PLATE XXII. 



PAGE. 



AVICULOPECTEN spiNULiFEBUs Meek and Worthen 11 



Fig. 1. View of left valve, natural size. 



AVICULOPECTEN EDWABDSi Worthen 119 



Fig. 2. View of right valve, natural size. 



AVICULOPECTEN ELSAHENSIS Worthen 115 



Fig. 3. View of left valve, natural size. 



AVICULOPECTEN MACWHOKTEBI Worthen 118 



Fig. 4. View of left valve, natural size. 



AVICULOPECTEN HAKDINENSIS Worthen 117 



Fig. 5. View of left valve, natural size. 



Fig. 5 a. Fragment of the test magnified 2X. 



AVICULOPECTEN OKESTES Worthen 112 



Fig. 6. View of left -valve, natural size. 



LIMA CHESTEBENSIS Worthen 120 



Fig. 7. View of right valve, natuial size. 



AVICULOPECTEN MONBOENSIS Worthen 114 



Fig. 8. View of left valve, natural size. 



Fig. 8 a. Fragment of the test magnified 2X. 



AVICULOPECTEN MAZONENSIS Worthen 117 



Fig. 9. View of left valvo, natural size. 



AVICULOPECTEN NIOTENSIS Worthen 113 



Fig. IV. View of left valve, natural size. 



AVICULOPECTEN TALBOTI Worthen 114 



Fig. 11. View of left valve, slightly enlarged. 

 Fig. 11 a. View of same, natuial size. 



AVICULOPECTEN MENABDI Worthen 120 



Fig. 12. View of right valve, natural size. 



