LUCINIDAE 385 



monly with a thin, yellowish gray periostracum. Irregular coarse growth 

 hnes present. Uncommon from 4 to 139 fathoms. Closely related to T. dis- 

 juncta Gabb, if not that species. 



Fainily LUCINIDAE 

 Genus Li^cina Bruguiere 1797 



Shell orbicular, strong and laterally compressed. Cardinal teeth small, 

 obscure in the adults, but the laterals are well-developed. The use of Lucina 

 here is based on Anton's designation of pensylvanica Linne as the genotype. 

 The genus Linga Gregorio is this genus. 



Subgenus Lucijia s. str. 

 Lucina pensylvanica Linne Pennsylvania Lucina 



Plate 38h 

 North Carolina to south Florida and the West Indies. 



I to 2 inches in length, ovate, usually quite inflated. Concentric ridges 

 very delicate and distinct. Color pure-white with a thin yellowish periostra- 

 cum. Lunule heart-shaped, well-marked and raised at the center. The fur- 

 row from the beak to the posterior ventral edge of the valve is very pro- 

 nounced. Beachworm specimens become smooth and shiny-white. The 

 species name was incorrectly spelled by Linne. Moderately common in shal- 

 low water. 



Subgenus Here Gabb 1866 

 Lucina sonibrereiisis Dall Sombrero Lucina 



Figure 78b 

 Southern Florida. 



^4 inch in length, oval, greatly inflated and pure white in color. No 

 radial sculpture. Concentric riblets numerous, sharp and irregularly crowded. 

 Concentric growth irregularities commonly make the outer surface wavy. 

 Commonly dredged off Miami from 20 to 90 fathoms. 



Subgenus Bellucina Dall 1901 

 Lucina aiitiaiitus Dall Lovely Miniature Lucina 



Figure 78c 



North Carolina to both sides of Florida. 



% to % inch in length, not quite so high, quite obese, thick-shelled, pure- 

 white in color and beautifully sculptured with 8 to 9 wide, rounded, radial 

 ribs across which run numerous, small concentric riblets. Near the posterior 

 upper margin of the shell there is a radial row of about 8 to 1 1 small, scale- 



