486 



MOLLUSCA 



PHYLUM VI 



Subgenera : Lucina s.s. Lam. 1799 {Loripes auct.)- Shell smootli. Adult with the teetli 



and posterior radial plication of the valves obsolete. 

 Tertiary and Receut. 



Prolucina Dali (Fig. 792). Compressed, arcnate, 

 almost rostrate ; the anterior side larger. Silurian. 



Myrtea Turton (Fig. 791). Rounded, sub-equi- 

 latei'al ; teeth and posterior fold present. Tertiary 

 and Recent. 



CodaJcia Scopoli. Compressed, reticulately sculp- 

 tured. Tertiär}' and Recent. 



Miltha Adams (Fig. 790). Compressed, nearly 

 smooth ; laterals absent, cardinals long, feeble (3 : 2). 

 Tertiary and Recent. 



Divariceila Martens. Rounded, inflated, valves 

 ornameiited with angular divergent grooving. Ter- 

 tiary and Recent. 

 Tertiary and Recent. 



Pkacoides pulchra (Zitt. and Goiib.). 

 . Coral-Rag ; Glos, Calvados. 2/,. 



Phacoides Blainville (Fig. 793). 



Family 18. Oorbidae Dali. 



Shell differing from the Lucinidae in heing transversely oval, thicJc, with a heavy 

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



Pio. 794. 

 Gonodun mellingi Hauer. Upper Trias ; Sarize am Predil, iiear Raibl, Tyrol. Vi- 



valve; the margin of the valves denticulate, and the exterior strongly sculptured 

 external, the adductor scars oval, and not projecting into the pallial area. 

 Recent. 



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

 Gonodon Scliafh. (Gorhis p. p. auct.) (Fig. 794). Rounded, plump, concentrically 



ligament 

 Trias to 



striated. Cardinals 



LlOl 

 ROlO 



sometimes a weak 



posterior lateral present. Trias and Jura. 



Gorhis Cuv. {Fimhria Megerle, non Boh.) (Fig. 

 795). Thick-shelled, oval, inflated, reticulately 

 sculptured ; each valve witli two short cardinals, 

 and anterior and posterior laterals ; adductor scars 

 similar, sub^equal. Jura to Recent. 



Corhis lamellosa Lam. Eocene (Calcaire 

 Grossier) ; Grignon, near Paris, i/j. 



Fio. 79(5. 

 Mutiella coarctata Zitt. Tnronian ; Gosau, Austria. Vi- 



