Bulletins of American paleontology . 222 Bulletin 249 KOKTH-OAEOLnrA GEOLOGICAL 8UEVEY. 313 purpose they attach themselves to a grain of sand, which willgenerally be still found at the point of growth ; some of themiocene ones are nearly half an inch in diameter- POLYPAIEA. A8TRAEA BELLA.—(Fig. 256.) The stars are polygonal, variable, rather deep, lamellarlamellae twelve, with alternating ones, denti-culated, contiguous, or separated by their par-titions. Common in the miocene incrusting shells,and various bodies found in a marl bed. Fig. 256. ASTKAEA.—(Fig. 256a.)Irregularly branched ; stars
Bulletins of American paleontology . 222 Bulletin 249 KOKTH-OAEOLnrA GEOLOGICAL 8UEVEY. 313 purpose they attach themselves to a grain of sand, which willgenerally be still found at the point of growth ; some of themiocene ones are nearly half an inch in diameter- POLYPAIEA. A8TRAEA BELLA.—(Fig. 256.) The stars are polygonal, variable, rather deep, lamellarlamellae twelve, with alternating ones, denti-culated, contiguous, or separated by their par-titions. Common in the miocene incrusting shells,and various bodies found in a marl bed. Fig. 256. ASTKAEA.—(Fig. 256a.)Irregularly branched ; stars deep and rather distant, thoughin some places contiguous as in the Bella; intermediate spaceswithout pores, but bordered by lines to which the lamellaeextends; lamellae denticulated, as in A. Bella, and providedalso with the same number, and similarlv arranged. North Carolina Geol. Sur.: Emmons 223 314 north-oakolina geological survey. The foregoing sketch of the fossils of the marl beds of theeastern counties, is far from being complete. Numerous spe-cies still remain unnoticed and undescribed. It seemed to bedesirable, however, on many accounts, to illustrate some ofthe interesting contents of these beds, which are truly theonly historical mementoes which now remain to us of the ageaduring which they lived. It will appear, on examination, thatI have placed by far the largest number of species in the mi-ocene. I have thus placed them because the shell marl bedscontain so large a number of the acknowledged mioccne fos-sils of Virginia; and besides, there are many which replacemiocene fossils of Euio})e. In conclusion, it is due to myself to remark, that the cir-cumstance under whicli many of the determinations have beenmade, rendered it impossible to consult authorities, and henceit may turn out that many species whicli have been markedas ne
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