102 



ßirgithe Esnark, 



mellar fold is less reflected than is general, whereby the um- 

 bilicus becomes more visible. From the limestone quarry by 

 Tromsø. By the quarrying of stone wanted for building pur- 

 poses, cavities have been formed. These have gradually been 

 filled with water, though having no communication with any 

 rivulet. It would therefore be difficult to account for, how 

 L, truncatula could be found there, if the enigma could not 

 so easily be solved by recurring to the grallatores and an- 

 seres among the birds as transporters. When the birds swim 

 and walk about the shores, among reeds and grass, and in 

 mud, eggcapsules and animals can easily stick to their legs 

 and thus by the birds be carried from one lake to an other. 



var. Schneideri m. 



Shell dark brown with a redish tinge, turreted, the 

 ridges are in fullgrown specimens indistinct in spiral direc- 

 tion; young shells transparent, fullgrown ones opaque, many 

 of them bleached and all more or less gnawed. Whorls 6, 

 convex, rapidly increasing in breadth, the last bowed down 

 towards the mouth, and more (a. b.) or less (c.) truncated; 

 suture deep; mouth eggshaped, rather acute — angled above; 

 columella a little obliqve ; the outer lip is fastened very much 

 to the left on the penultimate whorl, almost meeting the 

 inner lip, the latter is not folded on the columella, which 

 makes the umbilicus free. 



It was found Sept. 11th, very numerous on „Fløifjeld" 

 about 500 m. high in a shallow dike, only 33 cm. deep, but 

 also by hundreds quite dry under stones, and bored down 

 ip the moist sand where the water was dryed up. 



