122 ESMARK : MOLLUSCA OF NORWAY. 



P. pallidum Pfr. Rare. Asker by Christiaia, Tonset, Fjeld- 

 froskelv in Maalselven. 



P. obtusale Pfr. Very common in Christiania, and Christian- 

 sand Stifts, and in the Amt of Tromso. Often in great 

 quantity. Many locaHties round Christiania, Eker, Ringerige, 

 Romerige, Krodsherred, and Jarlsberg, in Christiania Stift ; 

 Brevik, Arendal, Skien, Lillesand, * Langvand,' in Bergen ; 

 several lakes in Tonset, where I also found a small form, 

 very ventricose, colour bluish-grey, and epidermis rough ; 

 Trondenaes, ' Skotstinderne,' near Groto ; Tromsden. 



P. obtusale var. personatum Malm. Romerige. 



P. obtusale var. esmarkiana Cles. Sandtjern at Eastern 



Modum. 



P. obtusale var. colletti Cles. Shell small, ventricose, toler- 

 ably solid, distinctly striate, beaks broad, ventricose and very 

 prominent ; anterior margin short and rounded, posterior 

 ?nargin narrow and rounded. Ringebu in Gudbransdalen. 



P. lilljeborgi * Cles. Very common in the north. It is new 

 for the fauna. In Tonset, in many lakes ; Gausdal, in 

 Gudbransdalen ; Gaaso and Groto, in the Amt of Nord- 

 land ; Trondenses, ' Proestvand,' in Tromsden, in great 

 quantities ; Oxfjord and Kvsenvik, in Alten, in the Amt of 

 Finmarken. 



P. lilljeborgi var. transversale Cles. Trondenses. 



P. lilljeborgi var. minor. ' Vetlevand,' near Gausdal Sana- 

 torium. 



P. pusillum Gmel. Rare. Asker, Eker, and Christiansand. 



P. pulchellum Jen. Not so rare as the preceding species. 

 Statelle, some small lakes at Tonset, Gausdal, and 

 Trondenses. 



P. hoyeri Cles. Tromsden and Reno, in the Amt of Tromso. 



P. nitidum Jen. Rather common. Tyrifjorden, Eker, 

 Ringerige, Laurvik, Skien, several lakes round Arendal, 



* The description of this and following new species and Varieties is in 

 the last part of ' Malacozoologishe Blatter,' N. Folge Band viii. 



J.C, v., Oct., 1886. 



