in perfoliate, decurrent or spiral manner is common among 
seaweeds. Numerous large smooth surfaces with striation 
are often found packed with other marine flora in the sand- 
rock and not unfrequently small circular fractured dots as 
large as small peas on them, indicating broken-off cysts that 
once gave support to large heavy fronds of seaweeds. This 
Fic. 1. Cystiphycus latifrons. 
latter was the case with Cystiphycus latifrons. Our fossil 
shows a lengthy part of a cylindrical stem with a large piece 
of a frond 6x8 inches, covered by about twenty-five cysts, 
or air vesicles, one-half inch thick, elongate globular, trun- 
cate above and tapering downward to their attachment like 
reversed cones. Some are fairly projecting, some buried in 
the rock, others broken off. 
