19 



Rafinesquina cf. alternata (Emmons). 



Strophomena planumbona Hall, S. rugosa Blainville. 



Zygospira modesta Hall. 



Cyclonema bilix Conrad. 



Lophosira bowdeni (Safford). 



Lophospira sp. nou. 



Oxydiscus sp. 



Schizolopha tropidophora (Meek). 



Schizolopha moorei Ulrich. 



Byssonychia grandis Ulrich. 

 Byssonychia radiata (Hall). 

 Byssonychia richmondensis Ulrich. 

 Cymatonota typicalis Ulrich. 

 Modiolopsis concentrica Hall and Whitfield. 

 Modiolopsis cf. versaillensis Miller. 

 Opisthoptera casei (Meek and Worthen). 

 Pterinea demissa (Conrad). 



Lorraine Formation. 



Below th: po!n first described the slant of the river 

 bed causes an increasing thickness of the underlying Lor- 

 raine to be revealed. Excellent exposures are presented 

 near the bridge on the road between Streetsville and 

 Streetsville Junction, and also immediately above the 

 railway bridge. The section at the former point is as 

 follows : — 



Richmond — 



1. Corralline limestones and shales 18 ft. 5 -4m. 



2. Grey, thin-bedded limestone and shale .3 ft. -9 m. 



3. Compact bryozoan limestone 1 -6 ft. -35 m. 



Lorraine — 



4. Grey shale and thin-bedded limestone 3 ft. -9 m. 



5. Sandstone 4 in. 10 cm. 



Nos. 1 and 3 contain the typical gastropod, 



brachiopod and pelecypod fauna. 

 No. 2 is characterized by the presence of Byssonychia 



richmondensis, Ulrich. 

 No. 4 contains scarcely any organic remains. 

 35066— 2\ 



