226 lOIIRNAl. OF CONCHOI.OOY, VOl,. l6, NO. 7, SRPTRMliER, I92I. 



Pisidium casertanum (Poli).— Vestdalr and Seydisfjoid, Egils- 

 tadr and Snjoholt in Fljotsdal (H.A.S.). 



Pisidium milium Held. — Vestdalr, Vestdalseyri, ditches at 

 Fjardara and Seydisfjord, Snjoholt and Eidar in Kljdtsdal (H.A.S.). 



Pisidium henslowanum (Sheppard). — Ketilsstodum and Eidar 

 in Fljdtsdal (H.A.S.). New to Iceland. ' 



Pisidium hibernicum Westerlund. — Ketilsstijdum and Eidar 

 in Fljotsdal, Yestdalseyri near Seydisfjord (H.A.S.). New to Iceland. 



Leda buccata Stimp.son from British Waters.— While dredging in Orkney 

 in 191 7, I obtained two valves of a Leda I was unable to name. I submitted them 

 to Mr. Tomlin who identified them as L. buccata St., and kindly sent me examples 

 from Greenland for comparison. They are probably sub-fossil, as I obtained in the 

 same haul (20 fathoms, Hoy Sound) many examples of Astarte borealis Schum. 

 and Tellina cakarea Gm. Leda buccata is recorded from the Pleistocene gravels of 

 Ballybrack near Dublin. — R. Winckworth {Read before the Society, May 12th, 

 1920). 



Helicella virg-ata (Da Costa) Destroyed by Moles. — Near St. Ouen's Bay, 

 Jersey, is a range of sandhills through which runs a beaten track. On the track 

 side is a quantity of low herbage upon which innumerable Helicella virgata (Da 

 Costa) feed. This sandy waste is also inhabited by moles, and their hills can be 

 seen in numbers, but what strikes the observer is that almost every one of these 

 molehills is covered with the dead shells of H. virgata, which have fallen upon the 

 sand thrown up and have been unable to escape, dying practically where they fell. 

 The numbers of dead shells upon the undisturbed sand beneath the herbage is 

 negligeable compared with the number upon the molehills for the same area. At 

 the time I visited the spot in 19 10 there had only been rain upon two days in 

 seven weeks, and the sand was therefore very dry and hot. Whether the moles 

 when throwing up the sand shake oft" the H. virgata from the herbage around I 

 cannot say, but appearances would suggest that they do, or on the other hand the 

 molluscs may drop to the ground in the ordinary course of their life, and whereas 

 they can regain the herbage when the sand beneatli has not been freshly disturbed, 

 they cannot do s(j when the sand is loose as on -the molehills. In any event the 

 moles unknowingly are responsible for the destruction of hundreds of H. virgata 

 in this locality. — A. K. Lawson {Read before the Society, February nth, 1920). 



Note on the Mactra complanata of Reeve and Deshayes. — This fine species 

 was described by Deshayes in the Proceedings of the Zoological Society, 1853, 

 p. 14, and by Reeve in Conchologia Iconica, vol. viii, pi. xii, fig. 54. It is 

 always credited to Deshayes, but his paper was not jjublished till June 27th, 1854, 

 whereas Reeve's plate xii appeared in April, 1854. In any case, however, the 

 name is preoccupied by Mactra complanata Gmelin (now Lutraria complanata), 

 and as I cannot find any other name applicable, I propose to rechristen Reeve's 

 species chionia. It belongs to the genus Mactrinnla. — J. R. le B. Tomlin {Read 

 before the Society, April 6th, 1921). 



