126 



Heliophyllum conflukns. Hall. (Fig. 8.) (111. Dev. 

 Foas. Corals., PI. XXVI.) 



Distinguishing ( 'haracters. — Compound or confluent 

 growth, often forming heads of considerable size: strongly 

 wrinkled peritheca surrounding the colony, and the free 

 parts of individual corallites where separated; moderately 

 deep calicos ; well-developed carinated septa. 



Found only in the Encrinal limestone, on the Lake Shore. 

 (Also at Morse Creek. ) It is rare. 



Genus CYSTIPHYLLUM. Londsdale. 



[Ety. : Kustis, cavity: phyllon, leaf.] 

 (Murch. Sil. Syst.. p. 691, 1839.) 



Chiefly simple coralla, varying in outline from depressed 

 turbinate to cylindrical; often irregular in growth. Septa 

 rudimentary and frequently obsolete, the 

 floor of the calyx being formed by the upper 

 portion of the vesiculate filling. Entire 

 interior of corallum filled with vesicular 

 tissue, disposed in more or less regular series, 

 and presenting in section a rough tabulate 

 appearance. An epitheca is present. Fre- 

 quent constrictions occur in some forms, 

 indicating periodic rejuvenation. 



Cystiphyllum conifollis. Hall. (Fig. 9.) 

 (Pal. N. Y. 111. Dev. Foss., PL XXX., Figs. 3-<>. ) 

 Distinguish ing Ch;i meters. — Slender cy 1 i n - 

 drical form; irregular, intermittent growth; 

 coarse wrinkled epitheca; moderate-sized 

 cysts arranged in a cup-like manner ; .rather 

 shallow calyx with simulation of septa by 

 the radial arrangement of the cysts. 



Found in the coral layer of the lower Moscow shales, at 

 Sections 5, ('). 7; also on the Lake Shore. Occasionally it 

 occurs in the Demissa bed. 



CYSTIPHYLLUM AMERICANUM. F. andH. (Fig. 10.) (Pol. 

 Loss. d. Terr. Pal., p. 464.) 



Fig.9. ('i/sti/ilti/l- 



I II III CD II if <) II is, 



showing the pre- 

 vailing form and 

 irregularities 



lafter Hall). 



