ILLUSTRATIONS. IX 



Page. 

 Fig. 55.— Odontoeanlis obpyriforniis, new species. View of the holotype 



showing rhabdosonie and stem enlarged 43 



56 —Odontoeanlis occidentalis, new species. A rather complete 



4-4 

 rhabdosome ^" 



57._Cyclograptns rotadentatus Spencer. Copy of Spencer's figure- 45 

 58._Cyclograptus rotadentatus Spencer. A large specimen from ■ 



the Clinton group, Clinton, New York. (After Ruedemann)_ 45 

 59.— Inocaulis plumulosus Hall. A rather complete rhabdosome__ 47 

 60-62.— Inocaiilis plumulosus Hall. 60, Portion of a branch; Gl. 

 Distal portion of branches showing tubular branchlets and 

 impressions of their apertures; 62, Terminal portion of a 



branch *^ 



63.— Inocaulis ramuiosus Spencer. Copy of Spencer's figure 49 



64_iuocaulis ramuiosus Spencer. Specimen in U. S. National 



■ PiO 



Museum 



65.— Inocaulis cervicornis Spencer. Copy of Spencer's figure 51 



66— Inocaulis phycoides Spencer. The type-specimen and a branch 



enlarged 



67.— Inocaulis diffusus Spencer. Copy of Spencer's figure 52 



68.— Inocaulis diftusus Spencer. Specimen described by Gurley 53 



69. Inocaulis diffusus crassiramus, new variety. Holotype 53 



70.— Inocaulis congregatus, new species. Holotype 54 



71._Inocaulis? strictus, new species. Holotype 54 



72.— Acanthograptus granti Spencer. Copy of Spencer's figure 56 



73, 74._Acanthograptus granti Spencer. 78, Distal portion of 

 rhabdosome; 74, A nearly perfect rhabdosome. (After 



Kuedemann) ^' 



75.— Acanthograptus walkeri (Spencer). Copy of Spencer's figure. 58 

 76 77.— Acanthograptus walkeri (Spencer). Two fragmentary 



specimens 



78-80.— Acanthograptus walkeri (Spencer). 78, Branches showing 

 branchlets and thecal aperture; 79, A specimen, natural size, 

 Rochester shale, New York ; 80, Fragment of branch, Roches- 

 ter shale. New York. (79 and 80 are after Ruedemann) 59 



8i._Acanthograptus pulcher Spencer. Copy of Spencer's figure 60 



82, 83.— Acanthograptus pulcher Spencer. 82, Specimen preserving 



base; 83, Less complete rhabdosome 60 



84._Acanthograptus chaetophorus, new species. Holotype 61 



85, 86.— Acanthograptus multispinus, new species. Two type- 

 specimens 



87.— Thamnograptus bartonensis Spencer. Copied from Spencer.— 63 

 88, 89,— Thamnograptus bartonensis Spencer. Two fragments be- 

 longing to series B ^"^ 



90 91 Thamnograptus'? multiformis Spencer. Copies of Spencer's 



' ' fi 64 



figures 



