60 LUCINID^. 



Although generally known, this cannot be regarded as 

 one of our common species, perfect pairs, especially with 

 the contained animal, being of comparatively rare occur- 

 rence ; single valves are often thrown on shore at various 

 spots where there are extensive sands, chiefly on our 

 southern coasts, as at Ryde and Ramsgate (S. H.), and 

 Studland, near Poole (E. F.). It ranges in depth from 

 shallow water to eighty fathoms (M'Andrew). Amoug its 

 localities may be mentioned Guernsey (S. H.) ; Little- 

 hampton and Selsea Bill, in Sussex (Strickland) ; South- 

 ampton (Jeffreys) ; Torbay, Falmouth (Mont, and Jeff, 

 cab.) ; Scarborough (Bean) ; Scalloway (Jeffreys) ; Zet- 

 land (M'Andrew) ; Bantry Bay in fifteen fathoms, and off 

 Baltimore Harbour (M'Andrew). 



The name of this species finds its way erroneously into 

 many local catalogues, owing to dead and worn valves of 

 young Lucina borealis being mistaken for it. It ranges 

 southward to the Mediterranean, where it is extremely 

 abundant. 



L. FERRUGiNosA, Forbcs. 



Minute, usually covered with a ferruginous coating, beneath 

 which the surface is smooth ; devoid of any fold. Only one denticle 

 in either valve : no oblique cartilage groove on the hinge-margin. 



Plate XXXIV., fig. 1 (magnified). 



Kellia ferruginosa, Forbes, Report of the Brit. Assoc. 1843, p. 192. 

 Artemis'? „ Jeffreys, Ann. Nat. Hist. vol. xix. p. 313. 

 Clausina „ Jeffreys, Ann. Nat. Hist. vol. xx. p. 1 8. 



„ ahyssicola, Jeffreys (not Forbes), Ann. Nat. Hist. vol. xx. p. IS. 



„ Croulinensis, Jeffreys, Ann. Nat. Hist. vol. xx. p. 19. 



The closely-adherent thick ferruginous coating which 

 envelopes and conceals alike sculpture and outline, by 



