222 BULLKTIN 31 225? 



PLATE 21 

 Figure Page 



1-7. Glycymeris trigonella Con 49 



Fig. I, II mm., Claiborne saiid. 



2, 10 mm., Claiborne sand. 



3, var. minor, 14 mm., Claiborne sand. 



4, (young), 5 mm., Claiborne sand. 



5, a, var. wautubbeana, 8 mm., Mississippi var. 



6, var. minor, 9 mm. , Claiborne sand. 

 6, the same, 10 mm. 



8-10. Glycymeris sabinensis, n. sp 51 



Fig. 8, 6 mm, 

 9, 8 " 

 It). 5-5 " Sabine River. 



11-17. Area rhoniboidella Lea 51 



Figs. 11-13, Claiborne sand forms. 



11, 17 mm. 



12, 22 " 



13, (inside view of fig. i, pi. 22. ) 



14, Orangeburg, S. C, specimen. 30 mm. 

 15-17, var. siibscopula, n. var., Lisbon specimens. 



15, 30 " 



16, 17, 28.5 mm. 



