CLASS PELECYPODA 
179 
cut or broken, color white within and without. Length, 2; height, 1J4 
inches. (Conrad.) 
Type in Phila. Acad. Nat. Sci. ? Type locality, San Diego, California. 
Range. Vancouver Island to the Gulf of California. Also Japan. In 
the Pleistocene at Santa Barbara and San Diego and the Pliocene at Santa 
Barbara, California. 
Family SEMELID7E. 
Genus Semele Schumacher, 1817. 
Shell rounded, subequilateral, beaks turned forward; posterior side 
slightly folded; hinge teeth 2.2, laterals elongated, distinct in the right 
valve; external ligament short, cartilage internal, long, oblique; pallial 
sinus deep, rounded. (Tryon. S. S. Conch.) 
Type. Tellina reticulata Spengler. 
Distribution. West Indies, Brazil, India, China, Australia, Peru, 
west coast of United States. 
Range in Time. Pleistocene, Eocene. 
Semele decisa Conrad, 1837. 
Jour . Acad . Nat. Sci. Phila., 7 :239; pi. 19, fig. 2. 
Shell suborbicular, thick, with ribs thick concentric rugosed, slightly 
prominent ribs; posterior side shorter than the anterior, direct, biangu- 
lated; fold distinct; beaks elevated; color yellowish with faint red rays, 
generally obsolete or wanting; within bright rose red fading into white 
in the center; lateral teeth distinct in each valve. Length, 5 inches. 
(Conrad.) 
Type locality, San Diego, California. 
Range. San Pedro to San Diego, California. In the Pleistocene at 
San Pedro and San Diego. 
Semele striosa C. B. Adams, 1852. 
Plate 9, fig. 3. 
Panama, Shells, p. 291. 
Shell elliptical, slightly flexuous, inequilateral; with the posterior 
dorsal margin slightly excurved, with the anterior dorsal margin concave, 
otherwise with the margin well rounded; pale yellowish brown; with 
numerous fine raised concentric lines, and closely crowded radiating striae, 
which are mostly microscopic; beaks small, approximate; umbones con¬ 
vex; corselet and lunule not well defined. Length, .78; height, .71; 
diameter, .33 of an inch. (C. B. Adams.) 
Type in Amherst College Collection. Type locality, Panama. 
Range. Catalina Island, California, to Panama. 
