. The shell book . hemn.) is thelargest species now living. Its oval valves are thin and shallow,the surface faintly cross-striated. The posterior ears are welldeveloped ; the anterior ones are drawn in, forming part of anexcavated area that is sharply angled on the thickened margin 409 The File Shells of the left valve. Through the opening made by this marginalangle, the byssus passes out. Length, 4 to 5 inches. Habitat.— Norway. The Rough File Shell (L. scabra, Dillw.) has its ridgedsurface set with small pointed scales, and covered with a yellow-ish epidermis. The shell is comparatively thi
. The shell book . hemn.) is thelargest species now living. Its oval valves are thin and shallow,the surface faintly cross-striated. The posterior ears are welldeveloped ; the anterior ones are drawn in, forming part of anexcavated area that is sharply angled on the thickened margin 409 The File Shells of the left valve. Through the opening made by this marginalangle, the byssus passes out. Length, 4 to 5 inches. Habitat.— Norway. The Rough File Shell (L. scabra, Dillw.) has its ridgedsurface set with small pointed scales, and covered with a yellow-ish epidermis. The shell is comparatively thick and ovate, withthe large, anterior ears reflected. Length, 2 to 4 inches. Habitat.— Southern Florida, West Indies. The Frilled File Shell (L. squamosa, Lam.) has it?rounded ridges decorated with erect, flat, scaly plates. Thegeneral outline of each valve is obliquely ovate. The ears aresmall and depressed, the hinge oblique. Length, i to 3 niches. Habitat.— Red Sea, Mediterranean, West Indies, MARINE BIVALVE SHELLS The Half-bare Pen Shell, Pinna semi-nuda. 2 The American Thorny Oyster, Spondylus Americanus. 3 The Scaly File Shell, Lima squamosa.
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Keywords: ., bookcentury1900, bookdecade1900, bookidshellbook00r, bookyear1908
