Page:American Seashells (1954).djvu/467

Rh 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-