14 
18 
27 
38 
39 
Nucula Rugulosa, p. 171 
Convexa, p. 172 
Pisum, p. 172 
Exigua, p. 172 




Patagonica, p. 167 

Thraceformis, p. 
169 


Tenuisulcata, APP. 

Pygmeea, APP. 
Unio Siculus, app. 
Perdix, p. 188 
Hopetonensis, p. 198 


— Cariosus, p. 190 

Circulus, p. 201 
4 —— Obliquus, p. 186 

Irroratus, p. 181 
—— Undulatus, p. 175 
—— Tuberculatus, p. 182 

Intermedius, App. 
— Celatus, p. 175 

Cornutus, p. 179 
——. Cylindricus, p. 182 
—— Pliciferus, p. 176 
Semigranosus, APP. 
Subtentus, p. 176 
— Multistriatus, p. 176 
Tampicoensis, p. 188 
Gracilis, p. 174 
— Lachrymosus, p. 177 





Compressus, p. 174 
Delphinodonta, app, 
19 
40 Unio Fragosus, p. 178 



41 Breyidens, p. 198 
42 Tenuissimus, p. 206 
43 Ovatus, p. 184 
44 ——— Delphinus, app. 







45 —— Pyramidatus, p. 186 
46 —— Crassidens, p. 184 
47 —— Ebenus, p. 202 
48 Ochraceus, p. 190 
49 —— Ceruleus, p. 194 
50 —— Phaseolus, p. 207 
51 Securis, p. 184 
52 Clavus, p. 187 
53 Marginalis, p. 206 
54 —— Gibbosus, p. 207 
55 —— Splendidus, p. 190 
56 —— Egyptiacus, p. 198 
57 Collinus, APP. 
58 Subrotundus, p. 203 
59 Ravenelianus, p. 187 
60 Lanceolatus, p. 204 

PLATE XXI. 
Unio Cooperianus, p. 180 
Orbiculatus, p. 192 


ui 
2 
3 Paranensis, p. 202 
4 —— Lens, p. 201 
5 
6 
(i 

Capseeformis, p. 191 

Trigonus, p. 185 
—— Ellipsis, p. 188 
