THE FAMILY NAIADES. 



57 



O 



Ph h-( 



^« 



I 



o 





WIDE. 



coelestis. Lea. 

 ensiformis.* Lea. 



An. ensiformis. Spix. 



longina. Fer. 



An. longinus, Spix. 



* It is with a good deal of doubt that I have placed this shell among the 

 Iridinx, as I know not whether the animal is furnished with tubes. 



