PLATE XLIX 



PAGE 



Figs. 1-3. FENESTELLA (CYCLOPORINA) ALTIDORSATA n. sp 282 



1. An incomplete, well-preserved frond, X 1.5. 



2. Surface of a slab, X 2, with specimens showing both obverse and 



reverse sides. 



3. A third specimen, X 5, exhibiting the celluliferous face. 



Helderberg formation, Keyser member, Devil's Backbone. 



Fig. 4. SEMICOSCINIUM PLAXUM n. sp 285 



Portion of the non-celluliferous face of the type specimen, x 5. Helder- 

 berg formation, Keyser member, Hyndman, Penna. 



40 



