PLATE XXX 



PAGE 



CBYPTOZOON UNDULATUM Bassler n. sp 190 



Edge view of a specimen, two-thirds natural size. In the lower third 

 the laminae are undulated strongly, giving the appearance of 

 vertical columns in cross-section. The undulation is less pro- 

 nounced in the middle third but the laminae are still quite 

 distinct. In the upper third above the black line the distinct 

 lamination disappears and the layers show the beginning of a 

 new growth which is again quite undulating. 



Cambrian (Ozarkian), Conococheague Is., one mile south of 

 Pleasant Hill School (2% miles southeast of Funkstown), 

 Maryland. 



380 



