. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. FIGURE 1. A cm ( inch) snail, Terebra pedroana, taken ofFshore from Channel Islands Harbor. Photograph by John M. Duffy. The Ventura County specimens represent a range extension of km (40 miles) northeast of their published northern range (Santa Monica) and km (25 miles) northeast of their northernmost ob- served location (Zuma Beach). On April 23, 1969 while conducting a survey offshore from San Mateo Point, Orange C
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. FIGURE 1. A cm ( inch) snail, Terebra pedroana, taken ofFshore from Channel Islands Harbor. Photograph by John M. Duffy. The Ventura County specimens represent a range extension of km (40 miles) northeast of their published northern range (Santa Monica) and km (25 miles) northeast of their northernmost ob- served location (Zuma Beach). On April 23, 1969 while conducting a survey offshore from San Mateo Point, Orange County, California, (117° 'W, 33° 'N), Department biologists noted the presence of clipped semeles, Semele decisa, and sunset clams, Gari californica. We dug out a 1 m^ ( ft 2) quadrat in the cobble rock bottom at a depth of lO.'Z'm (35 ft). This cobble bed is an offshore continuation of intertidal areas known to contain large numbers of bivalves (Fitch 1953). Common littleneck clams, Protothaca staminea, are the most abundant clam in the inter- tidal zone. Other bivalves common there are clipped semeles, sunset clams, common Washington clams, Saxidomus nuttalli, and gaper clams, Tresus nuttalli. We dug to a depth of about 30 cm ( inches) and recovered 13 clipped semeles and 24 sunset clams (Figure 2). I saved the shells of the largest specimens for measurements. The largest clipped semele was 106 mm ( inches) in length and the largest sunset clam was 134 mm ( inches) in length. Fitch (1953) gives the maximum length of both species as mm (4 inches). Coan (1973 a, b) gives a maximum size of 115 mm ( inches) for G. calif ornica and 94 mm ( inches) for S. decisa. While examining specimens at the Natural History Museum of Los Angeles County (LACM), I noted a clipped semele (LACM 67-70) which was mm ( inches) in length and a sunset clam (LACM 67-44). Please note that these images are extracted from scanned page images that may have been d
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