172 



NEW YORK STATE MUSEUM 



p.488] the writer has, misled by information from second hand, remarked in 

 a footnote that D. blairi is a very doubtful graptolite and according to 

 last accounts but the remains of a plant. In doing so an error has been 

 perpetuated, for specimens which Mr Bassler has, upon my request, kindly 

 forwarded to me leave no doubt of this being a true Dictyonema. 



Since no drawings of this most interesting form have been published 

 thus far, I have added a tracing in natural size and camera enlargements. 

 One fragment is the basal part of a rhabdosome and indicates by the 



Fig. 77, 78 Dictyonema blairi Gurley. Fie. 77 Enlargement (x 5) of portion of type specimen. 

 Fig. 78 Fragment showing natural section, x 6. Originals in National Museum 



arrangement of the branches an original infundibuliform shape of the 

 specimen. The sicula is not preserved and the thecae are not well shown 

 in any of the specimens. 



odontocaulis Lapworth 



Odontocaulis Lapworth. Geol. Soc. Lond. Quar. Jour. iSSr. 37:176 



Original diagnosis : 



Gen. char. Polypary cyathiforme, composed of numerous independent 

 and frequently bifurcating polypiferous branches, originating from the distal 

 extremity of a short stem, which is likewise polypiferous, and is terminated 

 proximally in an irregular corneous expansion. Hydrothecae of the type 

 of those of Dictyonema, biserial, subalternate. 



