128 succinic. 



Species of Simpulopsis. 



approximans, Shuttl. Portoricensis, Shuttl, 



atrovirens, Moric. rufescens, Moric. 



hyalina, Shuttl. sulculosa, Ferns. 

 obtusa, Sow. 



Genus SUCCINEA, Draparnaud. 



Animal nearly retractile within the shell. 



Shell imperforate, oval, horny ; spire short, last whorl 

 large ; aperture wide, oblong ; columella simple, acute ; 

 peristome simple, acute. 



Si/n. Lucena, Oken. Amphibulima, Lam., not Blainv. 

 Tapada, Stud. Amphibulimus, Mont/., Blainv. Amphi- 

 bina, Hartm. 



Ex. S. picta, Pfeiffer, pi. 73, fig. 2. Shell, S. putris, 

 Linnceus, fig. 2, a. 



The animals of this genus are sub-aquatic and amphi- 

 bious in their habits, living among plants near the water. 

 The species are very numerous, and are found in all parts 

 of the globe, abounding especially in temperate climates. 



Species of Succinea. 



acuta, Pfeif. campestris, Say. 



angustior, C. B. Adams. Candeana, Lea. 



arenarea, Bouch. cauella, Gould. 



aurea, Lea. Chilensis, Phil. 



avara, Say. cingulata, Forbes. 



Barbadensis, Guild. concisa, Monss. 



Bensoni, Pfeiff. concordialis, Gould. 



brevis, Dkr. crocata, Gould. 



caduca, Migh. exarata, Krauss. 



