PLATE XXV. 



ACTINOPTEKIA EXIMIA. 



Viiga 107. 

 Fig-. 1. A left valve somewhat imperfect on the wiiiff but showing' the form of the l)ody and .surface 

 ornamentation. 



Schohai-ie grit, fichohark: N. T. 



Leptodesma disparile. 



rase 186. 

 See Plate 89. 

 Fig-s. 2, 3. Two right \-alves. The wing- margin of fig. 2 should be sinuate to correspond with fig. ;!. 

 Fig. 4. A left valve. 



Chemung group. McKean Co.. Pa. 



Leptodesma curvatum. 



Page 19K. 

 Fig. 5. The left valve desci-ibed. 



Chemvuig group. McKean Co., Pa. 



