INDIANA PALAEONTOLOGY. )36, 



D0LAT0CRINU8 APLATUS, M. & G., Rowley. 



Plate 39. Figs. 6, 7, S. 



The whole of the calyx a^ far out as the top of the second radials and the 

 middle of the first interradials is involved in the deep funnel-shaped basal con- 

 <*avit3^. 



The sharp ridges connecting the nodes near the tops of the first radials 

 form boundaries for the smooth pentagonal funnel. 



Sharp, distinct ridges pass up through the middle of the radial plates, be- 

 coming stronger and more rounded above and slightly keeled at tlie centers of 

 the plates. 



Strong raised lines or ridges radiate outward from the first interradial cen- 

 ters with an occasional node between two lines. 



The interradial plates have no central node but a small bare place not 

 reached b}- the ridges, like a miniature valley among hills or mountains. 



Cross raised lines and nodes occupy the second interradials. 



Strong nodes occur between the branches of the radial ridges. There are 

 fifteen arm openings, three to the ray. 



The first radials :ire hexagonal and involved in the concavity. 



The second radials are quadrangular while the third are pentagonal. 



Of the first plates of the second series, one is an axillary plate while the 

 •other supports but one plate above, making three arms to the ray. 



The first interradial plate is nine sided and but little larger than the plate 

 above it. 



The ventral disk is about as high as th* dorsal cup and with a central pro- 

 boscis, forming a low. broad cone with no noticeable depression between the 

 arm groups. 



The ventral plates are granular-nodose. 



There are from two to three jespiritory slits between each group of arm 

 bases and an equal number between each two arm bases in the group, making 

 quite forty slits in all. 



The proboscis is small. 



The depth of the basal funnel is about ecjual to the depth of the dorsal 

 cup. 



This beautiful little crinoid is found in the Upper Devonian, near Charles- 

 town, Ind., and the figured specimen is in the G. K. Greene collection. 



D O L A T O C R 1 N U S S P R I N G E K I . X. Sp.. ( Rowley) 

 Plate 39. Figs. 9, 10, 11. 



The calix is somewhat tlat about the basal region, there being no concavity 

 save the stem cicatrix. 



