PLATE I. 



Page. 



Terrbratella Vanuxemi Lyell and Forbes 14 



Fig. 1. Dorsal view of a specimeu wliicli is rather coarsely plicated. 



2. Profile view of the same. 



3. View, eularged one and a half diameters, of a finely plicated form. 



4. A ventral valve showing bifurcating plications. 



Terebhatella plicata Say 12 



Fig. 5. Dor.sal view of a large individual. 



6. Profile view of the same. 



7. Ventral view of a different individual of large size. 



8. Enlargement of the hinge jiortion of the last one to show the form of the foramen 



and plates. 



9. Enlarged view of a dorsal valve showing the loop and its connection. 

 Terebratulina Atlantica Morton 9 



Fig. 10. Dorsal view of a cast showing very tine striae and a flattened dorsal valve. 

 11. Copy of Conrad's figure of T. glossa. 

 1'2. Profile of a smaller crushed specimen. 

 13. Dorsal view of a specimen from Farmingdalc, N. J. 



Terebratulina lachryma Morton 12 



Fig. 14. Enlarged dorsal view of a specimen from Charleston, S. C, introduced for com- 

 parison with the last. 



Terebratl'LA Harlani var. fkagilis Morton 7 



Fig. 15. Dorsal view of a cast of a young shell showing the strong iilications at this age. 



16. Profile view of the same. 



17. Dorsal view of a specimeu of the normal form. 



IS. Dorsal view of a iiartiiil cast showing an extremely narrow form. 



Terebratula Harlani var. pero valis Morton 8 



Fig. 19. Dorsal view of a half-grown shell of T. Harlani possessing the features ascribed 

 to this variety. 



TEKEBI5ATULA Harlani Morton 8 



Figs. SO-22. Three views of a full-grown specimen from near New Egypt, N. J., showing 

 the absence of plications which are sometimes very distinct in as large ones 

 as this. 

 23. View of the interior of the dorsal valve with the loop attached. The figure is 

 restored from several specimens, but not exaggerated. 



270 



