II. THE CONTENTS OF THE COLLECTION 



Long lists of names are wearisome, yet being con- 

 crete and tangible, they offer the only convincing proof 

 of the value of a scientific collection. To avoid the 

 prolixity of a complete catalogue while exhibiting the 

 scope of this collection, an alphabetical list of the genera 

 represented is taken from Mrs. Williams' manuscript 

 catalogue. This list is inadequate because many forms 

 contained in the collection are catalogued under the 

 broader generic terms of a few years ago, and also be- 

 cause a host of new shells, — whole collections in them- 

 selves, — have been added since the catalogue was 

 written. Even without these additions, the list is a 

 commanding one, and includes over seven hundred and 

 fifty names. 



THE GENERA REPRESENTED 



