84 SMITHSONIAN INSTITUTION 



PLATE XXXIX 

 (All fieures natural size except where otherwise stated) 



PACE 



Figs. 1-7. Metichthyocrinus burlingtonensis (Hall) 322 



Fig. I. Maximum specimen with stem and arms complete, flattened. BB showing bej'ond column. 

 2a, b. Perfect crown of about average size, laterally compressed; lateral and basal views. 

 2C. Outline restoration, showing correct proportions, if undistorted, of the pyriform crown. 

 3a. Basal view of somewhat larger specimen. 

 36. Base of same, enlarged. X 2. 

 4a, b. Lateral and basal views of similar specimen, with proximal columnal concealing IBB 



and most of BB. 

 Sa. Smaller specimen, lateral view. 



5&. Base of same enlarged, showing IBB and large BB. X 2. 

 6a. Basal view of a specimen with rays removed beyond IBr; IBB and all of BB except their 



angular points concealed by proximal columnal. X 2. 

 66. Interior view of same, showing IBB and BB. Note how much smaller the inner surface 



of IBB than the outer in the relatively smaller specimen, 56. X 2. 

 7. Section of another specimen vertically fractured, shov.'ing the probable limits of the 



tegmen. X 2. 



Lower Burlington limestone ; Lower Carboniferous. Burlington, Iowa. 



All specimens figured are in the author's collection. 



Figs. 8-18. Metichthyocrinus clarkensis (Miller and Gurley) 323 



Fig. 8. The type ; from near Henr}rville, Clark County, Indiana. University of Chicago. 



ga. Lateral view of a perfect crown, somewhat compressed. Author's collection. 



Knobs south of Louisville, Kentucky. 



o&. Opposite side of same, showing a few sporadic interbrachial plates ; note also the imbri- 

 cation at the sutures. 



gc. Outline restoration of same as it would appear if undistorted, showing the pyriform shape. 



10. Complete nearly rotund crown, with part of stem attached. Author's collection. 



White's Creek, Tennessee. 



no. Base and lower part of a calyx from a knob south of Louisville, Kentucky; dorsal view, 

 showing IBB and BB, the latter visible as small points beyond the column facet. 



116. Ventral view, showing inner surface of same plates. Note their diminished size at the 

 interior. 



lie. Basal and infrabasal plates of same, exterior view; showing small axial opening. X 3. 



lid. Interior view of same; showing diminished size of the plates, and the funnel-shaped tri- 

 lobate rim of the axial opening toward the interior. X 3- 



12. Vertical section through axial opening of another specimen from the same locality, show- 

 ing relative proportions of IBB and BB, and two columnals below them filling the 

 facet. X 2. 



13a, &. Exterior and interior views of another specimen from same locality. 



14. Specimen from Button Mould Knob, Kentucky; basal view. BB visible beyond the column 



facet. 



15. Base of specimen from White's Creek with BB visible as small points beyond the column 



facet. 



16. Smaller specimen from the same locality; BB much larger. 



17. Distal face of IBr, showing articular marking. X 2. 



18. Distal face of two IIBr, showing articular marking. X 2. 



New Providence shales ; Lower Carboniferous. Indiana, Kentucky and Tennessee. 



Figs. 19-21. Metichthyocrinus tiaraeformis (Troost) Hall 323 



Fig. 190. The type ; a perfect, undistorted crown of maximum size, showing the true form and 



proportions ; lateral view. Troost collection ; LT. S. National Museum. White's 



Creek, Tennessee. 

 igb. Basal view of same; showing BB entirely hidden within column facet. 

 19c. Distal view of same; showing full length of infolded arms, not branching beyond HlBr. 

 20a, 6. Lateral and basal views of a smaller specimen from same locality. BB entirely within 



column facet. 

 21. Base of a large specimen from same locality; BB entirely within column facet. 

 New Providence shales ; Lower Carboniferous. Tennessee. 



All specimens except those of figures 8 and 19 are in the author's collection. 



