CORRIGENDA 



Bulletin 34, p. 71 (/oj), cut out Ayitigona {Ventruvla) cal- 

 limorpha Dall as extralimital. Not }'et found in the Gulf of 

 Mexico (Dall, 1921). Remove /z'/z^/a Dall from s5mon3mi3- with 

 the above and refer to genus Vesicomya. Also extralimital. 



Bulletin 36, p. 6, {332) 2d line, change Volvula cyclindrica 

 to Volvula cylindrica . 



ADDENDA 



Bulletin 34, p. 26 {^58). Under genus U7iio add the follow- 

 ing species : miisinus, alixus and sandrinus Dall, Proc. U. S. N. 

 Mus., 46, pp. 229-230, pi. 20, figs. 2, 4, 5, 6, 1914. Brackish 

 water Upper Miocene or Pliocene, well near Alexandria, Louis- 

 iana, ab6ut 48 feet below the surface. 



