Mr. J. G. JefFreys's Azotes on Swiss Mollusca. 33 



Ci/c/as r kalis, Drap. 



Lacs du Brenet et Bret ; near Carouge, Geneva. 



Var. Cyclas nucleus, Stud. 

 Chamblande, near Lausanne. 



Var. Cyclas lacustris, Charp. (but querij of Drapamaud ?). 

 Les Pierrettes, near Lausanne. 



Cyclas calyculata, Drap. 



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

 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, Norman d (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. 



Pisidiitm jmsillum, Jenyns ; and var. Pisidium tninimum, 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 roseuin, 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. Xautiliformis, H. radiatula, H. puru ; Pupa inor- 

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

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

 norbis corneus ; Paludina abbreviata, Pal. marginata ; Pisidium 

 cinereuiu, 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. &^ Mag. N. Hist. Ser. 2. Vol.w. 3 



