. Bulletins of American paleontology. Master plication urrow Plication. v-^—Plication Furrow A B Fig. 4. Pattern of plications on the fold and sinus of Ncospirifer camrratus (Morton). \. Pattern on the ventral sinus. B. Pattern on the dorsal fold. The plications of the lateral slopes of both valves are of a non- simple, bifurcating type. There are generally about twenty on each slope. For any given individual the plications on the fold, and sinus, and on the lateral slopes have the same shape. They vary on dif- ferent individuals from being very low, broad and rounded to mod- erately high, wel
. Bulletins of American paleontology. Master plication urrow Plication. v-^—Plication Furrow A B Fig. 4. Pattern of plications on the fold and sinus of Ncospirifer camrratus (Morton). \. Pattern on the ventral sinus. B. Pattern on the dorsal fold. The plications of the lateral slopes of both valves are of a non- simple, bifurcating type. There are generally about twenty on each slope. For any given individual the plications on the fold, and sinus, and on the lateral slopes have the same shape. They vary on dif- ferent individuals from being very low, broad and rounded to mod- erately high, well defined and subangular. On individuals having the former type the furrows between the plications are reduced to mere lines. This is true on the median portion of the shell only, for as the postero-lateral margins of the shell are approached the furrows in- crease in width until they are about twice as wide as the plications are there. They widen at the expense of the postero-lateral plica- tions which are reduced to mere low, rounded lines on this portion of the shell. Those individuals with moderately high, subangular pli- cations have furrows of about the same depth and width as the plications throughout the shell. It is in this latter group that the fasciculation of the plications is best shown. In the former type it is at best poorly expressed. The generally poor expression of the fasci- culation of the plications is a characteristic of this 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 Paleontological Research Institution (Ithaca, N. Y. ); Columbia University. Ithaca, N. Y. , Paleontological Research Institution [etc. ]
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