Il8 SMITHSONIAN INSTITUTION 



PLATE LVI 



PAGE 



Figs. i-ii. Taxocrinus colletti White 398 



(Also on Plates XXI, LVII) 



(All specimens more or less flattened) 



Fig. I. The type specimen, anterior view; having normal number of IBr in three visible rays, 

 with variation of 3 and 4 IIBr; and showing abrupt contraction of stem below the 

 tapering enlargement. After White, but corrected by inserting a vertical suture line 

 above the salient angle of the axillary IBr in anterior ray ; the original figure is care- 

 lessly drawn. Whereabouts of specimen unknown. 



2a. A perfect, mature crown, with 3 and 4 IIBr, posterior view. Shows pustulose ornament; 

 base of anal tube and remnants of perisome to the right ; inner margin of rays 

 facing it rounded and without sutural attachment. 



26. The surface ornament, enlarged. X 2. 



;ia, b. Complete mature specimen, with stem and root preserved to the extremity, and some 

 cirri attached toward distal end. It shows perfectly the abrupt change in the column 

 near the calyx, and the beaded markings below, which are characteristic of the species; 

 it has 3, 4 and S IIBr. 



4, 5a. Medium sized specimens with few iBr ; fig. 5 with nearly complete stem, having the 

 pitted appearance due to more or less closely studded peripheral beads upon the edge 

 of the columnals. 



56. Detail of stem on last specimen at the point of contraction, indicating 10 or 12 beads in the 

 circumference, and showing the beginning of alternating columnals at that point. X 2. 



6. Young individual, with only i iBr, and part of stem showing distinct whorl of beads or 

 apparent pits between them ; 1. post. view. 



ya, b. Anterior and posterior views of young specimen, 6 showing anal tube. 



8. Young specimen with stem exceptionally without pitting, showing alternation of columnals 



below the contraction. 



9, 10. Young specimens from Indian Creek ; figure 10 with no iBr, and stem about com- 



plete, showing the great elongation of columnals characteristic of the young stage. 

 lia,b,c. Recuperated specimen from Crawfordsville, with a relatively small crown upon a 

 large stem. The crown was broken off during life, leaving only infrabasals and one 

 basal, all parts above these being restored by a new growth; producing an irregular 

 crown, with 3 new, very unequal BB, and 4 RR, two of which are axillary, thus giving 

 6 rays. 



a. R. ant. view, showing old basal, with distal faces still exposed. X 2. 



b. L. post, view, showing large new basal. X 2. 



c. Diagram, showing form and arrangement of plates ; infrabasals and original 



basal are shaded. 

 Keokuk Group, Lower Carboniferous. Crawfordsville, Indiana, unless otherwise 

 stated. 



All specimens figured on this plate, except fig. i, are in the author's collection. 



