PLATE 29. 
FIGHT UINTO: GONEAMBONADUS 2 coals 252 Saas arse ree ata eel sta) ate Ace e hase 
a. Left side view; natural size. 
b. Dorsal view of the same exaniple. 
These figures are partial restorations as to form, the example hay- 
ing been somewhat distorted by accidental pressure. 
HIGA2) WINEO AED RICHIE Joos SSE UN Ee i ae et ee 
a. Left side view; natural size. 
b. Dorsal view of the same.. 
Fic. 3. UNIO PRIMZVUS 
worm es pee ees eee eee eee eee eee eee ete ees ec cecs C2 oces Coee = 
a. Left side view of a small example. 
b. Interior view of another example ; both snevnem! Size. 
BGs 4 CORBUUAs UND ERE RA cays ee ay Lb een a je pneu Nas 5 
eoce cee eee ee ee scoe 
a. Right side view of a large example ; natural size. 
b. Dorsal view of the same. 
e. Left side view of a smaller example. 
d. Front view of the same. 
eand f. Side and front views of a young example, showing the man- 
ner ef formation of the first of the larger concentric valves or 
folds. 
Fic. 5. CORBULA UNDIFERA var. SUBUNDITERA ...... ---- Spa Tat AME Og a le 
a. Right side view; natural size. 
b. Lett view of the same. 
c. Dorsal view of the same. 
Fic. 6. NERITENA (VELATELLA) BAPTISTA ...-..------------+--e2- pdocke cae bc 
a. Dorsal view ; enlarged to one and a half diameters. 
b. Lateral view of the same. 
