112 SMITHSONIAN INSTITUTION 



PLATE LIII 

 (All figures, except ib, are natural size) 



PAGE 



Figs. 1-6. Taxocrinus intermedius Wachsmuth and Springer 389 



Fig. la. Type specimen, figured with the first published description in 1888; posterior view, show- 

 ing form of post. B, the anal tube rising from a socket at its right shoulder, and folds 

 in the perisome at the side of the tube. The specimen is not flattened, and shows the 

 natural contour of the calyx. 



lb. Ventral view of the same, enlarged. Shows the tegmen in place; the five orals in their 

 natural position, with calcified ambulacra entering between them and converging to 

 an open mouth. X 2. 



This is the famous specimen which first gave the clue to the tegminal structure of 

 the Flexibilia ; and is the only one ever found with the orals and ambulacra in their 

 normal position and not sunken into the visceral cavity. The original figure has been 

 copied many times. 



2a. Another of the original types, a large flattened specimen ; anterior view, showing the inter- 

 brachials to the third order and perisome following their distal margin. Abnormal 

 in having 2 IBr in 'most of the rays. 



26. Posterior view of same ; showing the exact form of posterior basal, the anal series rising 

 from, it, and the perisome leading to the tegmen. 



2c. Basal view of same with stem removed; showing IBB extending beyond the column facet, 

 nearly equal in size. 



3. Another type figured in 1888, flattened ; r. post, view of complete crown. Shows distal 



margin of iBr, and connecting perisome following its curvature and rising high along 

 the rays; the broad IBr, 3 IIBr, and rapidly diminishing size of the arms, with 

 their coiled distal ends above the tegmen. Owing to pressure the 1. post. R has been 

 pushed against the anal plates, giving an unnatural appearance, and the upper part of 

 the tube is turned edgewise, appearing narrower than it really is. 



4. The fine specimen figured in 1890, Vol. VIII, Geo!. Survey, Illinois, accompanying the 



description first prepared ; somewhat flattened. Left posterior view ; showing the rays 

 in full, the anal tube to nearly its full extent, and the other characters of the species. 



University of Chicago. 

 5,6. Smaller specimens found associated with the above; fig. 6 has 2 IBr. 

 Kinderhook Gr. ; Lower Carboniferous. LeGrand, Iowa. 

 All specimens figured on this plate, except that of fig. 4, in author's collection. 



