514 NEW YORK STATE MUSEUM 



PLATE 13 



Genus corynoides Nicholson 

 Corynoides calicularis Nicholson 



Page .234 



i Group of specimens in natural size x 



6-8 Specimens showing the structure of the rhabdosome ; the sicular and 

 the apertural spines or appendages, x 5 



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



Corynoides gracilis Hopkinson 



Page 237 



2 Group of typical specimens. Natural size 



Transition shale, Sanely Hill, Saratoga co., N. Y. 

 12 Young rhabdosome, consisting of sicula and one theca. x 5 



15 Rhabdosome, showing distinctly its composition of three thecae. x 5 



16 Specimen, showing the sicula and three thecae, as well as the apertural 



spines. . x 5 



The originals of figures 12 and 16 are from the Normanskill 

 shale at the Lansingburg power house; that of figure 15 is 

 from the zone of Diplogr. amplexicaulis, Ruscher's quarry, Troy, 

 N. Y. 



Corynoides gracilis mut. perungulatus nov. 



Page 239 



3 Group of typical specimens (cotypes). Natural size 



9-1 1, 13 Different aspects of typical rhabdosomes, showing the distal 



appendages, x 5 

 14 A young rhabdosome. x 5 



The originals of figures 3, 9, 10, 11, 13 arc from the Normanskill 

 shale at Glenmont, N. Y. ; that of figure 14 from the same 

 horizon at Speigletown near Troy. 



iThe specimens in this and the following groups are in the reproductions too wide by 

 the width of the outlines. 



