IV THE NAUTILUS. 



Cuba, mollusks of Guantanamo 120 



Cyprsea ostergaardi Dall, 11. 11. for C. pacifica Osterg., 



not Gray 50 



Diala rnarmorea Cpr 85 



Diala varia A. Ads 84 



Deroceras Eaf 79 



Disculella Pilsbry, the Helicoid group 12 



Dreissensia polymorpha in the British Isles 63 



Elliptic calamitarum Morelet 26 



Elliptic ortmanni Frierson 25 



Elliptic ravistellus Morelet 27 



Elliptic yzabalensis C. & F 26 



Epiphragmophora arrosa 35 



Epiphragmophora fidelis near San Francisco Bay 34 



Eulimax Moquin Tandon 78 



Flabellina opalescens Cooper 75 



Florida west coast Liguus 20 



Geomitra (Disculella) cenourensis Ckll., n. sp 12 



Glochidia in surface towings 16 



Gray Garden Slug with notes on allied forms 97 



Hawaiian Islands, shore reef hunting in the 82 



Helix calcarea Pfr 39, 100 



Helix ustulata Lowe 40, 100 



Hermissenda opalescens Bergh 75 



Hinkley collection 62 



Krynickillus Kalen 79 



Lake Winnebago, Wisconsin, mollusca of 130 



Lacuna vincta pertusa Conr 89 



Lampsilis gracilis lacustris Baker, n. subsp 131 



Land mollusca of the Madeira Islands 39 



Land shells from Palm Canyon, Cal. and Grand Canyon. 48 



Leptaxis, The Helicoid genus 101 



Leptaxis chrysomela bifasciata Ckll., n. subsp 103 



Leptaxis furva grandissima Ckll.., n. subsp 103 



Liguus, a search for 65 



Liguus, Florida west coast 20 



Limacella Brard 78, 117 



Limax L 78, 117 



Limax gracilis R-af 79 



Luray cavern, shells in 64 



Malino Gray 79 



Margarites johnsoni Dall, n. sp 50 



Megapelta Morch 79 



Meliba fimbriata A. & H 51 



Mollusca of Pisgah Forest, North Carolina 40 



