276 THE POTOMAC OR YOUNGER MESOZOIC FLORA. 



cortical layer. The branches, which are like the main stems, go off at long 

 intervals from the same zone, apparently in whorls. They go off usnally 

 at right angles from the main stem and then bend ui)wards at a right angle, 

 so as to be })arallel to the main stem. The branches are often as thick as 

 the main stem. 



Localities: Quite common at Belt and Covington streets, Baltimore. 



Undetermined plant (h). 



Plato CLXIX, Fig. 9. 



This fossil is composed of long cylindrical stems, which send off very 

 obliquely, and apparently in whorls, branches which are similar to the prin- 

 cipal stems. The stems and branches had a stout woody axis, which was 

 surrounded by a cortical layer, succulent in nature, and of considei-able 

 thickness. This latter sometimes leaves a wrinkled and puckered margin 

 to the woody axis, but it is not always preserved. The bases of the 

 branches seem to be swollen, and they are marked by transverse scars, 

 which may be due to the fall of bud-scales, or may be simply wrinkles 

 from shrinking in the cortical layer. The plant may be the stem of CejjJi- 

 alotaxopsis or Baieropsis. 



Locality: It occurs rarely at Covington street, Baltimore. 



Undetermined plant (i). 



Pliitc CLXXIII, Fig. 11. 



This fossil occurs in the form mostly of detached, circular, sheath- like 

 impressions, having a small circular orifice in the center. The imprints 

 show a number of moderately strong nerves or ribs, that radiate from the 

 central orifice and end in spike-like teeth around the margin. Usually a 

 number of these imprints are found near one another, and sometimes vague 

 indications of a stem occur, but too much disguised by maceration to give 

 any idea of the mode of attachment. The imprints look more like sheaths 

 of some Equisefum than anything else. 



Locality: They are not uncommon at Covington street, Baltimore. 



