NOTES ON THE FOSSILS OF ONTARIO. 141 



intervals of rather more than half line, six or seven rows of cells in 

 half line, and seven or eight rows between any two perforations. 



3. Clathropora intertexta, Nich. Perforations large, usually about 

 a line and a half in diameter, placed at intervals of from one and 

 one third to one and one half lines, about five or six rows of cells 

 in one line, or about eight rows between any two perforations. 



Locality and Formation. — Niagara Limestone, Thorold. 



65. Ketepora asperato-striata, Hall. (i?e/. Pal. N.Y., Vol. II., 

 pi. xl. C, figs. 'lor-h.) Niagara Limestone, Thorold. 



66. Trematopora ostiolata, Hall. (Re/. Pal. N.Y., Vol. II., pi. 

 xl. A, figs. 5a-n.) Niagara Limestone, Niagara River. 



67. Fenestella tenuiceps. Hall. {Ref. Pal. N.Y., Vol. II., pi. 

 xl. D, figs. 2c^h.) 



68. Atrypa reticularis, Linn. Abundant in the Niagara Lime- 

 stone at Thoi-old. 



69. Pentamerus oblongus, Sowerby. Abundant at the base of 

 the Niagara Limestone, Thorold. 



70. Athyris intermedia. Hall. (lief. Atrypa intermedia, Hall, 

 Pal. N.Y., Vol. II., pi. xxiv., figs. 3«-/ and ia-d.) A species 

 apparently undistinguishable from this occurs commonly in the 

 Niagara Limestone at Thorold. 



71. Athyris (Atrypa) naviformis, Hall. Niagara Limestone, 

 Dundas. 



72. Ehynchonella (Atrypa) neglecta. Hall. Niagara Lime- 

 stone, Thorold. 



73. Orthis elegantula, Dalman. Niagara Limestone, Rock- 

 wood. 



74. Strophomena rhomboidalis, Wahlenberg. Niagara Lime- 

 stone, Owen Sound and Thorold. 



75. Strophomena sub-plana, Conrad. Niagara Limestone, Tho- 

 rold. 



76. Strophomena, sp. — A form very similar to, if not absolutely 

 identical with, S. punctidifera, Conrad, from the Lower Helderberg. 

 Not only is the general form and aspect of the shell the same, but 

 one specimen exhibits precisely similar punctations. 



Locality and Formation. — Niagara Limestone, Thorold. 



