. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. Figure 116. Pismo clam patterns : Left, typical olam : center, three striped or trident; right, striped. Photograph hy Al Johns for Vernon M. Haden, San Pedro. The outside of the shell is covered with what appears to be a thin coat of varnish, the periostracum, Avliich eraeks and ])eels oft' wlien the shell is exposed to direct sunlight. The inside of the shell has a thin fleshy membrane attached to its whole surface. This membrane is
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. Figure 116. Pismo clam patterns : Left, typical olam : center, three striped or trident; right, striped. Photograph hy Al Johns for Vernon M. Haden, San Pedro. The outside of the shell is covered with what appears to be a thin coat of varnish, the periostracum, Avliich eraeks and ])eels oft' wlien the shell is exposed to direct sunlight. The inside of the shell has a thin fleshy membrane attached to its whole surface. This membrane is the mantle and its function is to secrete (manufacture) the sliell. The smooth inside part of the shell is secreted by the whole mantle while tlie middle ami outer layei's of the shell including the strijies or i-ays and the |)eriostracum are secreted by the thick outer edge of the mantk\ The umbo or beak is the oldest part of the clam and is located at the hinged end. A ligament unites the two halves of the shell ami interlocking teetli below the umbo make up the hinge. It is by these teeth and the impressions of the muscle and mantle attachments that clam shells are identified. The two adductor muscles close the two valves of the clam ; when these muscles are relaxed the hinge ligament causes the sliells to gape Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original California. Dept. of Fish and Game; California. Fish and Game Commission; California. Division of Fish and Game. [San Francisco, etc. ] State of California, Resources Agency, Dept. of Fish and Game
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