MONOGRAPH OF THE EXISTING CBINOIDS. 



183 



Earliest ainoids. 

 The study of the true significance of the various structures possessed by the 

 recent conoids necessitated a similar study of the same structures in many fossil 



Fig. 115. 



Fig. 116. 



Fio. IIT. 



Fig. lis. 



^o. 11^118.-115. L.X.K.. VI.W o. . VOV.O ----;/--r rrK^^e: L^^^^^^^^^^^ r^':^:::i^:i: 



RAVIN THE FOREGROUND 19 THE LEFT POSTERIOR (^^^^^^^^V.^—O IN THE CENTER THE ANAL INTERRAI.irS AND THE 

 - ^---X^e': rn^C^ ^e" r UrVE^Ar^W OfTe'e:^^^^^^^^^^^ O^ a VO,^. S^KCEN O. THAV. 



:^^=:^^ -— ™ tr ::;^=^H-:i=rus:?:T^i^ 



^.THl^rR^S^rlTV^ror^^^^^^^^^^^ 



p. H. Carpenter). 



types, and the further this study progressed the more it was inipressed upon me 

 Zt he pala^ontological succession of crinoid tj-pes is not at all to be trusted m 

 matters o^f crinoid ^hylogeny, except possibly on the basis of broad averages. 



