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, figs. 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 harrisiaua Aldr., n. sp. (PI. IV, figs. 10, 11) . . 74 



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



Lymnaea 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 pusilluin Sterki, n. sp. . . .3 



Naiades, The anatomical structure of certain exotic (Pis. 



VI, VII) . . . . . . . 103,114,127 



Nodularia 



Nodularia orientalis Lea . 

 Nodularia pazii Lea. 

 Nodularia subpressa Heude 

 Notes .... 



97 



98 



98 



. 94 



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



