. College collection of palaeontology. . ORDER LYOPOMATA. Valves not united along a hinge-line; mantle lobes free; intestine with an anal aperture. FAMILY CRANID-ffi. Shell orbicular; no hinge, dorsal valve limpet-shaped. Animal attached to objects by the ventral valve. No. 405. Crania scabiosa, Hall, Dating from the Lower Silurian, with 37 fossil species; the group is still living. Cincinnati Group, Cincinnati, Ohio. FAMILY DISCINID^. Animal attached by peduncle passing through the ventral valve; arms fleshy. Ranging from the Silurian to the present time. No. 406. Discina nitida, Phil. Upper
. College collection of palaeontology. . ORDER LYOPOMATA. Valves not united along a hinge-line; mantle lobes free; intestine with an anal aperture. FAMILY CRANID-ffi. Shell orbicular; no hinge, dorsal valve limpet-shaped. Animal attached to objects by the ventral valve. No. 405. Crania scabiosa, Hall, Dating from the Lower Silurian, with 37 fossil species; the group is still living. Cincinnati Group, Cincinnati, Ohio. FAMILY DISCINID^. Animal attached by peduncle passing through the ventral valve; arms fleshy. Ranging from the Silurian to the present time. No. 406. Discina nitida, Phil. Upper valve limpet-shaped; lower or ventral valve fiat or conical; 64 fossil and 10 living species, ranging from the Silurian age. Coal Measures, Spring- field, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ward's Natural Science Establishment, inc. Rochester
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