556 
FIG. 
Fia. 
Fie. 
lig. 
FIG. 
Fic. 
Fig. 
Fig. 
Fig. 9 
Fig. 
Fig. 
FIG. 
Fig. 
GEOLOGICAL SURVEY OF THE TERRITORIES. 
EXPLANATION OF PLATE XXI, 
. Lepidurus glacialis, female; tenth appendage. 
. Lepidurus glacialis, female ; eleventh appendage, with ovisac. 
. Lepidurus bilobatus, female; tenth appendage. 
Lepidurus couesii, male; tenth appendage. 
Lepidurus couesii, female; tenth appendage. 
. Lepidurus couesii, female; eleventh appendage. 
. Apus lucasanus, maxilla. 
. Apus lucasanus, maxilla, seen from the inside. 
. Lepidurus couesii, maxilla. 
10. Apus lucasanus, maxilla. 
11. Lepidurus couesti, mandible. 
12. Apus lucasanus, mandible. 
13. Apus lucasanus, outside view of the same specimen as Fig. 8 represents. 
DIDMP wwe 
