INTRODUCTION. 57 



84. ScHUCHERT, C. — " Fossilium Catalogus : 1. Animalia, Editus a F. Freeh," 



' Stelleroidea Palseozoica.' W. Junk, Berlin, 1914. 



85. " Revision of Paleozoic Stelleroidea, with Special Reference to North 



American Asteroidea," ' Bull. 88, U.S. National Museum,' 1915. 



86. VauCtHan, a., " Correlation of Dinantian and Avonian," ' Quart. Journ. Geol. 



Soc.,' vol. Ixxxi, p. 3, 1915. 



87. Spencee, W. K., " A Monograph on the British Fossil Echinodermata from the 



Cretaceous Formations. Vol. 2: The Asteroidea and Ophiuroidea," 

 'Mon. Pal^ont. Soc.,' 1908. 



88. Woodward, A. Smith, "Anniversary Address of the President," 'Quart. Journ. 



Geol. Soc.,' vol. Ixxxi, p. Ixii, 1915. 



89. Bather, F. A., " Studies in Edrioasteroidea, IV. The Edrioasters of the 



Trenton Limestone [Part II] " ' Geol. Mag.,' dec. vi, vol. i, pp. 162- 

 171, 1914. 



90. " Studies in Edrioasteroidea, VIII. A Comparison with the Structure 



of Asterozoa," 'Geol. Mag.,' dec. vi, vol. ii, pp. 316-322, 1915. 



91. " Studies in Edrioasteroidea, I — IX " reprinted, with additional pp. i-xii, 



from ' Geol. Mag.' and published by the author at Wimbledon* 

 October, 1915. 



92. [Review of Schuchert] 'Geol. Mag.,' dec. vi, vol. ii, pp. 425, 426, 1915. 



Addendum to Literature. 



Since I wrote the previous section of this Monograph, Professor Schuchert (84, 

 85) has published a valuable and interesting account of the North American 

 Paleeozoic Asterozoa, which is very illuminating and of special importance to 

 English workers since it now, for the first time, enables clear comparisons to be 

 made between the American and English species. Certain of his theoretical 

 conclusions can also undoubtedly be maintained, and constitute a very appreciable 

 advance in our knowledge. I am, however, unable to agree with his contention 

 that a certain Palaeozoic Starfish, Hudsonaster, is " very near the radicle that gave 

 rise through modification and inheritance to all subsequent Stelleroidea " (85, p. 34), 

 and that " in any event, whatever the ^re-Hiidsonaster evolution was, we are on 

 safe ground in indicating what the developmental changes were, starting with this 

 genus " (p. 36). 



It seems to me that if Professor Schuchert's duties had allowed him to make 

 the same exhaustive studies of the American Ophiuroidea that he has made of the 

 Asteroidea, he would not himself have held to this conclusion. It is to be hoped 

 that he will sometime find leisure to complete his studies, for it is obvious that 

 the American " Ophiuroidea " are worthy of much better description than has, as 

 yet, been given them. Schuchert's classification is as follows : 



