The American journal of science and arts . Fig. 3. Fig. 3, represents a second species of thesame genus, which is also probably new. Thelarge valve is deep and ver} gibbous. Its striseare distinct, and resemble the ribs of the Pec-tens. Along with these species occurs a polypifera,apparently belonging to the genus Flustra.

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Keywords: ., bookcentury1800, bookidamericanjournalo341838newh, bookyear1820