Callithamnopsis delicatula sp. nov. 



See Plate i, figure 5 



Page 2C3 



1 Fragments of two branches in close approximation indicating 



their production by bifurcation of a single branch 



2 A fragment of thallus showing the habitus of the same and the 



apex. The upper and lower portions lie in different planes of 

 the shale. The specimen shows the effect of current dragging. 

 Trenton limestone, Glens Falls, N. Y. 



Chaetocladus sardesoni sp. nov. 



Page' 204 



3, 4, 7 Fragments of the thallus showing, in natural sections, the 



main branch and the whorls of branchlets 

 5, 6 The apexes of specimens showing the whorls of branchlets 

 8-1 1 Some portions of the thallus more enlarged to show the bul- 

 bous bases of the branchlets and their cavities, possibly con- 

 ceptacles 



Trenton-Galena limestone, Minneapolis, Minn. 



The originals of all figures are in the New York State Museum. 



214 



