GRAPTOLITES OF NEW STORK, PART 2 5 1 3 



13 " Rastrites "-aspect, enlarged (x 5) to show thecal aperture and growth 



lines 



14 Natural section of main stipe, showing original stipe with thecal aperture 



(a) and secondary thickening, x 5 



15 Fragment oi rhabdosome, showing secondary thickening of stipe and 



composition of branches oi thecae. x 5 



16 Fragment of stipe with secondary thickening, x 5 



Normanskill shale, Kenwood, Albany co., N. Y. 



All figures are enlarged x 5 ; the originals of figures 6 and 14 are 



in the American Museum of Natural History, all the others 



in the New York State Museum. 



