PLATE XXX. 



PAGE 



Figs. 1, la. Tebedo vikginiana (?) Clark 160 



1. Lateral view enlarged as indicated, 

 la. End view of same specimen. 



Figs. 2, 2a, 3. Teeedo vikginiana Clark 160 



2. Lateral vie"w of small fragment of tube. Woodstock. 

 2a. End view of same specimen. 



3. Lateral vie"\v of another fragment. Woodstock. 



Figs. 4, 4a, 4b. Phenacomya petrosa (Conrad) 161 



4. Dorsal view of cast. Fort Washington. 

 4a. Same specimen as seen from the left. 

 4b. Same specimen as seen from the right. 



Fig. 5. Gastrochaena sp 161 



Cast of tube. Aquia Creek. 



383 



