52 
Figure 1. 
Figure 2. 
Figure 3. 
Figure 4. 
Figure 5. 
Figure 6. 
Figures 1 
Plate VII. 
Strophomena wlnchelli Hall and Clarke. (Page 24.) 
A specimen retaining both valves, viewed from the 
brachial side. One-half larger than natural size. No. 4382. 
Raftnesquina camerata (Conrad). (Page 21/) 
Interior of a brachial valve, showing muscle-scars and 
pustulose surface. From the Collingwood at Craigleith, Ont. 
Natural size. No. 32'58. 
Strophomena filitexta Hall. (Page 24.) 
An interior, showing the large muscle-scars. For com- 
parison with S. trilohata. No. 1156a. 
Strophomena foveata (Raymond). (Page 23.) 
The brachial valve of the holotype from the middle 
Trenton at Peterborough, Ont. One-half larger than natural 
size. No. 3260. 
Rafinesquina prwoursor Raymond. (Page 22.) 
A pedicle valve (the holotype) from the upper part of 
the middle Trenton at Trenton, Ont. One-half larger than 
natural size. No. 3259. 
Strophomena trilobata (Owen). (Page 22.) 
A slab with two pedicle valves seen from the interior and 
two brachial valves seen from the exterior. From the Cobourg 
at Picton, Ont. Natural size. No. 3261, 
, 8. Pleetambonites youngt Raymond. (Page 24.) 
Opposite views of the holotype, from the lowest Trenton 
at the “ Natural steps above Montmorency falls, Que. 
Twice natural size. No. 325'0. 
