126 ON THE FOSSIL CORALS OF THE 



Locality and formation. — Lot 19, con. 3, "Walpole and Eama's 

 farm. Corniferous. 



HELiOPHTLiiUM Halli. — (Edwards and Haime). 



H. Halli. — Edwards and Haime, Polypiers Jfossiles, p. 408, pi. 7, 



Eig. 6,Ga,6 b. 



Corallum, turbinate or cylindro- conic, in general somewhat elon- 

 gated and curved at tlie base, surrounded by an epitheca and some 

 folds of growth. Cup circular moderately deep ; a small septal 

 fossette ; radiating septa about eighty ; arched ridges and septal 

 spines half a line distant from each other. Length from one to five 

 inches ; diameter of cup in large specimen, two inches and a half. 



This species is closely allied to I£. Canadense, but differs in having 

 the septal spines closer together, and the cup more shallow. The 

 specimens are often abruptly bent, and annulated with deep sharp 

 folds of growth. 



Locality. — Lot 25, con. 3, Bosanquet, Hamilton group. It is said 

 to occur in the Devonian limestone of Torquay, England. 



Heliophylltjm tenuiseptatum. — (Billings.) 



Simple, turbinate, curved, strongly annulated ; radiating septa 

 thin, and very numerous in proportion to the size, there being one 

 hundred and fifty in a specimen a little less than an inch in diameter ; 

 cup moderately deep bell-shaped; free edges of septa minutely 

 denticulated, with about seven very short spines in one line. 



The only specimen seen is one inch and one-fourth in length, and 

 eleven lines in diameter at the margin. The cup is five lines deep. 



This species differs from all the others above described, in the 

 greater number of the septa in proportion to the size. 



Locality and formation. — Lot 25, con. 3, Bosanquet, Hamilton 

 Group. 



Heliophtllitm colligatttm. — (Billings) . 



Corallum forming large masses of long slender corallites, which are 

 connected together at intervals of from two to four lines, by periodic 

 expansions of the cup ; radiating septa about fifty-two ; diameter of 

 corallites where constricted five lines ; and of the expanded cup six 

 to ten lines. Among the full grown there are interspersed some 

 that are immature and of a smaller size. The cup is shallow, the 



