MORPHOLOGICAL PART. 



55 



TABLE A. 



Ichthyocrinidse. 

 17 



14 



Ichthyocrinidj 

 18 



10 



15 



11 



12 



Rliodocrinidae. Thysanocrinidae. Apiocrinidae (young). Apiocrinidee (adult). 



DIAGRAMS ILLUSTRATING THE EVOLUTION OF THE BASALS AND INERABASALS. 



All figures represent the anal side at the top; « = posterior basal ; h and <? = postero-lateral basals; c and ^== anterior 

 basals ; /, g^ h, i, k = infrabasals. 



