I'ermo-Carboniferous /liiiinonoids of the Glass Mountains 229 



Plate IX. 



Fig. 1-10. .Perrinites vidriensis nov. gen. nov. sp. — ^Zone of Perrinites (Iieon- 

 ard formation). — Two miles northwest of Iron Mountain, (Jlass 

 Mountains. 



Fig. 1, venter; fig, 2, side view; fig. 3, croes-section of one of the 

 largest specimens; natural size. 



Fig. 4, front; fig. 5, venter; fig. 6, side view, of medium-sized speci- 

 men ; natural size. 



Fig. 7, front; fig. 8, venter; fig. 9, side view, of small specimen; 

 natural size. 



Fig. 10, siphonal lobe; external and first lateral saddle of medium- 

 sized specimen; natural size. 



