Raymond: Notes on Ordovician TRiLonriES. 75 



Order Proparia Bccchcr. 



Family ENCRINURID^E Linnarsson. 



Genus Cybele Lovcn. 



Cybele prima Ra>moncl. 



Plate XIX, figure 19. 

 Claphuriis primus Raymond, Annals Carnegie Museum, III, 1905, 362, pi. 14, 



figs. 6, 7. 

 Cybele valcourcusis Raymond, ibidem, 1905, 362, pi. 14, fig. 9. 

 Cybele prima Narraway and Raymond, ibidem, 1906, 601. 



The writer has already explained ho\v he ^vas led to describe the cranidia 

 and free cheeks of this species as a species of Glaphurus, and how the 

 fortunate discovery of a nearly complete specimen of Cybele ella by Mr. 

 Narraway gave us our first knowledge of the glabella of an American 

 species of this genus. 



Family CERAURID^. 



Genus Pliomera Angelin. 



Subgenus Pliomerops Raymond. 



Pliomerops canadensis (Billings). 



Plate XVIII, figure 14. 



Pliomera fischeri, the type of the genus, differs from nearly all other 



species usually referred to Pliomera {Amphion of most authors), in having 



3 4 5 



Fig. 3. Pliomera fischeri (Eichwald). Cephalon, showing median furrow and 



denticulate border. After Brogger. 



Fig. 4. Pliomerops canadensis (Billings) Cephalon. From specimen in Carnegie 



Museum. 



Fig. 5. Pliofnerops pseudoraliculatus (Portlock). Cephalon. After Salter. 



a median indentation or furrow in the front of the glabella. The cephalon 

 of that species also has a denticulate frontal border, while the other 

 species have smooth borders. For these reasons the writer has suggested 



