332 Oi/a?'te?-/y /oi/rnal of Co7ic1ioIogy. 



Ccms] icuou^ I y their entire absence are Helix rupestiis^ H. 

 5^;vVc(7 nr.d H. m'esseus. Not a single specimen of the common 

 shore periwinkle ( Littorina littorea) occurred to us, though we are 

 a>sured that it has been founn at Guernsey. The comparative 

 scarcity, too, of Biiccinum iinJatii/n reminds one of the more 

 southern latitude of thtse islands. 



A few Vv'ords may here be added with respect to He'ixpisana. 

 It was not till a fortnight after we discovered this shell atVazon Bay 

 that we learned, by tlie receipt of the Q.J. C. for August last, that 

 we had been anticipated by Mr. G. S. Tye, and we may take this 

 opportunity of confirming his account in most of the material 

 points. One point of difference, however, is this, that whereas 

 Mr. Tye had some difficulity in finding full grown specimens, we 

 could scarcely find any that were not full grovn. Perhaps, 

 however, our searching at different sea-ons of the year may 

 account for this divergence. Individual specimens, again, struck 

 us as being extremely large, while to Mr. Tye they seemed smaller 

 than usual. 



It of course occurred to us at once that so conspicuous a 

 shell as Helix pisana could not possibly be indigenous on an island 

 which had been the home of so distingui.-ihed a conchologist as 

 Dr. Lukis. Moreover --and here our conclusions differed entirely 

 from those of Mr. Rimmer given in the Q.J. C. last November — it 

 seemed probable that the inti oduction was not of very recent date, 

 first, from the extent of ground (at least ha!f-a-mile) over which the 

 shell was found; secondly, from our finding fiagments of old and 

 worn shells under large and heivy stones, which evidently had 

 not been moved for some time. We are aware that the locality of 

 Mr. Ri:nmer's find wa^ thj Vale Castle, while ours was Vazon ■ 

 Bay, but still, as will afterwards appear, ihe same reasoning applies 

 to each. Accordingly we wrote to Dr. Luki^' daughter, Mrs. 

 Corings, of Sark, her.-elfa great r.uthoriiyon all matters of natural 

 history, to ask if she could give u.-^ any i.iformation as to ihe intro- 

 duction of this snail. She replied as follows : — '■ Heiix pisana 

 "was iutrooucea in i860, from Jer^^ey. My brother was stayiiig 



