380 DlCTYOSPONOID^. 



PLATE LXVI. 

 PHRAGMODICTYA, Hall. 



Page 172. 

 (See Plates LXIV, LXV, LXVII, LXVIII.) 



PlIUAGMODICTyA CATILLIFOBMIS, Whitfield (sp.). 



Page 173. 



(See Plates LXIV, LXV, LXVII, LXVIII.) 



Figure 1. A small l);isal disc with sharp and fine radial striae. 



Figure 2. A portion of a large specimen , show^ing the extremely fine 

 reticulum, the discontinuous vertical ridges and the convexity of the 

 basal disc. 



Pigure 3. A portion of a very broad periloph, showing the fine net-work, the 

 ridged surface and the irregular free margin. 



Figure 4. A part of the reticulum about the apertural margin ; showing scat- 

 tered nodes and nodiform ridges, and a smooth surface at the margin 

 itself. 



Figure .5. A small, nearly entire individual, with broadly expanded aperture. 



This specimen retains the probable outline of the species, except for 



the obli(piity of the lower pai't of the cup. 

 Figure fi. The lower jiortion of an internal cast, showing the convexity of 



the basal plate and the regular convergence of the vertical striae. 

 Figure 7. A small specimen, entire from the basal disc to the aperture; 



showing the expanding form of the cup. 

 Figure 8. A specimen of moderately large size, entire except about the 



aperture, the parts being detached at the basal disc, showing the 



form and depth of the latter and the length and character of the 



j)erilopli. 



Figure 9. The same specimen with the parts brought together into their 

 normal condition. 

 Keokuk group. CfmofordsvilU, Indmna. 



