128 ON THE FOSSIL CORALS OF THE 



directions to the contiguous corallites. There are between thirty- 

 five and forty-five radiating septa minutely denticulated or striated 

 on their edges, with from six to ten ridges or spines in one line. 

 When the cup is empty the inner surface is nearly perpendicular, 

 and vertically striated by the free edges of the radiating septa. It is 

 often filled by the rough projecting termination of the pseudo- 

 columella. 



Localities. — Lot 2, con. 4, Eainham. Corniferous. It occurs 

 also in the same formation in the State of Wisconsin. 



Phillipsastrea GiGAs. — (Dale Owen, sp. 



AsTREA GiGAS. — D. D. Owcn, geological survey of Iowa, &c., 1844. 

 p. 70, pi. 14, rig. 7. 



This species is in all respects the same as P. Verneuili, except 

 that the corallites are much larger and the arched ridges on the 

 sides of the septa more distant. The average diameter of the stars 

 is one inch in most specimens, but I have seen some that were nearly 

 two inches wide. It is not improbable that materials may yet be 

 procured to connect the two species. 



Locality. — Lots 5 and 6, in the 14th Concession of Walpole. 



Genus Clisiophtllum. — (Dana.J 



Generic characters. — The corals of this genus have the same general 

 external form as those of the genus ZapJirentis, and their internal 

 structure is also the same, except that the transverse diaphragms are 

 elevated in the centre so as to form a small conical protuberance in 

 the bottom of the cup, and further, they are enveloped in an outer 

 area composed of vesicular tissue. The septal fossette is small, and 

 in worn specimens its place is often indicated by the prominence of 

 one of the septa on the outside, which, being stronger than the 

 others, forms a longitudinal angular ridge. The cells of the tissue 

 which fills the outer area, slope upwards and outwards. 



Clisiophyllum Oneidaensie. — (Billings.) 



This species is from six inches to one foot or more in length, and 

 from one inch and a half to two inches and a half in diameter, often 

 curved more or less abruptly and in more than one direction. The; 

 purface is strongly annulated, the ridges being in general sharp- 



