. The edible clams, mussels and scallops of California. Mollusks; Shellfish. Fig. 5. Miitilus californianus. One-half natural size. cc. Umbo near, but not at. extreme entl; shelLs frequently bearded; brown, usually solitary, in mud or gravel. Modiolus p. 27 ; pi. 4 , fig 3. Fig. 6. Modiolus rectus. One-half natural size. bb. Adductor muscles equal or nearly so; umbo not at end of valve in forms here treated (except Solen) ; mantle edges fused in at least two places forming two siphonal apertures, which are usually prolonged into siphonal tubes; adults without byssal attachment; usually capable
. The edible clams, mussels and scallops of California. Mollusks; Shellfish. Fig. 5. Miitilus californianus. One-half natural size. cc. Umbo near, but not at. extreme entl; shelLs frequently bearded; brown, usually solitary, in mud or gravel. Modiolus p. 27 ; pi. 4 , fig 3. Fig. 6. Modiolus rectus. One-half natural size. bb. Adductor muscles equal or nearly so; umbo not at end of valve in forms here treated (except Solen) ; mantle edges fused in at least two places forming two siphonal apertures, which are usually prolonged into siphonal tubes; adults without byssal attachment; usually capable of moving about by means of the foot; all capable of burrowing to some extent and habitually doing so ; color of shells various ; never black. True clams c. Valves closing completely, or at least wilh no marked gapuig, siphons com- pletely retractile and not visible in the closed shell. d. Shells thick and strong, animal symmetrical with similar valves, siphons usually united and short; if burrowing not lying on one side, e. Siphons extremely short, not projecting beyond shell when extended ; no pallial sinus; not burrowing deeply. (See Fig. 7; compare with Fig. 8). Cockles Curdinm. 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 Weymouth Frank Walter; California. State Fisheries Laboratory; California. Fish and Game Commission. Sacramento : California State Printing Office
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectmollusks, bookyear192
