IT is ten years since the second part of this elaborate monograph was published, but, considering the enormous amount of detail here assembled after personal checking by the author, one cannot complain of undue delay.
Smithsonian Institution: United States National Museum.
Bulletin 82: A Monograph of the Existing Crinoids. By Austin Hobart Clark. Vol. 1: The Comatulids. Part 3: Super-family Comasterida. Pp. vii + 816 + 82 plates. (Washington, D.C.: Government Printing Office, 1931.) 2 dollars.