58 
59 
60 
CS Cb est iS Ou i Co: to) 
ee ee | 
eomoOaetanrk wworHo 
20 
Unio Obscurus, p. 194 
Cumberlandianus, p. 
195 
Mihlfeldianus, p. 196 


PLATE XXIII. 
Unio Cresserus, p. 196 
—— Glaber, p. 196 
—— Simus, p. 197 
—— Menkianus, p. 191 
Venustus, p. 192 

—— Hydianus, p. 192 
—— Pulcher, p. 193 
—— Medellinus, p. 193 
Notatus, p. 193 
—— Dorfeuillianus, p. 179 
—— Graniferus, p. 180 

—— Carbonarius,* p. 184 
Pumilis, p. 185 
Barnesianus, p. 185 
Solidus, p. 186 
—— Luteolus, p. 192 
Productus, p. 205 
—— Masoni, p. 201 
—— Involutus of Benson, 




APP. 

Ascia of Benson, APP. 
* Repeated by mistake. 
Pliciferus. 
22 
Unio Granosus, p. 182 

Conradicus, p. 176 

Dromas, p. 181 

Troostensis, p. 186 
— — Shepardianus, p. 203 
Taitianus, p. 186 
—— Kkorklandianus, p. 203 
Griffithianus, p. 199 
—— Personatus, p. 202 
—— Rotundatus, p. 201 
—— Nashvillianus, p. 193 
Fulvus, p. 200 
—— Globosus, p. 189 
—— Confertus, p. 200 
Pictus, p. 191 
Divaricatus, p. 197 
Modioliformis, p. 209 
— Hildrethianus, p. 196 
Swananoensis, p. 211 








Scobina, Benson, 
APP. 
—— Radula, Benson, app. 
Velaris, Benson, app. 

—— Corbis, Benson, app. 
(Alasmodonta) Radia- 
tus, p. 212 
—— Stramineus, p. 209 
—— Arcus, p. 207 

Is acknowledged by Lea to be an aged 
