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80 American Seashells<br />

Figure 26. Various shapes of bivalves, a, sp'mose. (Echmochauia californicaDaW);<br />

b, quadrate (Arcopsis adamsi E. A. Smith); c, orbicular or circular (Divaricella);<br />

d, rostrate {Niiciilmm hamata Cpr.); e, trigonal {Crass'mella); f, fan-shaped or<br />

pectinate {Aeqziipecten irradiaiis miiplicostata Dall); g and h, obliquely ovate and<br />

aequivalve {Crenella cohmibiana Dall); i, elongate {Ensis directiis Conrad); j,<br />

mussel-shaped (Modiolus viodiohts Linne); k, ovate {Spisiilci poJynyrua Stimpson).

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