INDIANA PALEONTOLOGY. 120, 



PENT RE MITES PYRIFORMIS, Sey, Rowley. 



Platk 36. Fio. 14. 



The specimen figured is the largest we have yet seen and is not a typical 

 example. The greatest width is at the ambulaeral ends, at the middle of the 

 length. The body is doubly conical. Inter-ambulacral areas tlat. Ambulacra 

 quite flat and but slightly sunken below the bounding plates and rather narrow. 



Deltoids but little more than one-fourth the ambulaeral length and not 

 reaching the summit. The basal plates are one-fourth the entire body length, 

 forming an inverted cone. The fork pieces are more than half the body length. 

 The ventral area is much contracted. Spiracles and anal opening small. 



Greatest length of the specimen, one and a half inches: greatest width, one 

 inch. 



From the Kaskaskia group of Crittenden county, Kentucky, Collection of 

 Mr. G. K. Greene. 



PENTRE MITES PYRIFORMIS, Say, Rowley. 



Plate 36. Fig. 15. 



Figure 15 is a side view of a very elongate young example in which the 

 depth of the basal cup is more than one-third of the body length. The lower 

 half of the basal cup is a slender neck formed by the consolidation or anchylosis 

 of stem joints. The radial plates are long, while the deltoids are minute and do 

 not nearly reach the summit. The ambulacra are broad and sunken below the 

 bounding plate edges. Body slightly lobed. 



Kaskaskia group, Wolf Creek, Breckinridge county, Kentucky. Collection 

 of G. K. Greene. 



PENTRE MITES PYRIFORMIS, Say, Rowley. 



Plate 36. Fios. 16, 17. 



The specimen here figured is normal as to the five ambulacra, but one of the 

 inter-ambulacral spaces is pushed out above, forming a strong central ridge, 

 occupied by an elongate five-sided extra plate. Below the ambulaeral ends the 

 specimen is again normal. This extra plate is a sixth radial. 



The ventral surface is somewhat worn, showing the double character of the 

 spiracles. 



Horizon: Kaskaskia group. Locality; Five miles northwest of Bowling 

 Green, Ky. Mr. G. K. Greene's collection. 



