taxocrinidae 381 



The Species of Taxocrinus 

 I. iBr none. 



Crown elongate, calyx narrow. 

 Arms tapering rapidly. 

 IIBr 5 or more. 



Stem enlarging at calyx T. macrodactylus. 



Stem not enlarging at calyx T. stultus. 



II. iBr few. 



iBr areas narrow. 

 Crown elongate. 



Arms tapering slowly. 



Calyx narrow, turbinate ; base small. 



IIBr 4. IIIBr inner division longest T. inter scapularis . 



IIBr 5. IIIBr outer division longest T. telleri. 



Crown short and broad. 

 Arms tapering rapidly. 

 IIBr 4 or 5. 

 Calyx narrow, slightly curved. 



Stem not enlarging at calyx T. communis. 



Arms heavy and tapering slowly. 



Calyx broad and massive, subturbihate. 

 Stem enlarging next to calyx. 



IBB within ring of BB T. nobilis. 



Calyx more rounded. 



IBB visible outside of column T. belgicus. 



iBr areas wide, filled with perisome. 

 Crown elongate. 



Calyx spreading. 



Arms heavy, tapering slowly. 

 Arms with nodes on axillaries. 



Anal tube very conspicuous T. lobatus. 



Anal tube very small T. kelloggi. 



Arms marked with wrinkles T. ornatus. 



Arms marked with pustules T. pustulosus. 



Calyx narrow. 



Arms tapering rapidly, surface smooth T. juvenis. 



III. iBr well-developed. 



iBr areas wide, numerous strong plates in lower part. 

 Species attaining large size. 

 Crown short and spreading. 

 IIBr 3. 



Calyx evenly rounded, rays not prominent. 



Arms tapering rapidly from IIBr T. intermedins. 



Calyx pentagonal, rays prominent. 



Arms tapering gradually throughout T. ramnlosus. 



Arms sharply diminishing above IIIBr and spreading 



like claws T. nngula. 



Crown elongate. 



Arms long, regularly tapering. 



Stem enlargement suddenly contracting. 



IIBr 3 or 4 T. colletti. 



Stem enlargement gradually diminishing from calyx. 



IIBr 4 T. praestans. 



