""•E-] CANADIAN PALAEOZOIC CORALS. 137 



reaching only half way. Vesicles in a varying number of rows, generally 

 from about three to five, small and inclined obliquely upward and out- 

 ward. Tabulae placed close together, three or four to 1 mm., flat at the 

 centre but deflected at the circumference, occupying about half the 

 diameter of the corallite ; generally the disposition of the tabulas is irreg- 

 ular owing to the presence of numerous small cysts or minor vesicular 

 secondary tabulae. 



According to Billings this coral resembles C. articulatum, Wahlenberg, 

 but is a smaller species, and is larger and more strongly annulated than 

 C . flexuosum, Lonsdale. 



Locality. — East Point, Anticosti, in division Til, of the Anticosti 

 group ; collected by J. Richardson, 1856. 



Cyathophyllum inteeeuptum, Billings, 

 Plate XI., figs. 3, 3a, 36. 



Cyathophyllum interruptum, Billings. 1862. Palaeoz. Foss., vol. I., p. 109. 



Corallum apparently simple, strongly curved, with periodic enlargements 

 of growth representing successive calyces, giving the coral the appearance 

 of a number of inverted cones set one within the other ; enlargements 

 about 18 mm. apart on the concave side or inner curve. The type speci- 

 men, the only one known, is over 1 1 cent, in length and has a maxi- 

 mum breadth near the upper end of about 4-5 cent. Calyx small, but 

 moderately deep, with steep sides and flat at the bottom where it is about 

 9 mm. wide ; depth somewhat over 10 mm. Septa numerous, between 

 one hundred and twenty and one hundred and thirty, alternately long 

 and short, the longer passing to the centre, the shorter reaching about 

 half way ; in the peripheral area the septa are all thin but toward the 

 centre the larger ones are apparently thickened. Vesicular zone broad, 

 restricting the tabulse to a narrow central area 8 or 9 mm. broad. The ves- 

 icles or dissepiments filling the interseptal spaces, are small and diminish 

 slightly in size outward. Tabulse flat, their regularity of disposition some- 

 what interfered with by the septa and vesicles. Epitheca thin, showing 

 faint longitudinal septal striations and in places marked by short trans- 

 verse wrinkles that are apparently the result of a slight protrusion of the 

 epitheca by the outer edges of the dissepiments beneath. 



Locality. — L'.Anse a la Barbe, Bale des Chaleurs ; Silurian*; collector 

 Sir William Logan, 1843. 



* See foot-note on p. 129 as to age of rocks. 



