74 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. ']'] 



PLATE 13 



Fig. I. Gypsinainhacrens {Sz\iVi\\z&). X 30. (After Brady.) 



2. Nonionina umbilicatula (Montagu). X 75- a, side view; b, face view. 



3. Polysfoinella macclla (Fichtel and Moll). X 66. a, side view; b, face 



view. 



4. Amphistegina lessonii d'Orbigny. X 30. 



5. OpercuUna barfschi Cushman, var. ornata Cushman. X 10. a, side 



view ; b, apertural view. 



6. Hctcrostcgiiia dcprcssa d'Orbigny, young specimen. X 35- 



