IV THE NAUTILUS. 



Davisia, Notes on . . . . . . .47 



Ensidens Frierson, n. gen. (type Unio pazii Lea) . . 98 



Eocene Fossils from the Southern States . . 73 

 Epiphragmophora (Trichodiscina) verdensis Dall, n. sp. . 35 



Eucalodium (Anisospira) orcutti Dall, n. sp. . 34 



Eulimella. . . .52 



Eulima cossmanni Aldr. , n. sp. . 75 



Fissuridea mauryi Aldr. (PI. IV, tigs. 1, 2) . 73 



Gulf of California, New shells from the . . 32 



Haliotis cracherodii without perforations . .96 



Helix acutangula Burrow. . . 138 



Helix angulata Burrow . . 138 



Helix angulata Rackett ... .137 



Helix nemoralis, the Virginia colony of .84 



Hindsia perideris Dall, n. sp. . . 32 



Isapis obtusa Cpr. , A note on . 112 



Lamarck collection . . .60 



Lanzaia elephantota Megerle .... .14 



Lima harrisiana Aldr., n. sp. (PL IV, figs. 10, 11) . . 74 



Lottia gigantea var. albomaculata Dall, n. v. . 96 



Lymnsea emarginata wisconsinensis Baker, n. v. 58 



Malvinasia, Notes on Davisia and . .47 

 Method of progression of some land operculates from 



Jamaica ... .85 



Mexican land shells, Two new. . 34 



Mexico, Collecting shells in . 133 



Midway-Pernambuco fauna . . 144 



Modiolus diegensis Dall, n. sp. . 110 



Mollusks of Unity, Maine. . 61 



Mollusks of Unionville, Conn. ... .68 



Musculium pusillum Sterki, n. sp. . 3 



Naiades, The anatomical structure of certain exotic (Pis. 



VI, VII) 103, 114, 127 



Nodularia ... .97 



Nodularia orientalis Lea . . .98 



Nodularia pazii Lea. . .98 



Nodularia subpressa Heude . 94 



Notes . 11, 24, 48, 60, 72, 84, 120, 132 



