124 SMITHSONIAN INSTITUTION 



PLATE LIX 

 (All fieures natural size except where otherwise stated) 



^ PAGE 



Figs. I-I2. Taxocrinus giddingei (Hall) 405 



Fig. I. The type, posterior view. Am. Mus. Nat. Hist. Boonville, Missouri. 



2,3. Posterior view of specimens with the anal side well preserved; showing how the median 

 series is bordered by rather strong, well-formed plates, resembling those of For- 

 beslocrlnus, yet originates on an indentation at the right shoulder of posterior basal 

 as in Taxocrinus. 



4. Posterior view of another specimen with the anal series more distinctly of the Taxocrinus 



type. 



5, 6, 7, 8, 9. Anterior and lateral views of specimens showing the profuse development of inter- 



brachial plates ; and how, instead of rising to an apex filling the area, they have a 

 crescentic distal margin connecting with perisome, and rising at the sides to meet the 

 rays. Note especially figs. 5, 6 and 8 for this. 



10. Enlarged anterior view of another specimen, to show the perisomic integument of small 



plates following the interbrachials. X -■ 



11. Type of S. A. Miller's " Forbesiocrinus elegantulus." 



12. A specimen from Canton, Indiana, perhaps of this species. 



Warsaw or Upper Keokuk Gr. ; Lower Carboniferous. Boonville, Missouri, except 

 as otherwise stated. 



Figs. 13-16, 19. Taxocrinus shumardianus (Hall) 406 



Fig. 13. The type, a rather large, flattened specimen showing iBr touching BB ; anterior view. 

 University of Illinois. St. Louis, Missouri. 



140. A very mature specimen from the original locality at St. Louis ; dorso-ventral view. 

 Shows the taper of the arms to the fourth bifurcation, the exact disposition of the 

 interbrachial plates and how they connect by a broad truncation with the basals. 



14&. Ventral side of same, completely freed from matrix except enough to hold the arms in 

 place. It shows remnants of the tegmen, fallen to the bottom of the visceral cavity; 

 the oral plates somewhat displaced, and not all equally exposed ; one indistinct ambula- 

 crum seen passing in between the orals ; the distal margin of the posterior basal and 

 the small anal tube following it, as well as the rounded margins of the posterior 

 rays adjoining the anal area. 



This figure and the last are drawn reversed from left to right, and certain arms 

 lettered a, a', etc., for comparison; those at e, e' are distended and folded abruptly 

 backward upon themselves to the dorsal side, while those at a, a', b, b', etc., are 

 retracted and folded inward ventrally. 



15. Anterior view of specimen from same locality. 



16. Basal view of small specimen from same locality, showing iBr connecting with all BB by 



definite sutures ; r. ant. interradius at the top. Drawn slightly expanded to show 

 relation of all BB. 

 ig. Lateral view of small specimen from Waterloo, Illinois. 



St. Louis Gr. ; Lower Carboniferous. Missouri and Illinois. 



Figs. 17-25. Taxocrinus huntsvillae n. sp 407 



Fig. 170. Posterior view of small specimen, showing anal tube and bordering perisome. 



Huntsville, Alabama. 

 17&. Stem of this specimen detached, showing IBB fused to top columnal. X 2. 

 18. Posterior view of another specimen from same locality. 



20. Anterior and lateral views of similar specimen from same locality; showing the iBr con- 



necting with BB in varying degrees. 



21. Small specimen from same locality with stem nearly complete, showing the distal lengthen- 



ing of the alternate columnals ; iBr in one area does not connect with B. 



22. Small specimen from same locality in which none of the iBr connect with BB. 



23, 24, 25. Specimens from the higher Kaskaskia beds at the same locality. In these and 

 several others from this horizon, but not in all, the iBr do not connect with BB. 

 Lower part of Kaskaskia Gr. ; Lower Carboniferous. Huntsville, Alabama. 



All specimens figured on this plate, except those of figs, i and 13, are in the author's 

 collection. 



