100 Birgithe Esmark. 



Balea Brid. 

 B. perversa L. The museum of Tromsø has a half- 

 grown specimen from Tranø in Hammerø. 



Glausilia Drp. 

 CI. hidentata Strøm. On the southern parts of Tromsøen. 

 var. septentrionalis. Tromsøen, and Tranø in Ham- 

 merø (Mrs. Gylche). 



Valvata Müll. 



V. piscinalis Müll. The colour is in halfgrown speci- 

 mens greenish, on fullgrown ones it goes over to yellowish 

 grey or yellowish brown. The largest shell has 6 m. m. in 

 diameter, the hight 4 m. m. One shell is scalari«form, the 

 foremost half of the last whorl is separated from the prece- 

 ding, and bent downward. Very common at „Bjerkeng" by 

 Fjeldfrøskelv, a tributary to Maalselven, in the soft muddy 

 bottom together with L. ovata. 



Fjeldfrøskelv runs very slow, every where in a bed of 

 quartz-schist and quartøite and therefore contains but very 

 little calcium. 



Limnœa Drap. 



L. stagnalis L. At „Gadde-luobbal" („Katalombola"), 

 Pasvik river in South- Varanger. 



L. ovata Drp. Very thin shells, colour light, greyish 

 yellow or brown. The spire in most of them very long ; the 

 whorls very convex. It is very common i Fjeldfrøskelv, 

 „empty shells ar found by thousands on the bottom together 

 with," V. piscinalis. One small form from, „Præstvand" on 

 Tromsøen. 



L. mucronata Held« 



I know no other species to which to refer this form. 

 It is well distinguished from L. ovata, by its high and slen- 

 der spire, and very convex whorls. The shell is thinner 

 than specimens from Ciessin as it lives in water containing 



