. Annals of the New York Academy of Sciences. Science. MOOK, VARIATIOX IX SPIRIFER MUCRONATUS 187 attenuatus profundus thedfordense. Primitive form, of Spirifer mucronaius Fig. 6.—Diagram showing the relationships of the fiie mutations of Spirifer mucronaius The tendency in development has been to reduce the shell index, to reduce the number of plications,-to lose the groove and plication on fold and sinus, to strengthen the growth lines and individual plications, to deepen the sinus, and to a certain extent to reduce the actual width of the Please note that these images are extracted
. Annals of the New York Academy of Sciences. Science. MOOK, VARIATIOX IX SPIRIFER MUCRONATUS 187 attenuatus profundus thedfordense. Primitive form, of Spirifer mucronaius Fig. 6.—Diagram showing the relationships of the fiie mutations of Spirifer mucronaius The tendency in development has been to reduce the shell index, to reduce the number of plications,-to lose the groove and plication on fold and sinus, to strengthen the growth lines and individual plications, to deepen the sinus, and to a certain extent to reduce the actual width of the 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 Academy of Sciences. New York, New York Academy of Sciences
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectscience, bookyear1877
