CONTENTS 



Page 



Introduction i 



Family Pyramidellidae 6 



Key to tiie superspecific groups of the family 6 



Key to the Pyramidellidae with triplicate columella 8 



Genus Triptychus Morch 8 



Genus Longchaeus Morch 9 



Key to the subgenera of Longchaeus 9 



Subgenus Pharcidella Dall 9 



Subgenus Longchaeus Morch lO 



Key to the pyramidellidae with biplicate columella 1 1 



Locklinia, new genus 1 1 



Key to the species of Locklinia 1 1 



Genus Eulimella Forbes 13 



Key to the subgenera of Eulimella 13 



Subgenus Eulimella Forbes 13 



Subgenus Cossmannica Dall and Bartsch 14 



Genus Orinella Dall and Bartsch 14 



Key to the subgenera of Orinella 14 



Subgenus Sulcorinella Dall and Bartsch 14 



Subgenus Orinella Dall and Bartsch 15 



Genus Peristichia Dall 16 



Genus Ugartea Bartsch 17 



Genus Turbonilla Risso 17 



Key to the subgenera of Turbonilla 18 



Subgenus Chemnitsia d'Orbigny 18 



Key to the species of the subgenus Chemnitsia 18 



Genus Mormula A. Adams 27 



Key to the species of Mormula 27 



Genus Bartschella Iredale 36 



Genus Pyrgiscus Phillippi 37 



Key to the species of Pyrgiscus 37 



Hybridization among mollusks 53 



Striopyrgus, new pseudogenus 57 



Genus Salassia Folin 58 



Subgenus Salassiella Dall and Bartsch 58 



Genus lolaea A. Adams 59 



Genus Chrysallida Carpenter 60 



Key to the species of Chrysallida 60 



Genus Miralda A. Adams 79 



Miraldclla, new subgenus 79 



Fargoa, new genus 80 



Key to the species of Fargoa 80 



Genus Eulimastoma Bartsch 82 



Key to the species of Eulitnastoma 82 



Genus Odostomia Fleming 83 



Key to the subgenera of Odostomia 83 



Subgenus Evalca A. Adams 84 



Key to the species of the subgenus Evalca 84 



Subgenus Odostomia Fleming 86 



Key to the species of the subgenus Odostomia 86 



Index 97 



iii 



