DIPLODONTA. 255 



Habitat : Not uncommon on the southern coasts of 

 England and in the Channel Isles, and also in the 

 south and west of Ireland, in 12-20 fathoms, sandy 

 mud. Being elsewhere local, I may mention that it has 

 been taken by Forbes and M 'Andrew in 7-25 fathoms 

 off Lundy Island, by Lyons at Tenby, by myself in 20 

 fathoms at Fishguard, and by M' Andrew in 12 fathoms 

 off Anglesea. Sir W. C. Trevelyan and the Rev. G. C. 

 Abbes are reported to have found it at Seaton and 

 Whitburn; but Alder suspects these specimens were 

 <c derived from ballast." Possibly Lucinopsis unclata 

 may have been mistaken for it. The present species is 

 a Coralline Crag fossil. Its foreign distribution is alto- 

 gether southern, viz. Vannes (Mittre) ; Nice (Risso) ; 

 Sicily (Philippi) ; iEgean (Forbes) ; Madeira and the 

 Canary Isles (M f Andrew). 



I have a distorted specimen, which is so much con- 

 tracted in the middle as to look like a kidnev bean. 

 Occasionally the anterior side is much shorter than 

 usual, making the shell decidedly inequilateral. Young- 

 shells are flatter ; and the fry are triangular also, and 

 in fact so different in shape that I described and figured 

 it in the ' Annals of Natural History' for January 1858 

 as a distinct species under the name of Diodonta Bar- 

 leei. The portly and protuberant form of the adult, 

 compared with the slim figure of the young, reminds 

 one of 



" the Justice 



In fair round belly with good capon lined." 



Good living will doubtless tell upon the Diplodonta, as 

 well as upon his Worship. 



This species is the D. dilated a of Philippi and Gloco- 

 mene Montaguana of Leach. 



