PLATE XXIII. 



PAGE 



Figs. 1, la, lb. TuDiCLA marylandica n. sp 137 



Ventral, dorsal and end views. 2 miles below Potomac Creek. 



Figs. 2, 2a. Tudicla sp 138 



Ventral view. Crownsville. 

 End view of the same sj)ecimen. 



Fig. 3. Levifuslts teabdatus ( ?) Conrad var 139 



Cast. Woodstock. 



Fig. 4. Tudicla (?) sp 138 



Cast. Aquia Creek. 



Fig. 5. Metula marylandica n. sp 139 



Ventral view of type specimen. 2 miles below Potomac Creek. 



Fig. 6. Chrysodomus engonatus (Heilprin) 140 



2 miles below Potomac Creek. 



Fig. 7. PsEUDOLiVA sp 140 



Cast. Upper Marlboro. 



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