EXPLANATION OF PLATE XXVIII. 



TEREBRATULA HARLANI Morton, p. 357 



1-3. Three views of a very perfect specimen of the typical form. 



Vinccntown formation; near New Egypt. 



4-6. Three views of a specimen belonging to the variety fragilcs. 

 Same locality. 



7. Internal cast of pedicle valve. 



Vincentoivn sand; near Deal, {122}. 



8. The brachidium. (After Whitfield.) 



TEREBRATULINA ATLANTICA (Morton), p. 360 



9-10. Two views of a nearly perfect internal cast. 

 11-22. Two views of a similar but somewhat larger individual. 

 Manasquan marl; Farmingdalc, (138). 



936 



