Notes on the Collection 73 



of C. spadicea, C. tigris, C. mappa, etc. Here is an 

 opportunity for the student of individual variation and 

 environmental modification! There are eleven C. 

 aurantia, ten C. decipiens, seven C. scotti, fourteen C. 

 testudinaria, four C. leucostoma, six C. walkeri, four 

 C. umbilicata, ten C. thersites, and so on through the 

 really rare species, no one of them a duplicate. 



A mere list fails utterly to show the wealth of repre- 

 sentation without repetition, whereby this collection 

 offers some three thousand specimens to illustrate the 

 ramifications of not over three hundred and fifty recog- 

 nized species and varieties. No list, no description, can 

 convey the mental impression made by this assemblage 

 of three thousand spotlessly perfect specimens. 



The Pediculariidae, Ovulidae, Doliidae, and 

 Cassididae are fully represented ; also the Naticidae, 

 with eighty or ninety species, illustrating all of its 

 curious genera. The same may be said of the multi- 

 form Calyptraeidae. Fossil forms of all these fami- 

 lies are in the collection. 



Still more strange and bizarre are the members of 

 the next two families. The Xenophoridae constitute 

 a small group of great interest and rarity, and there are 

 many fine specimens, those of Xenophora pallidula 

 being especially remarkable in the array of objects 

 with which it has decorated its whorls, — itself a conchol- 

 ogist of no mean repute. The aberrant Vermetidae 

 are similarly distinguished by a Siliquaria ( Tenagodus) 



