INDIANA PALEONTOLOGY. 97. 



A cross section would hardly be round, the mid-interambulacral areas being 

 slightly concave. 



The anal opening is apparently small. Spiracles unknown. The broad 

 base, the great length of the deltoids and the large size of the fossil itself will 

 serve to identify it. 



It is not unlike an upper Burlington form and somewhat near to Granafo- 

 cr'uius grcotulosus, but much larger than either form. 



Keokuk group, Greene county, Ky. Collection of Mr. G. K. Greene. 



P EN TRE MITES G O D N I, DeFranee, Rowley. 



Plate 30. Figs. 3G, 39, 



In figure 36, a ground specimen, the position of the hydrospire tubes is 

 shown, the dark spots being the central opening and anal aperture. The sub- 

 ambulacral canal is shown in the figure Just over the middle of two hydrospire 

 groups. There seem to be but three hydrospire tubes to the group. 



Figure 39 is a specimen to which 5 or 6 stem joints are attached. The 

 column is small and the joints are thin. 



Both specimens are from the Kaskaskia limestone of Warren county, Ky.. 

 and belong to the collection of Mr. G. K. Greene. 



PENTRE MITES PYRIFORMIS, Say. Rowley. 



Plate 30. Figs. 37, 38, 40, 41, 42, 43, 44, 45. 



This series of specimens gives most of the variation in size and outline 

 noticed in the species. 



Figure 37 is a specimen from Warren county, Ky.. and represents an ex- 

 treme in form, approaching somewhat P. go'loni. 



Figure 38 is a beautiful specimen from Newman's Ridge, Tenn., in which 

 the radial sinuses are deep. A single stem joint is attached. 



Figures 40 and 41 are from Warren county, Ky., and have stem joints 

 attached. 



The appearance of folds about the basal plates is somewhat odd and sug- 

 gests conditions in growth. 



The specimen shown in figures 42 and 43 is a Kentucky specimen and rep- 

 resents the very elongate variety, and is near the form known as P. sytnmeti'iru.s, 

 about five stem joints are attached to this specimen. 



Figs. 44, 45 is a young specimen from Crittenden county, Ky. The ambu- 

 lacra are short and broad, occupying not over one-third of the body length. 



If it is true, as appears, that the deltoids are not visible on a side view, 

 but veiy small and confined to the ventral surface, this little blastoid may 

 represent a new species. 



All these specimens are from the Kaskaskia limestone, and belong to the 

 collection of Mr. G. K. Greene. 



