HELICID^. 



73 



and Succinea also unite their hyaline eggs into a 

 mass with some gelatinous matter. The eggs of 

 Bulimus ohscurus are large, roundish-oval ; those of 

 Clausilia nigricans are ovoid, and very large for the 

 size of the animal, being nearly as large as the 

 mouth of the shells. Those of Balea are large and 

 globular. 



The followincj table is formed from M. Bouchard's 

 observations. The first column exhibits the time of 

 laying, No. 1. standing for January ; the second, the 

 number of eggs laid at one time ; the third, the 

 number of days hatching ; the fourth, the number 

 of months before the animal arrives at its adult 

 ao-e. 



