. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida. Mollusks. EAST COAST MARINE SHELLS 51 PEDALION ALATA Gmelin. Winged-tree oyster. Shell greatly compressed, right valve al- most flat, the left slightly convex; hinge line short, left valve heavier below hinge, right valve with small sinus for byssal at- tachment opposite the swelling outside; surface smooth or scaly; interior pearly layer not extending to margin; brown, pur- ple or blackish in color; young examples often rayed. Length 3 inches
. East coast marine shells; descriptions of shore mollusks together with many living below tide mark, from Maine to Texas inclusive, especially Florida. Mollusks. EAST COAST MARINE SHELLS 51 PEDALION ALATA Gmelin. Winged-tree oyster. Shell greatly compressed, right valve al- most flat, the left slightly convex; hinge line short, left valve heavier below hinge, right valve with small sinus for byssal at- tachment opposite the swelling outside; surface smooth or scaly; interior pearly layer not extending to margin; brown, pur- ple or blackish in color; young examples often rayed. Length 3 inches. The "tree oyster" attaches itself to mangroves or any solid object in shallow water. It is gregarious, many shells often being fastened together. The writer ob- served it living in Angel Fish Creek on the Florida Keys. PI. 5, Fig. 4 Florida; Bermuda; West Indies PEDALION LISTERI Hanley. Usually a high elongated shell; well developed at base; three to seven pits in each tongue-like process of porcellaneous material in base; Rolor variable, often rayed with a lighter shade. Height 35 mm. PI. 5, Fig. 8 Florida Keys and West Indies PEDALION SEMIAURITA Linne. Shell small, solid, very irregular, large pits in hinge line of each valve; byssal notch obscure. Height 16 mm. It lives in the crevices of rocks and corals. As variable as the oyster It largely conforms to the surface and other local conditions. At the Blowing Rocks, near Jupiter, Florida, it is plentiful not far from the high-tide mark. PI. 5, Fig. 5 Southern Florida and West Indies Family Ostreidae Shell irregular, Inequlvalve, the larger valve adhering to som'e solid object, the outer moving forward as the shell ma- tures; excessively variable according to the position during life and for this rea- son difficult to differentiate the species. GENUS OSTREA Linne 1758 (OYSTERS) OSTREA CRISTATA Born. Crested Oyster. Shell solid, very irregular, upper valve concave or convex; valves with long tubu- lar clasping proce
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Keywords: ., bookcentury1900, bookcollectionbiodiversity, booksubjectmollusks
