@article {420, title = {The Nerita ascensionis species complex in the South Atlantic}, journal = {The Veliger}, volume = {13}, year = {1970}, pages = {135-138}, author = {Vermeij, G.J.} } @article {421, title = {Notes on recent and fossil Neritidae, 1: Notes on Nerita olivaria and Nerita junghuhni}, journal = {Basteria}, volume = {34}, year = {1970}, pages = {61-66}, author = {Mienis, H.K.} }