ORDER III 



TELEODESMACEA 



409 



Family 18. Corbidae. Da 11. 



Shell differing from the Lucinidae in being transversely ova/, thick, with a heavy 

 hinge plate, and usually well-developed laterals; two or three strong cardinals in each* 

 valve ; the margin of the valves denticulate, and the exterior ttrongly tculptwtd : ligament 

 external, the adductor scars oval, mnl ///// ///o/rr////,/ ,'(,, tl,, j,,illi,il area. Tria.- t 

 Recent. 



This family is an offshoot of the Lucinidae, with which it is commonly united. 



FIG. 745. 

 i, Iltiuer. Upper Trias; Sarize am Predil, 



IT Raibl, Tyrol, 



Gonodon, Scliafh. (Gorbis, p. p. auct.), (Fig. 745). Rounded, plump, concentrically 



striated. Cardinals 



L101 



Trias and Jura. 



~r - , sometimes a weak posterior lateral present. 



Corbis, Guv. (Fimbria, Megerle non Boh.), (Fig. 746). Thick -shelled, oval, inflated, 



reticulately sculptured ; each valve with two short 

 cardinals, and anterior and posterior latnal> : 

 adductor scars similar, sub-equal. Jura to Recent. 

 Sphaera, Sow. (Palaeocorbis, Conr.) Lower 

 Cretaceous. Sphaeriola, Stol. Trias to Cretaceous. 

 Fimbriella, Stol. Chalk of Britain. Corbicella, 

 Mor. and Lye. Jura. 



Corbis lamellosa, Lain. Eocene (Calcaire 

 Grossier); Grignon, near Paris. Vi- 



FIG. 747. 

 Mutiella coarctata, Zitt. Turonian ; Gosau, Austria. 1/1- 



Mutiella, Stol. (Fig. 747). Anterior cardinal border corrugated, upturned ; 

 posterior rectilinear, horizontal, with a feeble lateral tooth. Upper Cretaceous. 



Kamily 19. Diplodontidae. Dall. 



Shell sub-circular in outline, rarely nestling and irregular ; hinge with the laterals 

 obscure or absent, and the valve margins plain ; the adductor scars continuous peripher- 

 ally with thepallial line; soft parts like the Lucinidae, but with the external limb of the 

 gills developed, and the anal foramen not tubular. ? Jura, Cretaceous to Recent. 



