486 



MOLLUSCA 



PHYLUM VI 



Subgenera : Lucina s.s. Lam. 1799 {Loripes aiict. )• Shell smooth. Adult wjth the teeth 



and posterior radial plication of the valves obsolete. 

 Tertiary and Recent. 



Prolucina Dall (Fig. 792). Compressed, yrcnate, 

 almost rostrate ; the anterior side larger. Silurian. 



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

 lateral ; teeth and posterior fold present. Tertiary 

 and Recent. 



Codakia Scopoli. Compressed, reticulately sculj)- 

 tured. Tertiary and Recent. 



Miltha Adams (Fig. 790). Compressed, nearly 

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

 Tertiary and Recent. 



Divaricella Martens. Rounded, inflated, valves 

 ornamented with angular divergent grooving. Ter- 

 tiary and Recent. 

 Tertiary and Recent. 



Fio. 7f)3. 



Phacoidcs imlchra (Zitt. and Goub.). 

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



Phacoidcs Blainville (Fig. 793). 



Family 18. Oorbidae Dall. 



' Shell differing from the Lucinidae in being transversely oval, thick, with a heavy 

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



Fic. 794. 

 Gonodiin wfUingi Hauer. Upper Trias ; Sarize am Predil, near Raibl, Tyrol, i/j. 



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

 external, the adductor scctrs oval, and not projecting into the pallial area. Trias to 

 Recent. 



This family is an off"shoot of the Lucinidae, with which it is commonly united. 



> Oonodon Scliafli. {Gorhis p. p. auct.) (Fig. 794). Rounded, plump, concentrically 



LlOl 



striated. Cardinals 



sometimes a weak 



ROlO ' 

 posterior lateral present. Trias and Jura. 



Gorhis Cuv. {Fimbria Megerle, nan Boh.) (Fig. 

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

 sculptured ; each valve with two short cardinals, 

 and anterior and posterior laterals ; adductor scars 

 similai', sub-equal. Jura to Recent. 



Fic. T!)5. 



('oW)j.s ImnoUmttt Ijam. Eocene (Calcaire 

 Grossier) ; Griynon, near Paris, i/i- 



Fic. 700. 

 MjiticUn coarclata Zitt. Tiironian : Oosaii, Austria, i/i- 



