Explanation of Plate 4. 



Page. 



Fig. 1 . Dictyonema spenceri, new species 36 



(See also text fig. 46. ) 

 A portion, of the type^specimen, X 2. 



2. Dictyonema parallehun, new species 37 



(See also text fig. 47. ) 

 View of the distal half of the tj'pe-specimen. 



3. DUtyonema de-smoidgs, new species 34 



■ (See also text figs. 41-43. ) 



Photograph of a rhabdosome, X 2, showing the basal attachment. 



4. Dictyonema polymorphuni Gurley 24 



(See also text figs. 26-29. ) 

 Photograph of the original of text fig. 27, X 1.5. 



5. Acanthograpliis pulcher Spencer 59 



(See also text figs. 81-83.) 

 View of a rhabdosome, X 2, preserving the base. 

 72 



