52 



NEW YORK STATE MUSEUM 



2 SYNOPTIC TABLE OF THE DISTRIBUTION OF THE GRAPTOLITES OF THE SILURIC iONTARJC) OF THE 



UNITED STATES 



i Dendrograptus rectus Ruedemann x 



2 Dictyonema pertenue Foerste. ' x 



3 D. scalariforme Foerste | x 



4 D. retiforme Hall 



5 D. gracile Hall 



6 D. polymorph um Gurley MS 



7 D. subretiforme (Spencer) 



8 D. areyi Gurley MS 



9 Desmograptus pergracilis (Hall &: Whitfield) 



ro Cyclograptus rotadentatus Spencer 



1 1 Ptilograptus hartnageli sp. nov 



j 2 Inocaulis plumulosus Hall 



13 I. divaricatus Hall 



14 Acanthograptus walkeri Spencer 



15 Cactograptus crassus Ruedemann 



16 Palaeodictyota anastomotica (Ringueberg) 



17 P. clintonensis Ruedemann 



18 P. bella(Hall) 



19 P. bella mut. recta Ruedemann 



20 Chaunograptus novellus Hall 



21 Climacograptus scalaris (Hisinger) var. an- 



nulatus Ruedemann 



22 Monograptus clintonensis (Hall) 



33 M. priodon Bronn mut. chapmanensis Rued- 

 emann 



24 Cyrtograptus ulrichi Ruedemann 



25 Retiolites geinitzianus Barrande var. venosus 



Hall 





> 







X 





3 



'J 





~ 



D 





i 



£h 





w 



z, 















u 





7, 



tn 





rj 







c 



^ 



z 



K 





— ; 



< 









*-• 



_^ 



™ 



_ 



— 



7. 



X, 





w 



OTHER 



Kit, IONS 



X? 

 X 

 X 



Mich. 



Niagaran 



of Missouri 



5 Siluric (Ontario) 



The North American Siluric has afforded, in a very few localities it is 

 true, a wealth of dendroid forms that is surpassing all that is known from 

 that age in other parts of the world. Its dendroid fauna comprises 15 

 genera and 60 species and varieties. 1 It is however strangely barren in true 



1 '1 "he next largest is that of Bohemia with S genera and 20 species. 



