NIAGARA FALLS AND VICINITY 139 



Genus chonophyllum Edwards & Haime 



[Ety.ixovo?, a funnel; wbXXov, a leaf (septum) ] 



(1850. British fossil corals, p. 69) 



Corallum simple, chiefly consisting of a series of funnel-shaped 

 tabulae, set one into the other. On the surfaces of these, equally 

 developed septal radii extend from center to circumference ; no walls 

 or columella. 



Chonophyllum niagarense Hall (Fig. 32) 

 (1852. Pal. N. Y. 2:114, pi. 32) „ -V" i) ! 



Distinguishing characters. Irregularly v '- ,/ 

 cylindric, elongated or subturbinate form, 

 more or less expanding above; deep and 1 

 regularly concave calyx; thin denticulate 

 septal ridges, which are separated by a 

 space equal to their width; rough external 

 surface of weathered specimens. „. „„_. , ., 



* Fig. 32 Chonophyllum niagarense 



tt-j.1 r 1 1 • ,1 1 r with enlargement of interior of 



Hitherto found only in the lower part of caiyx 

 the Lockport limestone at Lockport, but probably also occuring at 

 Niagara. 



Genus diplophyllum Hall 



[Ety.: 3i-a6o$, double; <pv/dov, septum] 



(1852. Pal N. Y. 2:115) 



Corallum simple and branching, or forming compound masses of 

 loosely aggregated corallites which are cylindric, consisting of two 

 distinct parts separated by an accessory wall, the inner transversely 

 septate, the outer with fine transverse dissepiments uniting the septa 

 which are continuous to the center. Calyxes deeply concave in the 

 center, and separated from the outer portion by a distinct rim. 



Diplophyllum caespitosum Hall (Fig. 33) (1852. Pal. N. Y. 

 2:116, pi. 33) 



Distinguishing characters. Subturbinate young, and cylindric 

 adult corallites, which coalesce at intervals and increase by lateral 

 budding; cespitose or aggregated into large masses which often 

 grow from a single base; strongly costate exterior; numerous thin 

 septa, all of which reach the center. 



