. Annual report. New York State Museum; Science; Science. GRAPTOLITES OF NEW YORK, PART 2 !93 we have stated before, of phylogenetic importance and expressive of the relative development of the species. It has been utilized in the Mono- graph of British Graptolites for the distinction of four minor groups, all of which are represented in our fauna. By adopting this scheme of subdivision, we obtain the following arrangement of our species : i Dicellograpti in which the thecae have straight ventral walls and horizontal apertures. Type. Die. complanatus Die. complanatus D. mensurans 2 Dicellograp
. Annual report. New York State Museum; Science; Science. GRAPTOLITES OF NEW YORK, PART 2 !93 we have stated before, of phylogenetic importance and expressive of the relative development of the species. It has been utilized in the Mono- graph of British Graptolites for the distinction of four minor groups, all of which are represented in our fauna. By adopting this scheme of subdivision, we obtain the following arrangement of our species : i Dicellograpti in which the thecae have straight ventral walls and horizontal apertures. Type. Die. complanatus Die. complanatus D. mensurans 2 Dicellograpti in which the thecae have approximately straight ventral walls, but slightly intro- verted apertural portions. Type. Die. divaricatus Die. divaricatus var. bicurvatus var. salopiensis var. rigidus var. rectus D. intortus 3 Dicellograpti in which the thecae narrow aperturally, have gently curved ventral walls, and slightly Fig, 207 Dicellograp- introverted apertural portions. rFurs an"Pl NicKho'son- r Jr Fragment of branch show- ing simple form of thecae Type. Die. patulosus D. erurleyi and "pyj'/01""1 reinforce- J* x o j ments of inner margins of -p^ -11 • 1 • i 1 1 1 thecal walls. (Copy from 4 Dicellograpti in which the thecae have ?«»«) markedly curved ventral walls and strongly introverted and introtorted apertural portions. Type. Die. morrisi D. sextans var. exilis var. perexilis var. tortus D. moffatensis var. alabamensis D. elegans D. smithi. 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. Albany : University of the State of New York
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