1922] ROUND-—ANNULARIA 327 
the sterile whorls. The fourth has a sporangiophore without bracts, 
or arranged as in the modern Equisetum. The same author states 
Fic. £ Fic. 2 
Fics. 1, 2.—Fig. 1, Annularia clarkii: photograph, natural size; fig. 2, Annularia 
clarkii: ne X3. 
further that “in all cases where fructifications have been referred 
to Annularia . . . . they have been proved to be of the Calamo- 
stachys type.” 
