*— urticosa, xxiii, 293.
Oxinoe ? glabra, xxxiv, 217.
Oyster shell deposits of the Atlantic coast, of Indian origin, xli, 168.
Paludina heterostropha, xxxv, 269.f
*Pasithea cancellata, xl, 93.f
*— elegans, xl, 93.f
*— minima, xl, 92.f
— nigra, xxvi, 369.f
— sordida, xlii, 110.f
— — of Lea, the Actæon trifidus of Totten, xlii, 392.