coarse, concentric, irregular lines and with sharp, small, oblique, wavy threads. Uncommon offshore. Solecurtus sanctaemarthae Orbigny St. Martha's Razor Clam Plate 3oi North CaroHna to southeast Florida and the West Indies. % inch in length, differing from cinningiamis in being twice as long as high (instead of iV-j. times) and in having stronger sculpturing. Uncommon from shallow water to 2 5 fathoms. Super fa77nly MACTRACEA Family MACTRIDAE Key to Some Genera of Mactridae a. Ligament entirely internal Mulinia aa. Ligament partially external b. Chondrophore set off from ligament by a thin shelly plate: c. Posterior rostrate; shell thin and fragile .... La bios a cc. Both ends rounded; shell thick Mactra bb. Chondrophore not set off by a plate Spisula
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Figure 89. Hinge of the Atlantic Fragile Mactra, Mactra fragilis Gmelin, 2 inches. Genus Mactra Linne 1767 Mactra fragilis Gmelin Fragile Atlantic Mactra Plate 32s; figure 89 North Carolina to Florida, Texas and the West Indies. 2 to 2 ^ inches in length, oval, moderately thin, but strong, and smooth- ish. Posterior slope with 2 radial, small ridges, one of which is very close to the dorsal margin of the valve. With a fairly large posterior gape. Color cream-white, with a thin, silky, grayish periostracum. A4oderately common in shallow water. Rarely reaches 4 inches in length. Mactra calijornica Conrad Californian Mactra Figure 9od Neeah Bay, W^ashington, to Panama.
