508 Mr. Jeffreys's Supplement to the ^^Synopsis of 



many parts of Switzerland and on the French side of the Jura ; 

 but has not I believe been found in more southern districts. 



H. cingenda, p. 333. 



Whitsand Bay, Cornwall. " Balbriggan Strand": App. to 

 Welsh ^ Whitelaw's Hist, of Dublin. 



H. virgata, p. 334. 



The variety a is very plentiful on Braunton Burrows, North 

 Devon ; and Mr. Alder has sent me a charming thin milk-white 

 variety with a band of the same colour. 



The H. neglecta of Draparnaud may, I think, be referred to 

 another variety. 



PfeifFer's var. a and both his figures for this species {variabilis, 

 P.) belong to the H. cingenda. 



H. caperata, p. 335. 



H. Thymorum. Pfeifer, i. 37. Taf. ii. fig. 21, 22. 

 Var. a. Candida, zon4 submarginali fusca, duabusque ap- 

 proximatis inferioribus. 



H. candidula. Fir.? 

 Of this very beautiful variety I found a few specimens on the 

 downs which overhang Whitsand Bay near Plymouth. Pfeiffer 

 at first called it a variety of his H. Thymorum ; but he seems 

 afterwards to have considered it as a distinct species in the Sy- 

 stematic Table at the end of his work. The point of difference 

 between it and the caperata seems to be the same as that which 

 is made to distinguish the Pecten opercularis and lineatus of 

 British conchologists. 



H. pallida, p. 335. 



Common in many parts of Surry and Kent. Neighbourhood 

 of Dublin: App. to Welsh ^ Whitelaw's Hist, of Dublin. 



Young shells are hispid, a character common to this and 

 many of its continental congeners. 



15bis. 



