THE NAUTILUS. V 



Nason collection 62 



Nenia belahubbardi Pils., n. sp. (pi. 2) 93 



Nenia bryantwalkeri Pils., 11. sp. (pi. 2) 95 



Nenia flachi tingamarise Pils., n. subsp. (pi. 2) 94 



New forms of Pleistocene mollusks from Illinois 22 



Noraenclatorial notes 49 



Notes 27, 62, 99, 132 



Nudibranchiate mollusca from the Pacific coast of North 



America 74 



Observation on living Gastropods of New England 85 



Oreohelix macnlata Henderson, n. sp 15 



Oreohelix walcottiana Bartsch 48 



Oxystyla floridensis Pils 20 



Oysters injured by oil 28 



Peruvian Clausiliidas 93 



Polygyra columbiana shasta Berry, n. subsp. (pi. 2) .... 37 



Polygyra, sierrana Berry, n. sp. (pi. 2) 36 



Publications Received 60, 97, 135 



Eadiodiscus marias Pils., n. sp 49 



Eiver barriers to aquatic animals 1 



Slugs, the nomenclature of 77, 117 



Sonorellas and scenery 123 



Sphasriidee, Hinge of 104 



Strobilops labyrinthica, the anatomy of 91 



Syncera Gray 99 



Tethys willcoxi in New England waters 80 



Typhlochiton felipponei Ball, n. sp 4 



Valvata tricarinata Say 23 



Valvata tricarinata supracarinata Baker, n. var 24 



Williams collection 62 



INDEX TO AUTHORS. 



Baker, Frank C 22, 130 



Bartsch, Paul 85, 99 



Berry, S. S 35 



Clark, H. W 16 



Cockerell, T. D. A 12, 39, 101 



Ball, W. H 4, 49, 84, 96 



Fuller, A. B 29 



Goodrich, Calvin 1, 9, 58 



Hand, Edwin E 123 



Eanna, G. Dallas 34, 60, 91, 97 



Henderson, Junius 14 



Johnson, C. W 28, 62, 98 



