428 



.Report of the State Geologist 



PLATE LXVI. 

 PHRAGMODICTYA, Hall. 



Page 364. 



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



PHRAGMODICTYA CATILLIFORMIS, Whitfield (sp.). 

 Page 365. 



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



Figure 1. A small basal disc with sharp and fine radial striae. 



Figure 2. A portion of a large specimen-, showing the extremely fine 



reticulum, the discontinuous vertical ridges and the convexity of the 



basal disc. 



Figure 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 obliquity of the lower part of the cup. 

 Figure 6. The lower portion 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 



periloph. 



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

 normal condition. 



Keokuk group. Crawfo/'dsville, Indiana. 



