212 PEARCE : MOLLUSCA OF EAST SWITZERLAND. 



{b). A form with an elongate spire, especially abun- 

 dant in the stream that connects the Silzer and Silvaplana 

 Sees. Mr. Taylor thinks this probably the variety elo?iga- 

 tissima Gredler. 



(c). Several specimens having small and very obese 

 shells, taken in the Silvaplana and Campfer Sees. 



id). A distortion apparently not uncommon in the 

 Silzer, Silvaplana, and Campfer Sees. The ordinary shape 

 of the last whorl is destroyed by the anterior portion being 

 bent outwards from within, so that the shell has the appear- 

 ance of a large Physa fontinalis. 



L.auriculariaL. — InthelargelakesoftheEngadine. Evidently 

 prefers deeper water than the other species, feeds wholly 

 off the confervoid growth to be found on the rocks and 

 stones. No ordinary aquatic plants flourish in the cold 

 waters of the lakes themselves, but only in the side streams 

 and ditches. The shell attains a large size and is generally 

 eroded. 



L. auricularia var. angulata. — Mr. Taylor informs me that 

 one specimen from the Silzer See belongs to this variety. 



L. truncatula Miill. — Plentiful in the Upper Engadine. 

 Associated with L. peregra. 



L. truncatula var. minor Jeff. — Not at all plentiful. 



L. truncatula var. oblonga. — The more abundant form. 



[Arion sp. ?]. — A not uncommon brown chocolate slug, 



sometimes greyish, with two black stripes on back and 

 shield, having the flanks and foot of a paler tinge ; in size 

 intermediate between Arion ater and A. hortensis. 



One individual occurred above 6,000 feet near Maloja, 

 but far more frequent on and below the Pass. 



[Arion hortensis Fer.]. — In the Upper Engadine; a few 

 individuals of a small size taken at Sils Maria and Maloja 

 at the roots of a Rumex and other plants in damp spots. 



J.C, v., July, 1887. 



