EXPLANATION OF PLATE XXXIII. 
Stutchburia compressa, Morris, sp. 
Fig. 1. Internal cast of conjoined valves showing the hinge line 
Pleurophorus gregarius , Eth. fil. 
,, 2. Internal cast of a right valve. 
„ 3. Internal cast of the anterior end of the conjoined valves, showing 
the impressions of the cardinal teeth. 
„ 4. Internal cast of a left valve, with the impressions of the lateral 
teeth. 
„ 5. Similar to Fig. 3. 
Mytilops ? ravensfieldensis, Eth. fil. 
„ 6. Internal cast of a left valve. 
„ 7. Anterior end showing a cardinal fold, x 3. 
