. Bulletin - United States National Museum. Science. DENDROID GRAPTOLITES OF HAMILTON, ONTARIO. 43. Fig. 53.—Odontocadlis (Spencer). A AND A liRANCH OF SAME EX- LAucEL). ( After '- rvAi. ) In spreading gently above in nndnlations tlie branches are more or less parallel and situated closely together, and are connected occasionally with exceeding fine transverse bars. The texture is corneous, with the surface obliquely striated and marked witli ellipsoid pits, which in some places indicate the orifices of the cells, of which there were about two for every millimeter of l
. Bulletin - United States National Museum. Science. DENDROID GRAPTOLITES OF HAMILTON, ONTARIO. 43. Fig. 53.—Odontocadlis (Spencer). A AND A liRANCH OF SAME EX- LAucEL). ( After '- rvAi. ) In spreading gently above in nndnlations tlie branches are more or less parallel and situated closely together, and are connected occasionally with exceeding fine transverse bars. The texture is corneous, with the surface obliquely striated and marked witli ellipsoid pits, which in some places indicate the orifices of the cells, of which there were about two for every millimeter of length of branch. The branches are rarely connected by minute crossbars. The general outline is that of a regular oval form, whose length, in the most perfect specimens, is 3 cm. (be- sides the counnon stipe, which extends another centi- meter), and breadth, 2 cm. The branches are not more than a quarter of a millimeter broad, while the stipe is about double that thickness. This exceedingly beautiful frond in general appear- ance closely resembles C. salteri of the Quebec grouj) but somewhat smaller, though there is some variation in the size of this species. FoniHition and localitt/.—This species occurs on the shaly surfaces of the Niagara dolomites at Hamilton, Ontario. Gurley's notes are as follows: (jf this species five specimens, certainly conspecific, were seen. The one figured in text figure 54 differs slightly from Spencer's figure in having the branches somewhat more closely arranged, but in spite of this the identification seems to me almost certain. This specimen has about 50-55 branches in 25 mm. of width. The branches are about mm. wide. The dissepiments would seem to have been some- what numerous; being very delicate, however, most of them are covered or destroyed. One specimen in the Spencer collection shows the basal stem and the proximal portion of the polypary. Dissepiments are present. The basal stem bears two distinct thec:e at its summit and obscure
Size: 1444px × 1730px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
