PLATE 24. 
Page. 
Gael UNTO CR VP TOREWN CHUS eee reece slaseaee ater cere Sele meioe Sie 68 
a, Exterior view, right valve, of 1 broken example; natural size. 
b. Interior view of the same, showing the hinge. 
Fig. 2. ANODONTA PROPATORIS ......--- ANBAR e HS MoO oro mrnecaoosTodcds 61 
a. Left side view of a natural cast of the interior; natural size. 
b. Left side view of a young example. 
ce. Dorsal view of the same. 
d. Fragment of left valve, showing the hinge. 
Fig. 3. ANODONTA PARALLELA ..---...-..- Delete wens asta None eel o saa aay 62 
a. Restoration figure from fragments of right valves; natural size. 
Hen 4) (PHYSAY COPED. 6252 2.00 a UT UN eae ec 
a. Side view; natural size; the outer labial portion restored. 
b. Apertural view of the same. 
BiGs 05 -DULINUS ATAVUS {lis oS ea ae iray alates een aseyere per eiereie RSs is seean A 86 
a. Side view; natural size. 
b. Apertural view of the same. 
HIG NG: YBULENUS DISJUNCLUSsoaceeisese asec eee eciee e eee oe Eee ee eenee 86 
a. Side view; natural size; showing the disjoined and flexed portion 
of the inner lip. 
b. Apertural view of the same. 
