49 



Gait, Rev. A. Bell, 1846-50; Elora, Dr. R. Bell, 1861 ; and Hespeler, 

 T. C. Weston, 1867. In the specimens from these localities the corallites 

 are circular in outline and closely approximated, but they are irregularly 

 disposed and do not form continuous lines or loops. The distances between 

 adjacent corallites are usually not much greater than their own diameter, 

 which averages about two millimetres. 



ZOANTHARIA. 



TETRACOKALLA. 



Pycnostylus Guelphensis, Whiteaves. 



Pycnostylus Guelphensis, Whiteaves. 1884. This volume, p. 3, pi. 1, figs. 1, la 



and lb. 



Abundant at Guelph, Hespeler, Elora and Durham ; the names of the 

 collectors of the specimens and the dates at which the specimens were 

 collected having been already given on the third page of the first part of 

 this volume. The genus Pycnostylus, of which Orthopcedium, Schluter, 

 1889, is probably a synonym, diifers from Amplexus only in the circum- 

 stance that it grows in colonies of compound and apparently fasciculated 

 corallites. 



Pycnostylus elegans, Whiteaves. 



Pycnostylus elegans, Whiteaves. .1884. This volume, pt. 1, p. 4, pi. 1, figs. 2 and 2a. 

 Hespeler, T. C. Weston, 1867 ; Durham, J. Townsend, 1878-85 ; ap- 

 parently much rarer than the preceding species. 



Zapheentis. Species undeterminable. 



Specimens of a species of Zaphrentis, which are too imperfect to be satis- 

 factorily identified, but which are apparently allied to and possibly identi- 

 cal with the Z. Bacinensis of Whitfield,* from the Niagara limestone of 

 Wisconsin, were collected at Guelph by Dr. R. Bell in 1861, at Hespeler 

 by Mr. T. C. Weston in 1871, at Elora by Mr. David Boyle in 1880, and 

 at Durham by Mr. Joseph Townsend between the years 1879 and 1882. 

 Most of these specimens from Ontario are mere casts of the interior of 

 the calyx of the coral, in a bad state of preservation. 



Cystostylus infundibulus, Whitfield. 



Syringopora infundibvla, Whitfield ... 1877. Ann. Rep. Geol. Surv. Wiscons. , p. 



79. 

 Cystostylus infundibidus,Vih\t?i(i\A .. .\%%2. Geol. Wiscons., vol. IV., p. 274, pi. 



14, fig. 7. 

 " " Whiteaves.. .1874. This volume, pt. 1, p. 2. 



*Geology of Wisconsin, vol. IV. (1882), p. 277, pi. 14, figs. 1 and 2. 



