460 



MOLLUSCA 



PHYLUM VI 



resilium sub-internal ; gills Jilibranchiate with direct and reflected limbs ; foot small 

 digifiform, usually byssiferous, the byssiis i^assing through the gape of the valves. 

 Carboniferous to Eecent. 



Lima Brug. Shell inflated, witli radial sculpture ; beaks pointed, and separated 

 by a lozenge - shaped area ; edentulous. 

 Carboniferous to Recent ; maximum in 

 Mesozoic (over 300 species). 



Subgenera : Lima s. s. {Radida 

 auct., non Gray) (Fig. 720). Shell with 

 strong radial ribs. 



Fig. 722. 



Lima (Limatula) 

 II Ibhosa So w. 

 Lower Oolite ; 

 Bayeux, Calvados. 



Fk:. 720. 



Lima pectinoidcs Sow. 

 Lower Lias ; Balingen, 

 Wurteinberg. i/i. 



Fio. 721. 



Lima (Flagiostoma) gigantea Sow. Lower Lias ; 

 Goppingen, Wurtemberg. 2/.,. 



Fio. 723. 



Limaca dnpli- 

 cata Goldf. Great 

 Oolite ; Langrune, 

 Noriuaudy. 



Fig. 724. 

 Ctenostreon prohoscidea Sow. Oxfoidiaii ; Dives, Calvados. 



Plagiostoma Sow. (Fig. 721). Smooth or finely striated. 



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



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

 hinge. Lias and Recent. 



Ctenostreon Eichw. (Fig. 724). Compressed, irregular, thick-shelled, with coarse 

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



