1899] Lambe — Canadian Paleozoic Corals. 241 



an epitheca marked annularly by fine growth lines and longi- 

 tudinally by faint septal striae. Septa of two sizes alternating 

 with each other, the primaries almost reaching the centre, the 

 secondaries about half the length of the primaries, averaging in 

 number according to the size of the corallite from about forty 

 to fifty in all. Dissepiments arching upward, between the septa, 

 against the outside wall, generally in a single scries, their cut 

 edges as seen in transverse sections assuming the appearance of 

 an inner wall situate less than i mm. from the wall proper. 

 Tabulae large, numerous, stretching across the visceral chamber 

 so as to reach the dissepimental zone on either side, flat or 

 slightly concave at the centre, deflected downward near the 

 periphery, about ten occurring in a space of 5 mm. 



Locality and formatio}i. — Becscie River Bay, Anticosti, 

 division 2 of the Anticosti group, J. Richardson, 1856; according 

 to Billings the colonies measure from 6 to 15 inches in diameter. 



Professor Nicholson mentions this species as occurring 

 abundantly and in large masses in the Niagara limestone of 

 Thorold, Ont (op. cit. p. 59). 



DiPHYPHYLLUM MULTICAULE, Hall, Sp. 



Syringopora ? nmlticaulis, Hall. 1852. Palaeont. New York, vol. 

 II, p. 119, pi XXXIII, figs. 3a— g. 



EridopJiylluin Vennori, Billings. 1865. Canad. Nat. and Geol., 

 vol. II, 2nd. series, p. 431. 



DiphypJiyllum multicaule, Rominger. 1876. Geol. Surv. Michigan, 

 Fossil Corals, p. 121, pi. XLV, figs. 3 and 4. 



Corallum composed of upright, subparallel, cylindrical 

 corallites, from about 2"5 to 5 mm. in thickness, that increase by 

 lateral budding and form colonies sometimes over 12 cent, 

 hic^h and exceeding 10 cent, across. Corallites slender, fle.xuous, 

 separated from each other by spaces equal to or less than their 

 own diameters, connected at irregular and frequent intervals by 

 horizontal acanthiform outgrowths or- lateral spurs that are to 

 all appearances not solid but shew traces of vesicular structure 



