2 26 NEW YORK STATE MUSEUM 



Hall's description of this form is : 



Fossil occurring free in the shales, or upon other fossil bodies, in 

 slender branching fronds. Branches diverging, lax and slender, with 

 numerous branchlets, both marked by numerous cellules which are usually 

 indicated by the appearance of abrupt expansion and contraction of the 

 branches. 



The angular projection of the cell apertures can be observed in many 

 parts of the fossil. 



The only specimen (holotype) known to me is, according to the locality 



ticket, from the Waldron shale at Waldron, Shelby co., Ind. It consists of 



a valve of Spirifer radiatus that is covered with the thin (.1 mm), 



irregularly fiexuous, glossy black tubes. The latter are as the camera 



enlargements here given show, composed of relatively long tubular thecae, 



which are frequently curved and often project with their distal, irregularly 



bent parts at varying angles from the axis of the branch. They overlap 



about one half their length and number about 21 in 10 mm. The width of 



the branches is but .15 mm-. 2 mm and a continuous rhabdosome has a 



length of 23 mm. The walls of the thecae are relatively very thick and 



their outer aspect is rough and knotty and in some parts appears to be 



somewhat coarsely annulated. 



Chaunograptus gemmatus sp. nov. 



Plate 10, figure 11; plate 11, figures 6, 7 



Description. Rhabdosome small, width of fragment about 1 1 mm ; 

 length but 5 mm ; consisting of stem (.6 mm wide) and alternating, gently 

 curved, slightly upward bending branches. Thecae tubular or elongate 

 bottle-shaped with expanded apertures, growing with proximal two thirds 

 of length in direction of branch and diverging at right angles with distal 

 third, overlapping about one fourth, numbering about 28 in 10 mm. 



Position and locality. The type specimen was collected by the writer 

 in the Utica shale near Dolgeville, Herkimer co., N. Y. 



A small fragment probably referable to this species has also been found 

 in the Ulrich collection. It comes from the: lower third of the Eden shale 

 at Covington, Ky. [pi. ii, fig. 6, 7 |. 



