In the Preface to the Revised Edition of 1948, Edward "Doc" Ricketts wrote:
"The period immediately spreceding the war was an important one for the marine biology of the Pacific, perhaps fro marine biology in general..... the Allee-Schmidt edition of Hesse's Zoogeographybecame available..... This hiatus then is a very good time for an emended edition of Between Pacific Tidesto be issued...The map and the isotherm charts are by Joel W. Hedgpeth, marine biologist of the Texas Game, Fish, and Oyster Commission. For calling our attention to minor errors, herein corrected we have to thank ... Joel Hedgpeth of the Texas Game, Fish and Oyster Commission ...
On page 328, Edward Ricketts acknowledges Joel Hedgpeth for the articles he published as follows:
Hedgpeth, Joel W. 1941. A key to the Pycnogonida of the Pacific Coast of North America. Transactions of the San Diego Society Society of Natural History, Volume 9, Number 26, page 253 to 264.
"Key paper for this group within the area involved - Alaska to southern California. Bibliography includes Hedgpeth 1939 and 1940, and Hilton 1940a and b, apropos papers which appeared since our first printing, and the Scott 1913 item which we missed."
Hedgpeth, Joel W. 1947. On the evolutionary significance of the Pycnogonida. Smithsonian Miscellaneous Collections, volume 106, number 18, page 1 to 53.
"Monographic summary of work done on this group since the 1935 publication of the Helfer and Schlottke "Pantopoda" in Bronn's Tierreichs, with bibliography to date. Proposes that the Pycnogonida be considered as a class or subphylum of the Arthropoda; exact affiliations still obscure. Through the kindness of Mr. Hedgpeth, we were able to examine this important account in galley proof."