. Bulletin - New York State Museum. Science. Spirifer cymindis There are seven to eight plications on each lateral slope. In rare instances there is a faint median plication in the sinus. Fine con- centric growth lines with traces of fimbriae cover the surface. The dental lamelfae are short divergent and inconspicuous, the muscle scar of the ventral valve small, well defined, deeply divided by the median sinus. The shell is not greatly thickened about this area and the inner surface adjoining is rarely pustulose. Comparisons. S. concinnus Hall. In this Helderbergian form we have a shell of lik
. Bulletin - New York State Museum. Science. Spirifer cymindis There are seven to eight plications on each lateral slope. In rare instances there is a faint median plication in the sinus. Fine con- centric growth lines with traces of fimbriae cover the surface. The dental lamelfae are short divergent and inconspicuous, the muscle scar of the ventral valve small, well defined, deeply divided by the median sinus. The shell is not greatly thickened about this area and the inner surface adjoining is rarely pustulose. Comparisons. S. concinnus Hall. In this Helderbergian form we have a shell of like proportions but with much more ele- vated ventral beak and broader cardinal area, more abundant plica- tion, lo to 12, greater width of fold and sinus and extended pro- jection of the sinus on the anterior margin. I am here again indebted to Professor Kayser and Dr Drever- mann for affording facilities and suggestion for comparison with European species of the early Devonic. S. arduennensis Schnur [see Schnur. Brachiopoden der Eifel; Palaeontographica. 1854. 3:199, pi. 32, fig. 3; Kayser, Fauna des Hauptquartz. 1889. p. 33, pi. 2, fig. 1-4; pi. 9, fig. 3; pi. 12, fig. 5; pi. 16, fig. 1-9].. 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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