ORDER III TELEODESMACEA 409 
Family 18. Corbidae. Dall. 
Shell differing from the Lucinidae in being transversely oval, 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 strongly sculptured ; ligament 
external, the adductor scars oval, and not projecting into the pallial area. Trias to 
Recent. 
This family is an offshoot of the Lweinidae, with which it is commonly united. 

Fic. 745. 
Gonodon Mellingi, Hauer. Upper Trias; Sarize am Predil, near Raibl, Tyrol. 1/). 
Gonodon, Schafh. (Corbis, p. p. auct.), (Fig. 745). Rounded, plump, concentrically 
: : L101 : ; : 
striated. Cardinals Roio > Sometimes a weak posterior lateral present. Trias and Jura. 
Corbis, Cuv. (Fimbria, Megerle non Boh.), (Fig. 746). Thick-shelled, oval, inflated, 
reticulately sculptured ; each valve with two short 
cardinals, and anterior and posterior laterals ; 
adductor scars similar, sub-equal. Jura to Recent. 
Sphaera, Sow. (Palaecocorbis, Conr.) Lower 
Cretaceous. Sphaeriola, Stol. Trias to Cretaceous. 
Fimbriella, Stol. Chalk of Britain. Corbicella, 
Mor. and Lye. Jura. 




Fic. 746. 
Corbis lamellosa, Lam. Eocene (Calcaire Beste 
Grossier); Grignon, near Paris. 1/. Mutiella coarctata, Zitt. Turonian; Gosau, Austria. 1/). 
Mutiella, Stol. (Fig. 747). Anterior cardinal border corrugated, upturned ; 
posterior rectilinear, horizontal, with a feeble lateral tooth. Upper Cretaceous. 
Family 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 the pallial 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. 
