viii CONTENTS. 



Phylum V. Mollusca 361 



Class Pelecypoda 361 



Literature, 363. Artificial Key to the Genera, 364. Order 1 — 

 Prionodesmacea, 375. Order 2 — Anomalodesmacea, 522. Order 

 3 — Teleodesmacea, 533. 



Class Scaphopoda 578 



Family Dentaliidae, 578. Family Siphonodentaliidae, 581. 



Class Gastropoda 582 



Literature, 584. Artificial Key to the Genera, 586. Proso- 

 branchia, 603. Opisthobranchia, 806. Pulmonata, 811. Hetero- 

 poda, 823. 



Index of Genera 824 



Index of Species 830 



