220 



NEW YORK STATE MUSEUM 



Dendrograptus gracillimus Ulrich. Cat. Foss. Cincinnati Group 0., Ind. and 



Ky. 1880 

 Dendrograptus gracillimum James. Cin. Soc. Nat. Hist. Jour. 1885. p. 160; 



Pi- 9, fi g- 5 

 Dendrograptus gracillimus James. Cin. Soc. Nat. Hist. Jour. 1892. p. 149 

 Dendrograptus gracillimus Harper & Bassler. Cat. Foss. Trenton and Cincinnati 



Periods in Vicinity of Cincinnati, O. 1896 

 Dendrograptus gracillimus Gurley. Jour. Geol. 1896. 4:95 

 Dendrograptus gracillimus Nickles. Cin. Soc. Nat. Hist. Jour. 1902. 20:68 



Lesquereux considered this form as a Siluric land plant and described 



it as follows : 



Stem very slender, dichotomously branching, smooth or naked half 



round, slightly channeled in the length ; 

 branches numerous, of various length, 

 filiform. 



The stem is scarcely 1 mm thick at 

 the base ; the upper branches curved 

 as from a spiral unfolding, are slender, 

 gradually attenuated and capilliform, or 

 of the thickness of thin thread at their 

 extremities. 



Near Covington, opposite Cincinnati 

 in the bed of the Licking river. Found 

 by Mr Ed. Ulrich, communicated by Rev. 

 H. Herzer. 



Dr Ulrich informs me that the type 



here referred to, has been loaned by him 



Fig. «6-i8 Mastigograptus gr.-iciiiimus to Rev. Herzer and probably sold with 



(Lesquereux). Fig. 116 Copy of original figure. Fig. 



«i 7 ,«i8 Enlargements (x 5) of portions of branches tile Collect ioil of tile Lit tei" tO Prof. f. Hall. 



In that case it is now in the possession of Chicago University which has 

 lately acquired the remainder of Hall's collections and is at present not 

 accessible. Dr Ulrich has, however, been kind enough to send me two 

 specimens which he states are from the same locality and undoubtedly 

 conspecific with Lesquereux' s type (topotypes). 



These have furnished us the following data: 



A stem which has a diameter of .8+ mm is so little compressed that it 



