. Cincinnati quarterly journal of science. Science; Science -- Ohio. Trematis Dyeri—Beyrichia Richardsoni. 347 The range of the three species of Lichenocrinus, thus far described in the Cincinnati Group, may be characterized, so far as known, as follows: the cvateriformis, from low water-mark to 300 feet above; Dyeri, from 200 to 500 feet above; tubereulatits, if it should include the Clarksville specimens, from 500 to 800 feet above, but if the Clarksville specimens belong to a distinct species, then the tuberculatus must be confined to the upper 200 feet or less of the group. Trematis Dijeri
. Cincinnati quarterly journal of science. Science; Science -- Ohio. Trematis Dyeri—Beyrichia Richardsoni. 347 The range of the three species of Lichenocrinus, thus far described in the Cincinnati Group, may be characterized, so far as known, as follows: the cvateriformis, from low water-mark to 300 feet above; Dyeri, from 200 to 500 feet above; tubereulatits, if it should include the Clarksville specimens, from 500 to 800 feet above, but if the Clarksville specimens belong to a distinct species, then the tuberculatus must be confined to the upper 200 feet or less of the group. Trematis Dijeri—(S. A. Miller).. Fig. ^9—Trematis Dyeri. Imperforated valve, enlarged about two diameters. Shell elongate, subovate; valves unequally convex ; upper or im- perforated valve strongly convex; umbo projecting slightly beyond the margin ; surface marked with twenty or more distinctly elevated, regular, concentric lamellse, giving the valve a rough appearance. No punctations have been observed upon this valve, and no radiating strife are visible upon the exterior or interior side. Lower or ventral valve slightly convex; umbo subcentral; surface punctate, and marked with concentric lines; oval slit, for the passage of the pedicle fibers of attachment, narrow, and situate between the umbo and pro- jecting beak of the opposite valve. Hinge and internal structure unknown. Length of specimen |th inch, and greatest breadth about -j^ths inch less. The specimen engraved is from the collection of C. B. Dyer, Esq., in whose honor I have given the specific name. He found it on the hill back of Cincinnati, but its range is unknown. It is an extremely rare fossil. Beyrichia Bichardsoni—(S. A. Miller). Fig. 40—Beyrichia Bichardsoni. Magnified 6J^ diameters. Shell small, somewhat rectangular, rounded at each end, and trun- cated obliquely at the dorsal angles ; narrow border on the ends and. Please note that these images are extracted from scanned page images that may have been digitall
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