AQUATIC. 



Class CONCHIFERA. 

 Order LAMELLIBRANGHIATA 



Family 1. SPH.<fERIID.^. 



Genus i. SPHi^iRIUM. 

 Sphfierium corneum 

 Sphnerium corneum, var. I flavescens 

 Sph;i?i"ium corneum, var. 2 nucleus 

 Sphairium corneum, var. 3 Scaldiana 

 Sphserium corneum, var. 4 Pisidioid.es 

 Sphserium rivicola 

 Spliaerium ovale 

 SpniBrium lacustre 



Sphienum lacustre, var. I Brochoniana 

 Sphairimn lacustre, var. 2 rotunda 

 Spha-rium lacustre, var. 3 Ryckholtii 



Genus 2. PISIDIUM. 

 Pisidium amnicum 

 Pisidium fontinale 



Pisidium fontinale, var. I Henslowana 

 Pisidium fontinale, var. 2 pulchella 

 Pisidium fontinale, var. 3 pallida 

 Pisidium fontinale, var. 4 cinerea 

 Pisidium pusillum 

 Pisidium pusillum, var. obtujalis 



