114 SMITHSONIAN' INSTITUTION 



PLATE LIV 

 (All figures natural size except where otherwise stated) 



PAGE 



Fig. I. Taxocrinus nobilis (Phillips) 394 



Fig. ja. The tj'pe, left posterior view. Drawn from a plaster cast of the original specimen in the 

 Gilbertson collection in the British Museum, made after additional cleaning to bring 

 out characters of the base and anal side not shown in Phillips's figures. 

 i&. Direct view of anal area, showing form of posterior basal, x !• 

 ic. Detail of the base, showing BB, and very small IBB. X f • 



Mountain limestone ; Lower Carboniferous. Yorkshire, England. 



Fig. 2. Taxocrinus belgicus n. sp ■. . . 39,5 



Fig. 2(7. A nearly complete crown, anterior view. X 2. Author's collection. 



26. Posterior view ; showing post. B, with first plate of the anal tube in situ. X 2. 

 Tournai Stage, Lower Carboniferous. Tournai, Belgium. 



Figs. 3-11. Taxocrinus juvenis (Hall) 392 



Fig. 3. The type, lateral view. Mus. Comp. Zool. 



4, S, 6, 7, 8, 9. A series of specimens showing the usual habitus of the species, and the varia- 

 tions in IIBr and IBr — fig. 9 having but 2 of the latter. Author's collection. 



10. A large specimen from the same beds apparently of this species, showing strong develop- 

 ment of interbrachials, which are few in the condition as usually found. Author's 

 collection. 



I Id, b. Two views of a specimen with calyx distorted by a piece of a large stem pushed into it 

 (116), giving an entirely different form and proportions from the normal. Author's 

 collection. 

 Lower Burlington limestone ; Lower Carboniferous. Burlington, Iowa. 



Figs. 12-13. Taxocrinus omatus n. sp 393 



Fig. 120. The type; a complete crown, anterior view; showing the full length of some arms, 

 coiled to the extremity. Author's collection. 

 12&. Left posterior view of same; showing the peculiar ornamentation, pustulose in lower part 



and passing into longitudinal ridges in upper. 

 I2C. Detail of surface of IBr, showing pustules. X 3- 

 i2d. Surface of IIIBr, with pustules replaced by ridges. X 3- 



13. Fragment of arms of another specimen, showing same kind of ornament. Author's 

 collection. 

 Lower Burlington limestone; Lower Carboniferous. Burlington, Iowa. 



Figs. 14-18. Taxocrinus ramulosus (Hall) 395 



Fig, 14. A very mature specimen, with iBr profusely developed; anterior view. 



15. Posterior view of a finely preserved specimen, showing the anal and interbrachial 



structures. 



16. Lateral view of specimen with stem attached. 



17. 18. Smaller specimens associated with the foregoing. 



Upper Burlington limestone; Lower Carboniferous. Burlington, Iowa. 

 Specimens in author's collection. 



Figs. 19-20. Taxocrinus pustulosus n. sp 391 



Fig. 19a. The arms from lAx up of a well-marked species characteristic of this horizon, of which 

 the calyx has not been found ; showing the strong pustulose ornamentation. Author's 

 collection. 

 19&. Opposite side of same, showing articulating surfaces of brachials. 

 I9f. Proximal surface of IBr from same, showing it to be of the Taxocrinus form. X 2. 

 20a. Fragment of arms of another specimen, showing same ornament. Author's collection. 

 206. Detail of higher brachial, showing pustules. X 3- 



New Providence shales (Knobstone) ; Lo.wer Carboniferous. Clark County, In- 

 diana, and Button Mould Knob, Kentucky. 



