U. S. NATIONAL MUSEUM 



PROCEEDINGS. VOL. 90 PLATE 65 



ENCOPE MICHELINI L. AGASSIZ AND MELLITA QU I NQU I ESPERFORATA (LESKEJ. 



1, 2, Fossil specimen of E. michelini, 133 mm. long, 138 mm. wide. 



4, Fossil specimen of E. michelini, 3i mm. long, 32 mm. wide. 



3, 6, Young fossil specimen of E. michelini, 13 mm. long, 13 mm. wide. 



5, Fossil specimen of M. quinquiesperforata, 36 mm. long, 36 mm. wide. 



(All figures X ^: except 3, 5, and 6, which are X Iji) 



