. Annual report. New York State Museum; Science; Science. GRAPTOLITES OF NEW YORK, PART 2 193 thecae and two gonangia (the latter opening in the corners between the thecae on the reverse side of the branchlets). The "budding individuals," the third group of individuals do not empty to the outside and are hence not observable in an external view. In the series of sections which we copy here from Wiman [text fig. 94] the separation of a branch with its four individuals and a budding indi- vidual at the lower end in figures F and G, are seen. A. musciformis differs from A. suecicus in h
. Annual report. New York State Museum; Science; Science. GRAPTOLITES OF NEW YORK, PART 2 193 thecae and two gonangia (the latter opening in the corners between the thecae on the reverse side of the branchlets). The "budding individuals," the third group of individuals do not empty to the outside and are hence not observable in an external view. In the series of sections which we copy here from Wiman [text fig. 94] the separation of a branch with its four individuals and a budding indi- vidual at the lower end in figures F and G, are seen. A. musciformis differs from A. suecicus in having a greater number of individuals in each Fig. 94 Series of thin sections of Acanthograptus suecicus (Wiman). The following table explains the lettering: Generation Gonangium Theca Budding individual 1 .... b .... a a b, .... 3 e 1 4 a, b,, .... 5 c, 2 d Fig. 95 A can t h o grap tu s s u e c ic us (Wiman). Fragment of specimen Fig. 96 A c an t h ograp t us mus ci f or m i s (Wiman). Branch, x 10 No individuals open on the branches of Acanthograptus but all indi- viduals originate in them, in groups of three (designated as nourishing individual or theca, gonangium and budding individual), as the thin sections here reproduced show. Acanthograptus is according to Wiman's observations a true genus of the Dendroidea, with a structure corresponding to that of Dendrograptus and Dictyonema. "The only difference between this species (A. sueci-. 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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