58 CHRISTY : ON MOLLUSCA COLLECTED IN SWITZERLAND. 



mountains was melted, and the sun's heat was not sufficient to 

 melt what little there was left, here I found a plentiful supply of 

 small Lyinncza tnmcatula and Succinea elegans, while Planorbis 

 rotundatus was common in a dried-up ditch close at hand. On 

 the nth of August I obtained, by careful searching in cracks 

 and among the roots of the tufts of grass, a good number of 

 Balea perversa and Pupa marginata on a small face of rock 

 above the gorge through which the Inn flows after having left 

 the lake at the falls. Helix obvohita lived sparingly among the 

 debris of loose pieces of rock near the same spot, and in several 

 other spots about St. Moritz. Empty shells of this species 

 seemed always to be commoner than live ones. On the 23rd, 

 during an expedition to the Roseg Glacier, I ascended the side 

 of the mountain near the glacier to a height of perhaps 7000 ft. 

 On my way I found beneath stones in the open a few specimens 

 of Cochlicopa li/brica, a Zonites (resembling fuivus) and a fair 

 number of what I believe to be Zonites excavatus. I also found 

 a few specimens of this near St. Moritz, as well as some small 

 whitish shells which Miss Hele beheves to resemble Z. radiatu- 

 lus var. viridescenti- alba. A small ditch in the meadows below 

 Celerina (into which I believe some of the drains of the village 

 run) supplied me with a curious variety of L. peregra. The 

 shells were of a good size and not altogether unlike L. palustris. 

 In the same locality I met with a few L. trwncatula and S. 

 elegans. The foregoing list of 20 species or thereabouts, 

 includes all the moUusca Avhich I met with during the two 

 months I spent in the Engadine. Doubtless with more atten- 

 tion bestowed upon conchology I might have found more sorts, 

 but I was busy collecting in other branches of natural history. 

 The great elevation of the district, however, would preclude a 

 very extended list, but I was surprised that, in spite of a careful 

 and repeated search, I met with none of the species of Clausilice 

 which are so common in the lower parts of Switzerland. The 

 number of Helices., too, might I should think be easily increased, 

 as it only includes, at present H. obvoluta and the hardy H. 



J.C, iv., April, 1883 



