TAXOCRINIDAE 



359 



iBr present. 

 IIBr 4. 



Crown short, turbinate. 

 Arms tapering rapidly. 



Anal tube narrow, composed of elongate plates. 



iBr prominent and deep E. afhnis. 



Crown elongate, expanding with curved sides. 



Arms tapering slowly (?)■£• amplus. 



IIBr 3 or 2. 



Crown rather short, turbinate, base broad. 



Arms diminishing rapidly at each bifurcation E. fletcheri. 



Crown more elongate. 



Arms tapering gradually E. montanensis. 



Exceptional species, with anal tube like Taxocrinus juglandiformis ; 



small iBr, and apparently a radianal (?)■£• perplexus. 



Insufficiently denned E. gracilis. 



Eutaxocrinus oblongatus (Angelin) 

 Plate XLVIII, figs. 1-4 



Taxocrinus oblongatus Angelin, Icon. Crin. Sueciae, 1878, p. 8, pi. 20, fig. 17. 



Taxocrinus (Gnorimocrinus) oblongatus, Wachsmuth and Springer, Revision Palaeocrinoidea, pt. 1, 



1879, p. 51. 

 Eutaxocrinus oblongatus, Springer, Jour. Geology, XIV, 1906, p. 493, [on p. 515, ? Dactylocrinus~\. 

 Taxocrinus rigens Angelin, Icon. Crin. Sueciae, 1878, p. 9, pi. 18, figs. 7, 8. 



A large species. Crown elongate, greatly expanding from a broad base 

 and attaining greatest width about the last IIBr, where height to width is 3 to 1. 

 Calyx at top of I Ax, 1 to 1.9, spread from base, 1 to 2.7. Anal tube and iBr 

 areas narrow, with few or no iBr. Arms long, gradually tapering, with from 

 6 to 10 bifurcations; the outer branches of the ray and of each division being- 

 larger, and having longer intervals, than the inner. Thus the tendency is toward 

 branching by subordinate ramules, which in turn similarly branch again more 

 than once. Intervals in number of brachials on the outer branches of a ray, be- 

 ginning above IBr, are 7-6-6-5-5; and on the inner, 5-6-5-5-5-4-4, 

 etc. Sutures broadly arcuate. Surface smooth. Dimensions of complete 

 crown : height, 48 mm. ; width, 16.5 mm. ; base, 5.5 mm. 



IBB low and flat, slightly exposed externally beyond the column. BB small, 

 with distal part long, narrow, tongue-shaped; post. B but little higher than 

 others, and its apex very narrow. RR over twice as large as BB, deeply arcuate 

 below. IBr still wider, and increasing upward. IIBr 3, two-thirds as wide as 

 IBr. Further divisions in about the same relative size, the inner branch about 

 two-thirds as large as the outer. All branches and ramules rounded and strong 

 until they disappear by incurving. Lateral faces of lower brachials projecting 

 in small buttress-like nodes. Anal tube short and narrow, resting in a rounded 

 notch on right sloping shoulder of post. B ; in close contact with sides of rays. 



