PLATE 3 



Page. 



Fig. 1. Inoceeamus oblongus 285 



a. Side view of left valve ; diameter reduced one-quarter. 



b. Dorsal view of the same. 



Fig. 2. Ostkea (Alecteyonia) sannionis 277 



a. Upper valve ; exterior view. 



b. Lower valve ; interior view. 



c. Lower valve ; exterior view. 



d. Upper valve ; interior view. 



e. Exterior of the same. All natural size. 



