. Annual report. New York State Museum; Science; Science. *» GRAPTOLITES OF NEW YORK, PART 2 Dicranograptus furcatus van exilis nov. 1-17 JO/ Fkite 25, figure 8 In the Normanskill shale at Kenwood a variety is found whose branches are barely half as wide as those of the typical form (their width =.5-6 mm). It thereby presents a much differing- aspect. Since the thecae are not more closeh-arranged (they number 12 in 10 mm), they must be relatively longer and narrower. Also the mesial spines are considerably finer and hardly noticeable. No other differences have been observed and the variety see
. Annual report. New York State Museum; Science; Science. *» GRAPTOLITES OF NEW YORK, PART 2 Dicranograptus furcatus van exilis nov. 1-17 JO/ Fkite 25, figure 8 In the Normanskill shale at Kenwood a variety is found whose branches are barely half as wide as those of the typical form (their width =.5-6 mm). It thereby presents a much differing- aspect. Since the thecae are not more closeh-arranged (they number 12 in 10 mm), they must be relatively longer and narrower. Also the mesial spines are considerably finer and hardly noticeable. No other differences have been observed and the variety seems to be very rare. Dicranograptus contortus sp. nov. Plare 23, figure 9 Description. Rhabdosome very small, in the contorted condition but 7 mm long, but the length of a branch was traced to 21 mm ; consisting of. 274 Fig. 275-74 Dicrano. graptus furcatus var. exilis nov. En- Fig. 275-78 Dicranograptus contortus sp. nov. Fig. 275, 276 Enlargements largements (x 5) of bi- (x 5) of typical rhabdosomes. Fig. 277 Biserial portion of a specimen showing the form of serial and uniserial por- the thecae. Fig. 278 The most frequent aspect of the branches, x 5 tions of specimen from Kenwood, X. V. a short biserial portion, which is 3 mm long and .8 mm wide, and contains live thecae on either side and of relatively thick, uniserial, uniformly wide (.7 mm) branches which in the compressed specimens are intricately con- torted. The sicular extremitv is rounded, furnished with longr vireella and conspicuous lateral spines. The sicula has not been observed. The thecae are short and wide, very closely arranged, numbering 18 to 20 in the space of 10 mm; overlapping apparently one third of their length; the ventral. 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 Ne
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectscience, bookyear1902
