LYONSIA. 217 



It is by no means plentiful at Tenby (its original loca- 

 lity), and although " inhabiting each side of the Irish coast, 

 is very scarce" (Thompson). Among other j^laees in Ire- 

 land where it may be found, may be specified Birterbuy 

 Bay in Connemara (Barlee) ; and the bays of Dublin 

 (Jeff.) ; and Bantry (Brown). 



In Scotland it is dredged from Oban, Inverary, Lochs 

 Shieldag and Torridon (Jeffreys) ; the Orkneys, He- 

 brides, and Shetland Islands (M'Andrew), where it 

 has occurred in five, thirty, seventy, and eighty fathoms 

 water, and as far as twenty-five miles from land ; also in 

 thirty-four fathoms on the Elginshire coast, Aberdeenshire 

 (Macgillivray). 



SPURIOUS. 



To this genus belongs the Mytilus plicatm of Laskey and 

 Montagu, a species which we, in common with other 

 students of British Conchology, had regarded as lost to 

 science, until, searching in our national museum for the 

 remnants of Colonel Montagu's collection, we lighted upon 

 a specimen so exactly agreeing with the only extant figure 

 in the Wernerian Memoirs, and named on the tablet " Ly- 

 onsia plicata," that the supposition is not unreasonable that 

 it was the identical individual described and figured by our 

 authors. From this and a few other examples, we have 

 described the species, giving a more detailed account of it 

 than is our wont with the spuriously British shells, from 

 our conviction that it is by no means generally known to 

 the authors of works upon general Conchology. It is a 

 native of the West Indies (Guilding). 



VOL. I. P F 



