Mr. J. G. Jeffrey s's Notes on Swiss Molltisca. 33 



(Ji/clas rivalis, Drap. 



Lacs du Brenet et Bret ; near Carouge, Geneva. 

 Var. Cyclas nucleus, Stud. 

 Chamblande, near Lausanne. 



Var. Cyclas lacustris, Charp. (but query of Draparnaud ?). 

 Les Pierrettes, near Lausanne. 



Cyclas calyculata, Drap. 



Mont d'Orge (Charp.). In a pond on the Berue road, and at Le8 

 Pierrettes, near Lausanne ; Visp. 



The colour of specimens taken in the same place during the 

 months of June and October differed considerably in intensity ; 

 being much darker in the latter month, when they perhaps put 

 on their winter dress. 



Var. Cyclas Ryckholtii, Normand (Cyclades de Valenciennes) . 



With the normal or typical form in the first locality indicated by 

 me, but not common. 



Pisidium obliquum, Drap. 



Lac de Neufchatel, pres d'Yverdun (Charp.). 



Pisidium fontinale, Pfeiff. 



Pisidium pusillum, Jenyns ; and var. Pisidium minimum, Stud. 

 In every pond and ditch. Common. 



Pisidium cinereum, Aid. 



In a small pond near Lausanne, on the Berne road ; ditch near Le 

 Pelerin ; Visp. Local, but gregarious. 



Pisidium nitidum, Jen. (1832). 

 Pisidium roseum, Scholtz (1843). 

 Lacs de Bret et Brenet ; Visp. Rare. 



I have thus added to the list of Swiss Mollusca the under- 

 mentioned species. Vitrina elongata ; Succinea Pfeifferi ; Helix 

 angigyra, H. Nautiliformis, H. radiatula, H. pura ; Pupa inor- 

 nata, P. Ferrari, P. pagodula, P. dilucida, P. Halleriana ; Clau- 

 silia Moussonii, C. ornata, C. Stabilei ; Limneus elongatus ; Pla- 

 norbis corneus ; Paludina abbreviata, Pal. marginata ; Pisidium 

 cinereum, Pisid. nitidum ; being altogether twenty. One species 

 {Pupa Halleriana) has been now described for the first time. 



The complete list shows the following result with regard to 

 the British Mollusca. 



Ann. Sf Mag. N. Hist. Ser. 2. Vol.xv. 3 



