PLATE V. 



Fig. 1. Goniobasis SlMFSOXI 



1, a. Specimen with vertical costse and revolving lines well defined. 



1, b. Magnified view of a portion of the same. 



1, c. View of a specimen with more flattened whorls and less distinct surface-markings. 



1, d. Another view of the same, showing the aperture. 



1, e. View of a specimen with more convex whorls and moderately distinct surface-marl 

 Fig. 2. Limx.ka siMir.is 



2, a. Back view of a specimen magnified two diameters. 



2, b. Another view of the same. 



3, a. Front view, natural size. 



Fig. 4. a, b. Rnvronronrs nu-n s. two views 



Fig. 5. Goniobasis AncTA.Meek 



Fig. fi. Fykgilifera humerosa 



6, a. Dorsal view of an imperfect specimen. 



6, b. Another view of the same. [Inner lip too thin and base of aperture too round.] 



6, c. A smaller specimen with more distinct nodes around the shoulder. 



Fig. 7. Planorbis spectabilis 



7, a, b. Upper views of two specimens. 



7, c. Under view of the former. 

 7,d. Profile view. 



Fig. 8. Peanorb 



8,«. Upper view. 



8, b. Profile view, sh 

 8, c. Under side, sho^ 



Figs. 9 and 10. Corbula 



Fig. 11. Unio Haydexi 



11, a. Specimen retaining most of the shell. 



11, b. Internal cast. 



Fig. 12. UXIO VETUSTA 



12, a. Side view of an Battened by pressure. 



Fig. 13. Corbula Ekgelmanni 



13, a. Side view of right valve. 



Fig. It. Limx.ka? xnii.rr.A , 



