. Bulletin - New York State Museum. Science. Rhipidomella musculosa var. Solaris more transverse than in the New York and Grande Greve Oris- kany specimens of R. musculosa, but their specific identity is not greatly veiled. Lower Devonic. Moosehead lake, Baker Brook point; Brassua lake, east side; Moose river at Stony brook, Me. Schizophoria ? amii nov. Shell of medium size, transversely subelliptical in outline. Ven- tral valve with slightly prominent beak which is not depressed but from the umbonal region departs a low median sinus which widens posteriorly and covers one third the width of t
. Bulletin - New York State Museum. Science. Rhipidomella musculosa var. Solaris more transverse than in the New York and Grande Greve Oris- kany specimens of R. musculosa, but their specific identity is not greatly veiled. Lower Devonic. Moosehead lake, Baker Brook point; Brassua lake, east side; Moose river at Stony brook, Me. Schizophoria ? amii nov. Shell of medium size, transversely subelliptical in outline. Ven- tral valve with slightly prominent beak which is not depressed but from the umbonal region departs a low median sinus which widens posteriorly and covers one third the width of the valve at the anterior margin. The dorsal valve is the more convex specially. III, .^'^ s. Schizophoria ? amii in the median region which is elevated into a broad ridge corre- sponding to the concavity of the ventral. From this central ridge the sides slope somewhat abruptly and with a slight depression post- laterally. The surface is marked by fine angular radii very like those of Dalmanella lucia Billings (sp.) and are rapidly increased by implantation. Sometimes these striae are seen to end abruptly in elongate punctae as in some species of Rhipidomella (R. p e n e 1 -. 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 New York State Museum; New York State Museum. Albany : New York State Education Dept
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectscience, bookyear1887
