84 KELLIADiE. 



(Thompson, Ann. Nat. H. vol. v. p. 14). Coast of Wex- 

 ford and Waterford (E. F.) ; Dublin Bay (Alder); Bir- 

 terbuy Bay and Arran Isles on west coast (Barlee.) 



In Scotland it is taken on Tarbert Island (Jeffreys) ; 

 Oban (Barlee) ; Orkneys (Thomas). 



The Turtonia minuta was first observed by that most 

 acute naturalist, Otho Fabricius, who found it in Green- 

 land. It is enumerated among Scandinavian shells by 

 Loven, and Recluz states that it is very common on the 

 west coast of France near Cherbourg. 



KELLIA. TuRTON. 



Shell thin, equivalve, subequilateral, suborbicular, tumid 

 or compressed, closed, smooth, or concentrically striated. 

 Beaks incurved, small ; inner margin smooth. Hinge com- 

 posed of one or two primary teeth in either, and a lateral 

 one in both valves. Ligament internal or submarginal ; in 

 some species (Poronia) placed on a cartilage bed, formed 

 of the thickened hinge margins of each valve, in others 

 (Kellia), interrupting the hinge margin. Muscular scars 

 suborbicular, pallial sinus entire. 



Animal suborbicular, its mantle much closed, furnished 

 posteriorly with a single, very short, siphonal (anal) tube, 

 and anteriorly prolonged into a canal or hyaline tube, of 

 considerable dimensions, the margins of which are either 

 united, so that a separate orifice is formed, or open, so as 

 to be continuous with the pedal slit. Foot ligulate, fur- 

 nished with a byssal groove. Branchial leaflets free ; late- 

 ral palps triangular. 



This genus was formed by Turton, for the reception of 

 the Cardium rubrum and Mi/a suhorMcularis of Montagu. 

 Subsequent researches have shewn, that the group so pro- 



