346 Fossils of the Calciferous SandrocJc. 



ZOOPHYTA. 

 Petraia minganensis. 



At Romain's Island, one of the Mingan Islands, several 

 fossils have been collected, which appear to be casts of the inte- 

 rior of the cup of a large species of Petraia. The specimens are 

 cylindrical, obtusely pointed, and slightly curved at one end. 

 They are deeply striated longitudinally as if by the sharp edges of 

 the radiating lamella of a coral of the genus Petraia. There 

 are from five to seven striae in the width of three lines, and 

 therefore, in a specimen one inch and-a-half in diameter, there 

 must have been about one hundred and twenty radiating septa. 

 They appear to be the casts of the interior of a coral, in which 

 the cup extended nearly to the base. In Petraia profunda, 

 (Conrad) the characteristic species of the Black River limestone, 

 we have an analagous form in which the depth of the visceral 

 cavity is nearly equal to the total length of the coral. Although 

 it is not yet quite certain that these fossils are the casts of corals, 

 yet, as their form and so much of the structure as is indicated by 

 the markings of the surface render it highly probable that such 

 are their relations, I shall provisionally place them in the genus 

 Patraia. 



The specimens to which the above description refers are from 

 three to seven inches in length, and about one inch and a half in 

 diameter, but there are fragments that must have belonged to 

 individuals at least two feet lon^ and more than three inches in 

 diiameter. 



Locality and Formation. — Mingan Islands in the Gulf of the 

 St. Lawrence, Calciferous Sand-rock. 



Collectors. — Sir W. E. Logan and J. Richardson. 



Stenopora fibrosa* (Gold fuss, sp.) 



Small cylindrical stems, several inches in length, and from 

 three to five lines in diameter. They are, I have no doubt, spe- 

 cimens of Stenopora fibrosa, although I have not been able, as 

 yet, to detect the cells. They are replaced by chert. 



Locality and formation. — Mingnan Islands, Calciferous Sand- 

 rock. 



Collectors. — Sir W. E. Logan, J. Richardson. 



*This species has been heretofore called Monticulipora dendrosa by me. 

 On comparison I do not think we can distinguish it from Stenopora 

 fibrosa, the European form. It is the branched variety of Chatetes lyco- 

 perdon figured in the Palaeontology of New York. 



