SYSTEMATIC INDEX. 



PAGE \ 



PAOE 



Sphaerium argentinum, Orb. 

 52 



Sphaeriumbahiense, Spix. 53 

 Sphaerium barbadense, 



Prime. 53 

 Sphaerium modioliforme, 



Ant. 54 

 Sphaerium meridionale, 



Prime. 55 



Sphaerium maculatum, Mrl. 

 55 



Sphaerium veatleyii, Ad. 56 

 Sphaerium portoricense, 



Prime. 56 



Sphaerium parvulum, Prime. 

 57 



Sphaerium viridante, Mrl. 57 

 Sphaerium cubense, Prime. 



58 

 Sphaerium recticardinale, 



M. fr H. 58 



Sphaerium planum, J/. $ H. 

 58 

 Sphaerium formosum, 



M.frH. 59 



Sphaerium subellipticum, 

 M. frH. 59 



Pisiclilliii, PFEIFFER. 59 

 Pisidium virginicum,Z?0Mr#. 



61 



Pisidium adamsi, Prime. 63 

 Pisidium aequilaterale, 



Prime. 63 

 Fisidium compressum, 



Prime. 64 



Pisidium variabile, Prime. 66 

 Pisidium nov-eboracense, 



Prime. 67 



Pisidium abditum, Hald. 68 

 Pisidium simile, Prime. 69 

 Pisidium chilense, Desk. 69 

 Fisidium jamaicense, Prime. 



70 

 Pisidium pulchellum, Desh. 



70 



