 1875, Pateon. of Ont., p. 73, pi. I., 



figs. 3, 3a. 

 Gystiphyllum aggregatum, Eominger. 1876. (ieol. Sur. Mich., Foss. Corals, p. 138. 

 Cystiphyllum ccsspitosu/m, Schluter. 1882. Sitzungsberichte der niederrhein. Gessell- 



sohaft fur Natur u. Heilkunde in' Bonn; and 1889, Anthozoen 



des rheinischen Mittel-Devon, band VIII., heft 4, p. 86, pi. 



VIII., figs. 1—3. 

 Cystiphyllum aggregatum, Lambe. 1899. Ottawa Naturalist, vol. XII., p. 225. 



"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 

 SridopfiA/llum. 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 in the group, one 

 inch, and of the smallest, five-eighths 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 



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