^ 24 NEW YORK STATE MUSEUM 



PLATE 18 



Genus dicellograptus Hopkinson 



See plates 19, 20 



Dicellograptus cf. complanatus Lapworth 



Page 294 



1 Largest fragment observed. Wrongly reproduced [see enl.] 



Sylvan shale, Arbuckle mountains, Indian Territory 



Dicellograptus mensurans sp. now 



Page 295 



2 Type specimens (cotypes) 



Normanskill shale, Glenmont, N. Y. 



Dicellograptus divaricatus (Hall) 



Page 296 



3 Typical specimen 



Normanskill shale, Stockport, N. Y. 



4 Two specimens with smaller angle of divergence in association 



Normanskill shale, Kenwood, N. Y. 



Dicellograptus divaricatus var. salopiensis Elles & Wood 



Page 300 



5 Typical specimen 



Normanskill shale, Kenwood, N. Y. 



6 Extremely slender specimen 



Normanskill shale, Stockport, N. Y. 



Dicellograptus divaricatus var. rectus nov. 



Page 299 



7 Typical, though fragmentary specimen (cotype) 



Normanskill shale, Glenmont, N. Y. 



Dicellograptus divaricatus var. bicurvatus nov. 



Page 300 



8 Type specimens in association (cotypes) 



Normanskill shale, Kenwood, N. Y. 



