144 PROCEEDINGS OF THE MALACOLOGICAl SOCIETY. 



was nothing green anywhere near, but a theory suggested itself, to 

 which I recur later on. 



At Sarajevo, my next objective, it was a joy to find that fine 

 species CI. Dacica, Friv., under grass in the cracks of rocks on the 

 banks of the Miljaska, not five minutes from the Rathhaus. One 

 does not usually find a giant Clausilia so near to the walls of the 

 town hall of a capital city. 



From Sarajevo the next move was to Jajce, and on the road I had 

 yet another lesson that it takes more ways than one to find Clausilia. 

 At a junction called Lasva we had 15 minutes to wait, and I strolled 

 down a shabby path past an engine-house, at the foot of the railway 

 embankment. Here was a scree of small black stones ; I turned one 

 or two over, not expecting any result, and found the under side 

 swarming with CI. vetusta, Zieg. This species seemed to live by 

 preference among the roots of dead or decaying grass. 



Jajce, besides its extreme natural beauties, is a fine locality for the 

 collector. The castle walls yielded CI. decipiens, Rossm., and vetusta, 

 Zieg., the former abundant, the latter scarce, but both living between 

 the stones of which the castle wall is composed. The same locality, 

 it may be mentioned, gave me Zonites acies, L., and comprsssus, Zieg., 

 with ffelix planispira, Lam. Now came a more serious piece of 

 work. In Dr. Norman's collection of European Land MoUusca, 

 acquired by the British Museum, there is a noble species of Clausilia, 

 labelled by Dr. Brancsik " CI. Bosnensis, Zieg., var. Plivce, Brancs., 

 Jajce, Felsen am rechten Plivaufers." I naturally determined to have 

 it, and spent most of an afternoon hunting the rocks on the southern 

 bank of the Pliva, just before it falls into the Urbas in that beautiful 

 cascade. Not a sign of it could be seen. At last a cliff was visited, 

 at the foot of which a few dead specimens were noticed. Then one 

 and then more living specimens were found, until a fair number had 

 passed into the collecting-box. But it was another instance of looking 

 in the right place. All localities, however promising, were vain, 

 until I discovered that it was again the fact that the creature 

 preferred absolutely bare rock to those clothed with greenery. Here 

 were a few scanty mosses, and on these, in the late afternoon, the 

 creature emerged to feed, leaving the ledges and deep cracks in the 

 limestone in which it had hidden during the day. 



Yet once more was the lesson impressed upon me that the ways of 

 Clausilia are not learned in a week. From Jajce I drove 45 miles to 

 Banjaluka. On the way I closely observed the rocks of the grand 

 defile, and detected nothing at all. The post waggon stops at a little 

 place called Bocae for midday meal, and while it was preparing 

 I strolled along the road examining the cliffs, which were full of 

 admirable and attractive cracks, well supplied with green food, and 

 absolutely destitute of Clausilia, The road at a certain point makes 

 a tiny cutting through the rock, and leaves, on the side opposite to 

 the cliff, a little isolated crag of bare limestone. I strolled past this 

 crag without examining it, as it appeared quite hopeless. On my 

 return, entirely empty-handed, it struck me — " that rock will be in 

 shade, the cliff is all in sun." In 15 minutes, with the help of two 



