PLATE 22. 
ERAT Gaye VEER SS Al STEN TEN S20 I Ia Irae MUNG ey Ma a ae antaretate eta SOUBHAe 
a. Side view of a fragment, the type specimen; natural size. 
Fie. 2. UNIO BRACHYOPISTHUS..--2.2.-.-.-2-.5.---4- Eee AONE AAR ANID ste es a, 
a. Ixterior view, right valve; natural size; but this example is not 
fully adult. 
b. Posterior view of the same; the valve having been a little dis- 
torted by pressure. 
EOS UENO PTR O ASV Se eee a ps Van ek a8 Bl Mea ne ae ese acerca eee 
a. Left valve; natural size. 
b. Right valve of another example. 
ce. Front view of another example. 
d. Taterior view of a left valve. 
Fig. 4. UNIO HOLMESIANUS ....-...-2.. .---e Cy UNS FL Seen PN EE ED SAS 
a. Left side view; natural size. 
b. Dorsal view of the same exainple. 
e. Left side view of a young example, 
d. Front view of the same. 
e. Posterior view of the same. 
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