176 DiCTYOSPONGIDvE. 



230 mm. A basal diaphragm, 140 mm. in greatest diameter, bears a frill 

 45 mm. iu width. 



Locality. Keokuk group. In the calcareous shales, and rarely, in the 

 overlying sandstone, at Crawfordsville, Indiana. 



Pheagmodictta patelliformis, Hall. 



Plate lxv, Fig. 3. 



1884. Phragmodictya patelliformis, Hall. Thirty-fifth Ann. Rept. N. Y. 

 State Mus. Nat. Hist., p. 478. 



The original specimen of this species is a large oval basal obcone Avith a 

 highly eccentric apex. Its major diameter is 132 mm. and the apex lies 32 

 mm. from the nearest margin. The minor diameter through the aj^ex is 100 

 mm., through the center 115 mm. The impressions of the radiating spicular 

 bundles are strong, and the surface of the plate, which has been preserved 

 in a calcareous nodule with its contour undisturbed, is gently convex. The 

 aspect of this basal disc is \inlike that of Phragmodictya catilUformis, in its 

 much more eccentric apex and convex surface. 



Locality. Keokuk group. In the calcareous shales at Crawfordsville, 



Indiana. 



Phragmodictya (?) crebristriata, Hall. 



Plate lxi, Fig. 4. 



1884 Phragmoilictya (?) crehri'itriata, Hall. Thirty-fifth Ann. Rept. N. Y. 

 State Mus. Nat. Hist., pi. 21, fig. 7. 



This fossil which has been illustrated in the place cited but not before 

 described, appears to be an impression of a part of the flaring aperture of a 

 Dictyosponge with an extremely fine reticulum, or part of an outer mould of 

 a basal obcone with obscure nodes at the periphery. The radial spicular 

 impressions, though fine, are distinct, while the reticulating bands are highly 

 obscure. It probably represents a species unlike any of the others here 

 described, but its generic characters are still uncertain. 



Locality. Keokuk group. In the calcareous shales at CraAvfordsville, 



Indiana. 



(?) Phragmodictya lineata. Hall. 



Plate lxviii, Fig. 5. 



1884. Phi'agmodictya lineata, Hall. Thirty-fifth Ann. Rept. N. Y. State 

 Mus. Nat. Hist., p. 478, pi. 21, fig. 8. 

 This name was given, in the work cited, to an imperfect specimen of a 

 small subcylindrical cup, with moderately coarse reticulation and a surface 



