27 Bulletin 38 57 



Distribution. — Upper Miocene or Pliocene. Well near Al- 

 exandria, La., at 49 feet. Brackish water formation. 



Note. — The living species of this fresh water genus are not 

 included in this Sj'nopsis. 



Genus TRALIA Grar 



pusilla Gmelin, S5-st. Nat. p. 3436, 1792, (as ]'oluta)\ Dall, Pr. 

 U. S. N. M., 8, p. 276, pi. 18, f. 5, '85: Bull, 37, U. S. N. 

 M., p. 92, pi. 47, f. 5, ' 89; Dall & Simpson, Bull. U. S. 

 Fish Com. i, p. 369, pi. 54, f. 13, 1901. 



triplicata Donovan, 1802; ovula Bruguiere, 1789; nitcns 

 Lamarck, 1822. 



Distribution. — Cedar Keys to Guadeloupe. 



minuscula Dall, Bull. 37, U. S N. M., p. 92, 1889. 



Distribution. — Tampa to Bahamas. 



(Alexia) myosotis Draparnaud, Tabl., p. 53, '01, {a.s AuTicula)-, 

 Dall, Pr. U. S. N. M., 8, p. 277, '85; Bull. 37, U. S. N. M., 

 p. 92, pL 52, f. 9, '89. 



dentiailata Montagu, Test. Brit., p. 234, pi. 20, f. 5, '02, (as 

 Vohita) 



Distribution. — Europe; Jamaica (introduced); West Florida, 

 San Francisco (introduced). 



Genus BLAUNERIA Shuttleworth 



heteroclita Montagu, Test. Brit., Suppl., p. 469, 'oS, (as Valuta); 

 Arango, Moll. Cubana, p. 60. '78; Dall, Pr. U, S. N. M., 

 8, p. 287, pi. 17, L 6, '85; Buli. 37, U. S. N. M., p. 92, pi. 

 47, f. 14, '89, Dall & Simpson, Bull. U. S. Fish Com., i, p. 

 369, 1901. 



pellucida Pfeiffer, '40, cubevsis Pfr. 



Distribution. — Tampa and Marco, West Florida. Also 

 Antillean. 



