i8o 



NEW YORK STATE MUSEUM 



lozenge-shaped meshes. There are about six to eight meshes in 10 mm 

 transversely and two to three in the same distance longitudinally in the 

 compressed state. The thecae and the base have not been seen. 



Formation and locality. Discovered by Mr H. C. Wardell in a quarry 

 of the Becraft Cement Co. in the New Scotland beds at Jonesburg on 

 Becraft mountain, near Hudson, N. Y. where in association with Dictyo- 

 n e m a crassum it is not uncommon. 



Remarks. As in the case of Dictyonema crassum, the possi- 

 bility of the identity of this species with the 

 longer known Hamilton form D. cadens Hall 

 V_^_, (D esmograptus devonicus Gurley ) sug- 

 \wT'i/x^^( g ests itself, anc l t° continue the parallel, here also 

 my nfy & i tne similarity is great enough to indicate close 

 / ///j/y-^ relationship but not sufficient to warrant identifi- 

 v))/m\W' r'{\{ W-n f cation, in the face of the considerable time inter- 



Ivl //MT^r va ' ^ rom t ^ ie ^ ase °^ t ^ ie P a l eoc l evon ' c to tne to P 



(f\ '-\ [_V^ of the Mesodevonic. The meshes are in this 



Fifr. 86 Desmograptus becraft- form narrower or relatively longer, so that meas- 



ensis sp. nov. Enlargement (x 3%) of 



portion of type specimen ^^ transverse ly t h ere are cOUIlted more ill 



the same distance, while in the longitudinal direction they are about of 

 equal size. The meshwork looks, therefore, when compared with that of 

 D. cadens, as if it had been slightly pulled in the longitudinal direction. 

 The branches are also somewhat thinner than in the latter form. 



I 



Desmograptus cadens (Hall) 



Plate 4, figure 1 



Dictyonema c ad e n s (nomen nudum) Hall. Can. Org. Rem. Dec. 2. 1865. p.58 

 Desmograptus devonicus Gurley. Jour. Geol. [896. 4:84 



Gurley's description is : 



Polypary very irregular in its mode of growth ; scarcely a true dissepi- 

 ment present. Branches dividing and re-fusing irregularly, leaving round 

 elliptic or round quadrangular (the prevailing type) meshes. The irregu 

 larity renders an accurate count of the branches difficult, but there seem to 

 be about 12-15 m 2 5 mm - The thickness varies considerably though most 



