PLATE 10 



Leptaena rhomboidalis Wilckens 



Page 45 



1-4 Cardinal and profile views of two shells of usual size 

 5, 6 Larger individuals 



Leptaenisca concava Hall 



Page 46 



7 Interior of a ventral valve, x \y z 



8, 9 Cardinal and upper views of the ventral valve showing- cicatrix of 



attachment and the umbonal distortion, x i l / 2 

 10, ii Similar views of an older shell 



Schizophoria multistriata Hall 



Page 47 



1 2-1 8 A series of illustrations showing the general character of the shells in 

 these beds. Figure 14 is an enlargement of the punctate surface 



Rhipidomella hybridoides Clarke 



Page 47 



19-28 Of these illustrations figures 24, 25, 26 are views of the same 

 shell enlarged x 2. Others are natural size 



186 



