TAXOCRINIDAE 393 



figured," plate 3, figures 21, 22, Professor Whitfield figured a specimen without arms as the 

 type of the species. This was an error. The type specimen, as stated by Hall (Boston 

 Journal, vol. 7, p. 320) was in the collection of the Rev. W. H. Barris, which was acquired 

 afterward from him by the Museum of Comparative Zoology, Harvard, and is the one 

 figured herein (PL LIV, fig. 3). It bears the label with the original number as received from 

 Dr. Barris, in Whitfield's handwriting, and a figure of it drawn by him was reproduced by 

 Hall as plate 7, figure 3 in the Photographic Plates printed in 1872 under title of State 

 Museum Nat. Hist., Bull. I. 



Type. Collection of Museum of Comparative Zoology as above stated. 



Horizon and locality. Lower Carboniferous, Lower Burlington limestone ; Burlington, 

 Iowa. 



Taxocrinus ornatus n. sp. 



Plate LIV, figs. 12-13 



A large sized species. Crown elongate, moderately spreading below ; height 

 to width at about the eighth axillary 1.7 to 1. Calyx at IAx, 1 to 2.6, with 

 spread from base in same proportion. Arms long, strong, tapering very slowly 

 with relatively short divisions to four bifurcations, with another division in the 

 outer rami, beyond which the arms infold in coils of several whorls; sutures 

 strongly arcuate. iBr spaces wide, with few plates. Surface of calyx plates 

 and lower brachials covered with thinly scattered pustules, which become con- 

 fluent, in the arms, forming distinct longitudinal parallel wrinkles on all the 

 higher brachials. Dimensions of crown in principal type specimen: height, 

 50 mm. ; width, 29 mm. ; base, 8 mm. 



IBB not preserved, probably low; BB low pentagons with obtuse angles. 

 RR and IBr of similar form and size, about two and one-half times as wide as 

 long, slightly increasing upward (a plate wanting in one ray). IBr 3; IIBr 

 usually 4, slightly diminishing upward: IIIBr 5 or 6 inner and 7 or 8 outer; 

 IVBr 8 or 9 outer and 12 or 15 inner, with at least one more division in the outer 

 rami at about the fifteenth brachial. iBr 3 or 4, small with small illBr also 

 present. Anal tube and column unknown. 



The high ornamentation of the arms distinguishes this species from all the preceding, 

 as well as from others in the Burlington limestone. It is very rare ; only one fragment has 

 been found in all the collections in addition to the beautiful type shown by figures 12a, b. 



Types. Author's collection. 



Horizon and locality. Lower Carboniferous, Lower Burlington limestone ; Burlington, 

 Iowa. 



