127 



Distinguishing ( 'har- 

 acters. — Elongated, cyl- 

 i n (1 r i c o - 1 u r b i n a t e , 

 straight or slightly 

 curved form; thin, but 

 strongly wrinkled, epi- 

 theca ; moderate depth 

 of calvx, with faint in- 

 dications of septal ridges 

 about its sides ; irregular 

 vesicular tissue, dense 

 near the wall, coarser 

 near the center. 



Found in the coral 

 layer and above it in the 

 lower Moscow shales, at 

 Section 5. 



Cystiphyllum 

 ans. Hall. (Fig, 

 (Ill.Dev.Foss.,pl. 

 1876.) 



Distinguishing Charac- 

 ters. — Irregular cvlindri- 

 cal or conical form, vary- 

 ing greatly; coarse, 

 wrinkled epitheca, which, near the base, is 

 often produced into irregular projections 

 which serve to cement the coral to a shell 

 or other foreign object; moderately deep 

 funnel-shaped calyx, its floor formed by 

 the upper surfaces of the cysts, septa in 

 the form of radiating ridges. Interior 

 structure cellulose, the cysts of moderate 

 size and arranged in cup-in-cup manner. 



Found in the Hamilton group of Eigh- 

 teen Mile Creek. (Coll. Am. Mus. Nat. 

 Hist. New York.) 



V A R I - 



10A.) 



Fig. 10. Cystyphyllum americanum, a specimen 

 from the coral layer of Section 5. Natural size. 

 Stud. Pal. Coll. Harv. Univ. Cat. 233. (Original.) 



Fig. 10A. Cystiphyllum 

 various, a small specimen 

 (after Hall). 



