136 THE AMERICAN NATURALIST. |. (Vor. XXXIX. 
ing a discontinuous tract of variable form and width. 
Vessels of the primary zone in a single layer, small with 
sparingly developed thyloses, becoming abruptly larger 
and devoid of thyloses in the second zone, and finally 
sparingly compounded. 
Ray cells (tang’l) chiefly oblong, rather thin-walled. 
4. C. teasi, n. sp. 
