86 JOURNAL OF CONCHOLOGY, VOL. 15, NO. 3, JULY, I916. 



only careful to introduce the flora association, but also the full 

 moUuscan association, Helicella barhara L., etc. 



Mr. J. W. Taylor in his notes on Hygromia timbrosa Partsch and 

 its occurrence on British soil cautions us all against the too ready 

 acceptance of the theory of introduction of a species by artificial 

 means. At Saundersfoot, near Tenby, where the variety menkeana 

 occurs almost to the exclusion of the type, the area occupied by H. 

 pisana is even smaller than at Porthcawl, but nevertheless the species 

 is there in extraordinary abundance. This is another instance of a 

 locality never properly recorded. Mr. A. G. Stubbs says only : — 

 "Odd specimens oi H. pisana have also turned up at Saundersfoot" 

 {Joiirn. of Conch., vol. 9, p. 327), and in Mr. Taylor's Monograph we 

 read " Occasionally found at Saundersfoot, but was found plentifully 

 there in 1883, on a piece of sandy ground not far from the sea, by 

 Mr. C. Jefferys." It was also found in profusion by Mr. Edward 

 Collier in 1900. There is no doubt that were it possible to work 

 right along the coast-line from Pembrokeshire to Glamorgan similar 

 detached colonies would be found connecting the three counties, 

 Pembroke, Carmarthen, and Glamorgan. 



Paludestrina jenkinsi in Carnarvonshire. — Paludestrina jenkinsi occurs, 

 although hardly in its usual abundance, in the marshes below Ynyscynhaiarn 

 Church, near Criccieth. Specimens which I collected — some fifty in number — in 

 September, 191 1, were all referable to the var. acukata, the form with strong spines 

 at rather wide intervals on the keel. Associated with the Paludestrina were 

 Limncva peres^er, Planorbis crista, and Pisidiu))i casertaniuii. — Chas. Oldham 

 [Read before the Society, Dec. 8th, 1915). 



Resemblance of the Cocoons of Talaeporia tubulosa to Clausilia 

 bidentata. — While collecting Clausilia on the trunks of beeches on Westwell 

 Beacon, last August, I occasionally at first sight mistook certain cocoons for 

 Clausilia bidentata. They were placed on the trunks in exactly the same posi- 

 tion as that in which Clausilia climbs. Some of these cocoons I submitted to Mr. 

 Alfred Sich, F.E.S., who informs me that they are those of Talccporia tubulosa 

 Retziiis, a lepidopterous insect belonging to the family Psychidce. Though this 

 cannot be a case of mimicry, the resemblance is interesting. — A. J. Arkell [Read 

 before the Society, November loth, 191 5). 



