VIII. Comparison with Structure of Asterozoa. 1915 316 



VIII. A Comparison with the Structure of Asterozoa. 



[Geol. Mag., N.S., Dec. VI, Vol. II, pp. 316-322 ; July, 1915.] 



rilHE resemblance of the oral face of an Edrioasteroid to an Asteroid 

 •It lias not merely been remarked on by nearly every writer on 

 the group, but lias led many of them to far-reaching conclusions 

 (e.g. Steinmann, 1888 ; Neumayr, 1889). None the less no exact 

 comparison of the structures has yet been made ; nor indeed was such 

 possible until accurate descriptions were available. These have now 

 been provided for various recent and fossil Asterozoa by many writers 

 referred to in the sequel, and especially by Mr. W. K. Spencer (1914, 

 "Monogr. Brit. Paloeoz. Asterozoa"; Palseontogr. Soc). 



