Bulletin 31 25l« 



PLATE 21 



Figure ^ 



1-7. Clycymeris trigonclla Con 49 



Fig. I, II mm., Claiborne sand, 



2, lo mm., Claiborne sand. 



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



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



5, a, var. 'cuautubbeaiia, 8 mm., Mi.ssissippi var. 



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

 6, the same, 10 mm. 



8-10. Clycymeris sabinensis, n. sp 5i 



Fig. 8, 6 mm. 

 9,8 " 

 10. 5-5 " Sabine River. 



11-17. Area rhomboidella Lea 5^ 



Figs. 11-13, Claiborne sand forms. 



11, 17 tnm. 



12, 22 " 



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



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

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



15, 30 " 



16, 17, 28.5 mm. 



