. Annual report. New York State Museum; Science; Science. 302 NEW YORK STATE MUSEUM Dicellograptus intortus Lapworth Plate 18, figures 9, 10 Dicellograptus intortus Lapworth. Ann. & Mag. Nat. Hist. Ser. 5. 1880. 5:161; pi. 5, fig. 19a Dicellograpsus intortus polythecatus Gurley. Jour. Geol. 1896. 4: 70 Dicellograptus intortus Fearnsides. Section C. Belfast 1902. separate, p. 1 Dicellograptus intortus Clark. Geol. Mag. Ser. 4. 1902. 9:498 Dicellograptus intortus Elles & Wood. Monogr. Brit. Grapt. pt 4. (Pal. Soc. 1904.) , fig. 90a, b; pi. 20, fig. a-f Dr Gurley has in 1896 listed a
. Annual report. New York State Museum; Science; Science. 302 NEW YORK STATE MUSEUM Dicellograptus intortus Lapworth Plate 18, figures 9, 10 Dicellograptus intortus Lapworth. Ann. & Mag. Nat. Hist. Ser. 5. 1880. 5:161; pi. 5, fig. 19a Dicellograpsus intortus polythecatus Gurley. Jour. Geol. 1896. 4: 70 Dicellograptus intortus Fearnsides. Section C. Belfast 1902. separate, p. 1 Dicellograptus intortus Clark. Geol. Mag. Ser. 4. 1902. 9:498 Dicellograptus intortus Elles & Wood. Monogr. Brit. Grapt. pt 4. (Pal. Soc. 1904.) , fig. 90a, b; pi. 20, fig. a-f Dr Gurley has in 1896 listed a form from Stockport as D. intortus polythecatus var. nov., stating that it resembles Lapworth's species in the mode of growth, character of thecae and dimensions of branches, but differs in having more thecae in a certain space (32 in 25 mm), the first six or eight of which bear spines almost as long as the thecae, and the mode of growth of Dicranograptus furcatus. The latter form it is said to resemble somewhat when the proximal portion of the rhabdosome is absent, but D. furcatus has "thicker branches (1 mm as against .6 for the present form), the thecae are much coarser and are all provided with strong spines. The loops are also more elongate and ; We have not been able to find either Gurley's types of this variety in the Stockport collection, nor any drawings of the same in his manuscript. Several specimens from Stockport (here reproduced in plate 18, figures 9, 10) agree with the description of D. intortus Lapw., given in the MonograpJi of British Graptolites. From this latter description and the Fig. Li, 222 Dice'io- excellent figures accompanying it, it appears that the grapt us intortus Lap- rarM0some7,laeniPargednsx0s! thecae in the British form number from 11 to 14 in 10 Figuve 22i, that of original of , . piate is, figure 9 mm (28-35 in one inch) and that they also possess spines at the proximal end. This would leave as the only difference the mode
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