TELLINA. 389 



parent rays on a white ground : the posterior side is not 

 flexuous, gaping, produced, or angular, but abruptly truncate 

 and somewhat rounded : both of the lateral teeth in the right 

 valve are near the beak, instead of the posterior lateral being 

 placed at a distance from it, owing to the relative extent of that 

 side in the two species. L. 0-2. B. 0-35. 



Habitat : Sandy ground, at depths of from 3 to 

 85 fathoms, on most of our coasts. I will enumerate 

 a few localities : — Balta Sound and the deep sea or 

 11 outer haf " in Shetland (J. G. J.) ; Orkneys and north 

 of Scotland (M'Andrew) • west of Scotland (Bedford 

 and others) \ Cork (Humphreys) ; Galway (Barlee) ; 

 Dublin Bay (Walpole and Kinaghan) ; Coquet and 

 Berwick Bay (Mennell) ; Holy Island, Northumberland 

 (Alder) ; Fowey (Barlee) ; Land's End (Hockin and 

 Mus. Turton.) ; Plymouth, Exmouth, and Channel Isles 

 (J. G. J.). It is not uncommon on the Scandinavian 

 coasts, from West Finmark to Bohuslan, in 10-25 fa- 

 thoms ; but it does not appear to have been found or 

 noticed south of Great Britain. Philippi first described 

 it as a fossil of the Sicilian tertiaries, adding te in Ger- 

 mania, ad Casselam, Freden, &c." 



The shell exhibits in every stage of growth the marks 

 of difference above specified with regard to T. donacina ; 

 and I have never seen any intermediate specimens. Yet 

 such may exist. It is somewhat suspicious that the 

 present species is only found north, and the other south 

 of Great Britain. Both conjointly seem to inhabit no 

 other coasts but our own. Further investigations may 

 clear up the point as to the specific value of T. pusilla. 



Philippi must have inadvertently communicated to 

 Loven the MS. name of 9t pygm&a," this species having 

 been published by the former in 1836 as "pusilla" 



The T. calcarea of Chemnitz == T. lata, Gmelin = T. 

 sabulosa,S])eT\g\eY-= T.inco?ispicif a, Uroderi]) and Sowerby 



