374 JOURNAL OF CONCHOLOGY, VOL. 9, NO. 12, OCTOBER, I9CO. 



partly imbedded when I found them. The eggs are about 3 mm. by 

 ij mm., white, with a distinct calcareous shell and well-marked yolk 

 and the average number contained in a single individual was about 

 forty. Rnmina decollata can, of course, be taken at other times 

 besides during this short period, but it is only in very small numbers 

 or in ones and twos at a time. The most I have myself collected, 

 outside this particular space of time, has been seven, after four days 

 of continuous rain in November, 1898. Young specimens with their 

 apical whorls intact are not infrequently met with, but chiefly as dead 

 shells. Rumina decollata secretes a fairly thick white calcareous 

 epiphragm, remains of which always seem to remain attached to the 

 interior of the last whorl of the shell in living specimens. No species 

 of land mollusca suffers more severely than this from the ravages of 

 parasitic coleoptera, and fully twenty per cent, of all the specimens 

 are found with the lower whorls of the shell filled by a large white 

 larva. Unhappily I never bred this species of parasite, but I am 

 quite certain it is a different one from that infesting the Helicidae. 



Cyclostoma sulcatum (Draparnaud). — A few from the Roman 

 Amphitheatre at Cagliari. I regret that whilst collecting the terrestial 

 mollusca of the above places, I did not devote some portion of my 

 time to the freshwater species, which at Arosa Bay, at any rate, were 

 fairly plentiful. The only fluviatile molluscs, however, I brought 

 back with me were a species of Planorbis and a species of Velletia, 

 neither of which I have been able to name : these I took in a small 

 stream near Algerciras. 



Clausilia bidentata Strom, with two perfect mouths. — A specimen of 

 Clausilia bidentata with two mouths was found by me at the root of one of a 

 clump of ash trees on the south side of Cave Hill, Belfast. In order to account 

 for the injury to the shell, which has been so strangely repaired, I have watched 

 the cole and blue tits as they searched the trees in quest of their insect prey, and 

 although I have not actually seen them mutilate shells I strongly suspect that this 

 specimen received their attention. I have procured a number of living shells of 

 this species, but the cold weather has prevented them from being active. Later 

 on I intend to submit them when crawling to my caged siskin, in order to observe 

 how they will be received. When active CI. bidentata very much resembles a skip- 

 jack beetle, which the tits are not likely to pass by unnoticed. This specimen 

 might have served as original to Mr. J. W. Taylor's illustration (Monograph 

 Brit. L.F.W. Moll, p. 119.)— Hugh L. Orr {Read before the Society, Jan. 10th, 

 1900). 



Note on Eastbourne Mollusca. — Helix caperata var. obliterata has also been 

 found on the "Victoria Drive," near Eastbourne. Segmentina nitida and Planorbis 

 fontanus have been found living together in the Pevensey Marshes, and there is a 

 fine colony of Helix cartnsia?ia near East Dean on the Downs. — Arthur G. 

 Stubbs, Eastbourne, 1900 (Read before the Society, Sept. 12th, 1900). 



