PLATE XXIII. 



Figure I. Rota! in hyramrnsif: Cushman, n. sp. Ventral view. X 80. 



2. Rolalia dcniala Parker and Jones'.' Dursal view. X 80. 



3. Nonionina umbilicat>il(i (Montagu I Parker, Jones, and II. B. Brady. Side view. X 80. 



4. Nonionina iimbiliraliihi iMontacni Parker, .Tones, and II. B. Brady, .\pertnral view ofa nother sjx'cimen. 



X 80. 



5. Nonionina scaphn (Fichtel and Moll) Parker and Jones. Apertural view. X 80. 



6. Nonionina scapha (Fichtel and Moll) Parker and Jones. Side vdew of anotlier Ki)ecimen. X 80. 



7. Nonionina scapha (Fichtel and Moll) Parker and Jones. Side view of a larger, more elongate speeimen. 



X 80. 



117 



