142 CANADIAN FOSSILS. 
The branches are flexuous, filiform, and as far as traced, simple ; rounded 
or somewhat flattened as they occur in the stone. The substance of the 
stipe or branches does not show cellules ; and the markings are groove-Jike 
depressions in the stipe for a short distance below the base of the branches. 
The test is corneous, black and shining. 
This species differs from JZ. typus of New-York, in its less rigid 
appearance, flexuous stipe, and more diverging branches. 
EXPLANATION OF Ficure oF THAMNoGRaPTUS ANNA, Hall. 
Puate XXI. 
9. A fragment of the species, of the natural size. 
Formation and Locality.— Quebec group ; three miles above the mouth 
of the river Ste. Anne. 
