220 BUL,I,ETIN 31 aaO 



PLATE 19 

 Figure Page 



1. THnacria decisa Conrsid. 18.5 mm 41 



2. The same, 20 mm. Both from base of Claiborne Bluff, Ala. 



3-6, Trinacria declivis Conrad 42 



Fig. 3, 18 mm. 



4, 21 mm., base of Claiborne Bluff. 



5, 8.5 mm., Lisbon. 



6, 18 mm., Lisbon, Ala. 



7, a. Trinacria pedimcularis 'Li&di, 4 mm 42 



8, a. The same, 4.5 mm. Claiborne sand. 



9, a. Trinacria ovalis Harris, 12 mm 43 



Base of Claiborne Bluff, Ala. 



10, a. Trinacria perplana Qonradi, 16 mm 43 



II. The same, 13.5 mm. Claiborne sand. 



12-15. THnacria ellipsis Lea 44 



Fig. 12, 10 mm.. Claiborne sand. 



13, 7 mm. 



14, 9 mm. 



^5. 10-5 mm., Claiborne sand. 



16, 17. T. ellipsis, var lisbonensis, n. var 45 



Fig. 16, 8 mm. 



17, 7 mm., Lisbon, Ala. 



