LIST OF COLLABOEATORS FOR THE 

 SECOND EDITION 



Dr. Joseph Augustus Cushman, Foraminifera. 



Dr. T. Wayland Yaughan, Adino::oa. 



Dr. Rudolf Ruedemaxn, GraptolUoidea.' 



Mr. Frank Springer, Cystoidea, Blastoidea, Crinoidea. 



Dr. Arthur Hobart Clark, Post-Paleozoic Crinoidea. 



Dr. Hubert Lyman Clark, Asteroidea, Holothuroidea . 



Dr. Robert Tracy Jackson, EcJiinoidea. 



Dr. Ray S. Bassler, Brijozoa. 



Prof. Charles Schuchert, Brachiopoda. 



Dr. William Healy Dall, Pelecypoda, Gastropoda (pars). 



Prof. JAiiES Perrin Smith, Ammonoidea. 



Dr. Percy E. Raymond, TriloUta. 



Dr. Charles D. AValcott, TriloUta (jMrs), Arachnida (pars). 



Dr. liAY S. Bassler, Branchiopoda, Ostracoda. 



Dr. William T. Calman, Girripedia, Malacostracu. 



Dr. John M. Clarke, Phyllocarida, Arachnida. 



Dr. Alexander Petrunkevitch, Evnholohranchiata, Myriapoda. 



Dr. Anton Handlirsch, Tnsecta. 



VI 



