Now that all chapters of this part have been published online, the authors are busy making any necessary updates, and soon we hope to announce the availability of the volume in hard copy.
West, Ronald R., Jean Vacelet, Rachel A. Wood, Philippe Willenz, & Willard D. Hartman. 2013. Part E, Revised, Volume 4, Chapter 4A–B: Hypercalcified extant and fossil chaetetid-type and Post-Devonian stromatoporoid-type Demospongiae: Systematic descriptions. Treatise Online 58:1–95, 75 fig. $49.95