EXPLANATIOX OF PlATE 2. 



Page. 



Fig. 1 . Acavthograptus granti Spencer 56 



(See also PI. 3, fig. 4, and text figs. 72-74.) 

 Gurley's photograph of a specimen, X 1.5, with tlie rhabdosome drawn 

 in black. 



2. Dendrograptus phainotheca, new species U 



(See also text fig. 11.) 

 A retouched photograph of the type-specimen, X 3. 



3. Dendrograptus ])raegracUis Spencer 9 



(See also text figs. 4 and 10.) 

 Photograph of the specimen illustrated in text fig. 10. 



4. Dictymema tenelluia Spencer 28 



(See also text figs. 32 and 33. ) 

 A small portion of a rhabdosome, X 2. 



5. Inocaulls ? tJiallosus, new species 55 



The type-specimen, X 1.5. 



6. Inocaulis ? strldus, new species 54 



(See also text fig. 71.) 

 Photograph of the type-specimen, X 1-5, by Gurley. 

 68 



