PLATE 49. 



PllgC 



Figs. 1-4. Meristella meta 308 



1-4. Dorsal, ventral, profile and front views of a specimen of the ordinary size. 



Figs. 5 - 22. Meristella barrisi 304 



5 Dorsal view of a small individual. 

 6, 7. Dorsal and profile views of a very gibbous form. 



8, 9, 11. 12. Dorsal views of speciiiiens illustrating the prevailing size and forms of the species. 

 10. A ventral view of the specimen, fig. 9. 



13-15. Dorsal, profile and front views of an unusually elongated and gibbous form. 

 16 - 19. Dorsal, ventral, profile and front views of large forms, the front view offering a strong 

 contrast with fig. 16. 



20. A ventral view of a broad form of the species. • 



21, 22. Dorsal and ventral views of casts of this species. 



Figs. 23-35.* Meristella haskinsi 306 



23-25. Dorsal, profile and front views of a small lenticular form which shows little gibbosity. 



27, 26, 30. Profile, dorsal and front views of a more gibbous form. 



28, 81. Dorsal and ventral views of a larger form, showing a greater extension of beak. 



29, 32, 33. Profile, dorsal, and ventral views of a specimen of the ordinary size and form. 



34. Dorsal view of a large individual, showing the foramen and deltidial plates. 



35. Cast of a ventral valve. 



36. A dorsal view of a partial cast. The specimen is referred with doubt to this species. 



