408 MOLLUSCA SUB-KINGDOM VI 
Lucina, Brug. (Figs. 741-744). Rounded, convex, or lenticular, usually with a 

Fic. 741. 
Lucina (Miltha) gigantea, Desh. Eocene (Calcaire Grossier); Grignon, near Paris. 2/3. 
Iunule; with delicate, concentric, cr more rarely radial sculpture; dentition usually 

Fic. 742. Fic. 743. 
Lucina pulchra, Zitt.and Goub. Coral-Rag; Lucina (Prolucina) prisca, His. Silurian; Gottland. 
Glos, Calvados. 2/3. Internal cast (after Roemer). 
normal, the laterals developed. Represented by upwards of 300 fossil and 100 recent 
species. ? Silurian, Trias to Recent. 
Sub-genera: Lucina s.s., Lam. 1799 (Loripes, auct.) Shell smooth. Adult with the 
teeth and posterior radial plication of the valves obsolete. 
Tertiary and Recent. 
Prolucina, Dall (Fig. 743). Compressed, arcuate, 
almost rostrate ; the anterior side larger. Silurian. 
Myrtea, Turton (Fig. 744). Rounded, sub-equi- 
lateral ; teeth and posterior fold present. Tertiary and 
Recent. 
Codakia, Scopoli. Compressed, reticulately sculp- 

Fic. 744. tured. Tertiary and Recent. 
Lucina (Myrtea) columbella, Lam. Mio- Miltha, Adams. (Fig. 741). Compressed, nearly 
cene ; Steinabrunn, near Vienna. smooth ; laterals absent, cardinals long, feeble (3. 2). 
Tertiary and Recent. 
Divaricella, Martens. Rounded, inflated, valves ornamented with angular divergent 
grooving. Tertiary and Recent. 
