THE DEVONIAN LIMESTONE AT ST. GEORGE, QUEBEC 219 



Cyathophyllum sp. 



Great numbers of corals belonging to this genus occur at this 

 locality, but none of them shows specific characteristics. It is prob- 

 able that two, or even more, species are represented in the collection. 

 Cystiphyllum vesiculosum (Goldfuss)^ 



One specimen only of this species was collected. It is typical in 

 all respects, except that it is not complete enough to show the calyx. 

 Zaphrentis Rafinesque and Clifford sensu stricto^ 



One specimen of a Zaphrentid coral with a well-developed 

 fossula, and with septa (not carinated) extending fully to the center 

 of the visceral chamber, is present in the collection. It consists 

 of little more than a cross-section, so that nothing can be said of 

 its external form. In the collection made by Logan and examined 

 by BiUings, an unidentified Zaphrentis was listed. 

 Amplexus cf. hamiltoniae Hall. 



Two small specimens are placed provisionally in this species. 

 In both, the external ornamentation is preserved exceptionally well, 

 but almost all traces of internal structure have been obliterated by 

 the crystallization of the interior. Septa may be seen within one 

 specimen, closely crowded, and produced about a quarter of the 

 distance from the outer wall to the center, but whether these repre- 

 sent the original length, or only such parts as have escaped crystal- 

 lization is uncertain. 

 Syringopora tahulata (Milne-Edwards and Haime)^ 



This is one of the largest corals found at St. George, rivaling 

 Favosites hasalticus in size. Some of the specimens, incomplete, 

 weigh as much as 15 pounds, and are 40 cm. on their greatest di- 

 ameter. Ami has identified S. hisingeri from this locaHty, but none 

 of our forms belongs to that species. In all of our specimens, the 

 corallites are never separated by spaces greater than their own 

 diameter, and the connecting tubes are disposed at uniform levels. 

 Stromatopora Goldfuss (emend. Nicholson)^ 



' M. Edwards and Haime, "Mon. Brit. Corals," Paleon. Soc. London (1850), 

 p. 243; Lambe,-o/>. cit., Part II, p. 192. 



= M. O'Connell, "Revision of the Genus Zaphrentis," Ann. of the New York 

 Acad. Sci., Vol. XXIII (1914), pp. 188-89. 



3 C. Rominger, Geol. Surv. Mich., Vol. Ill (1876), Part II, p. 84. 



4 H. A. Nicholson, "Mon. Brit. Stromatoporoids, Paleon. Soc. London (1886), p. 91. 



