Plang. 



652 



Plangtichnus erraticus, S. A. Miller, N. A. Geol. & Pal. 

 1889, p. 580, fig. 1093, the track of some insect pupa on sub- 

 carboniferous {Kaskaskia) whetstone, Orange Co., Ind. XI, 

 {See Hgure under Treptichnus.) 



Planorbis bicarinatus, campanulatus, parvus, and 

 trivolvis, shells found in the shell marl at Harmonsburg, 

 Crawford Co., Pa. Q4, 41. — PostglaeiaL 



Plant life undoubtedly appeared upon the planet in the 



e Ow. PI. IC 



