460 



MOLLUSCA 



PHYLÜM VI 



luaximiim m 



resilium suh-internal ; gills filibranchiate ivith cUrect and reßected li7iibs ; foot small 

 digitiform, usually hyssiferous, the byssus passing through the gctpe of the valves. 

 Carboniferoiis to Receiit. 



Lima Bi'ug. Shell inflated, with radial sculpturc ; beaks pointed, and separated 

 by a lozenge - shaped area ; edentuloiis. 

 Carboniferoiis to Recent 

 Mesozoic (over 300 species). 



Subgenera : Lima s. s. {lladula 

 aiict, 71071 Gray) (Fig. 720). Shell wil 

 strong radial ribs. 



Fio. 722. 



Lima (Limatula) 

 it ihbosa S o w. 

 ijower Oolite ; 

 üayeux, Calvados. 



Fio. 720. 



Lima peetinoides Sow. 

 Lower Lias ; Balingen, 

 Würteinberg. i/j. 



Fig. 721. 



Lima {Flagiostoma) gigantea Sow. Lower Lias : 

 Göppingen, Würtemberg. 2/.^. 



Fig. 723. 

 Limaea dupli- 

 cata Goldf. Great 

 Oolite ; Lan grüne, 



Xoi-iiiaiidy. 



Fig. 724. 

 Ctenostreon proboscidea Sow. Oxfordian ; Dives, Calvados. 



Flagiostoma Sow. (Fig. 721). Sniooth or finely striated. 



Limatula Wood (Fig. 722). Medially ribbed, laterally smooth, valves not gaping. 



Limaea Bronn (Fig. 723). Small, with taxodont armatiire at the angles of the 

 hinge. Lias and Recent. 



Ctenostreon Eichw. (Fig. 724). Compressed, irregulär, thick-shclled, with coarse 

 radial ribs. Upper Jura. Badiotella Bittner. Alpine Trias. 



