I^o SMITHSONIAN INSTITUTION 



PLATE LXII 



PAGE 



Figs. 1-3. Parichthyocrinus meeki (Hall) 414 



Fig. I. The type, after additional cleaning; showing form of anal area, not seen in Hall's figure. 

 University of Illinois. Warsaw, Illinois. 



20. A magnificent, mature, and almost perfectly rotund specimen, found by the late Lisbon 

 A. Cox, at Nashville, Iowa; anterior view, with proximal part of stem attached, 

 showing the relative shortness and great breadth of the crown. Author's collection. 



2&. Basal view of same with stem removed. Shows IBB entirely covered by the stem, but 

 themselves overlapping BB ; the greatly enlarged post. B, and the anal series follow- 

 ing; the rounded margins bordering the anal area; and the maximum number of 

 interbrachials for the species. 



3. A less mature, almost rotund, specimen from same locality, with stem nearly complete, 

 antero-lateral view ; iBr much fewer than in preceding. Author's collection. 

 Base of Keokuk limestone; Lower Carboniferous. Iowa and Illinois. 



Figs. 4-17. Parichthyocrinus subovatus (Miller and Gurley) 415 



(Also on Plates XXI; LXIII) 



Fig. 4. The type, lateral view. University of Chicago. Near Salem, Indiana. 



5a. A mature specimen, slightly flattened ; from anterior radius, showing maximum number of 



interbrachials. Indian Creek, Indiana. 



5&. Right posterior view of same, showing anal area. 



Sr. Distal view of same, showing closely infolding arms. 



6. Another mature flattened specimen from same colony, anterior view. 



7. Posterior view of similar specimen from same colony ; lower part of anal area narrowed 



by pressure. 

 80. Basal view of less mature specimen, vertically compressed, showing all the rays and anal 



structures in perfect condition ; IBB smaller than column facet, but not within ring of 



BB. Note reduced size of r. post, radial as compared with that of Forbcsiocrinits 



from the same beds, PI. XXVIII. 

 8&. Distal view of same, showing close abutting of arms. 



9. A mature specimen with most of stem attached, same locality and colony. 



10. R. post, view of specimen with IBB visible as low ring below column ;. a, the anal area. 



11. Posterior view of similar specimen. 



12. 13, 14, IS, 16, 17. A series of successively younger specimens from the same colony as the 



seven preceding, showing the diminishing number of interbrachials. 



Upper part of Keokuk Gr. ; Lower Carboniferous. Indiana. All except the type are 

 from Indian Creek, Montgomery County. 

 All specimens except that of fig. 4 are in the author's collection. 



