. Annual report. New York State Museum; Science; Science. REPORT OF THE DIRECTOR I9IO 249 width of this specimen must have The the following drawings X^a description of here sfiven and the plate is further tional clearness. The been 13 mm. Plate arrangement. arrangement is based on aided by an examination of the injured area of Syntype A and the cross section of the apotype. The circlet next the stem consists of five, similar pentagonal plates which strongly suggest the IBB of Crinoidea. Above these and alter- nating with them is another circlet of five plates. These are sep- tagonal and sugge
. Annual report. New York State Museum; Science; Science. REPORT OF THE DIRECTOR I9IO 249 width of this specimen must have The the following drawings X^a description of here sfiven and the plate is further tional clearness. The been 13 mm. Plate arrangement. arrangement is based on aided by an examination of the injured area of Syntype A and the cross section of the apotype. The circlet next the stem consists of five, similar pentagonal plates which strongly suggest the IBB of Crinoidea. Above these and alter- nating with them is another circlet of five plates. These are sep- tagonal and suggest the BB of Crinoidea. The two aborad shoulders of each of these plates rest against the orad shoulders of two plates of the first circlet, while their ver- tical shoulders meet each other. There remain three shoulders which lie above their common ver- tical sutures and the uppermost of these is horizontal. Resting on each of these five hori- zontal shoulders is a vertical row of 3 or 4 hexagonal plates which for convenience we may for the present consider as interradial in position. Five other vertical rows of three or four hexagonal plates alternate with the first rows mentioned and we may temporarily consider them as radial in position. Each vertical row of the second series is sup-. Fig. 24, 25 Palaeocystites dawsoni Billings. The former a partial analysis of syntype B. The more distant interradial plates of figure 24 are shaded and the position of the food grooves indicated. It is to be understood that figure 25 shows but half or one side of the conical and cylindrical portions of the theca and that this lower figure is not intended to connect with the upper. The two areas mapped may fail to meet in some places and may overlap in others. The numbers given the plates are simply for convenience in reference. Numbers 55 and below belong to the figured plates of syntype A and the numbers above 55 refer solely to plates of syntype Please note that these images are extracte
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
