Note: 6 stories "A merry, extravagant, deliciously satirical, screamingly funny story by the man who wrote Iole. Don't miss it! Lavishly illustrated in color and line by Henry Hutt. Look for the girl on the cover!" --blurb in standalone advertisement, New York Times 1915-11-27 p. 11 Review (earliest found): "Robert W. Chambers, Literary Cartoonist", NY Times -12-05 p. BR492 1915 Appleton title page states "New York and London", and the British Library reports only this edition, BL 000655156 (none found in 1915/16 UK newspapers).

Synopsis: A thematic sequel to In Search of the Unknown. The reader is confronted with even more lost species, including mammoths in the Canadian glaciers, a group of "cave-ladies" in the Everglades, a gigantic worm burrowing beneath the fields of upstate New York, a school of minnows the size of Pullman cars, etc. In Search of the Unknown (1904) and Police!!! (1915): "The Lost Species sequence – [these two collections of linked stories] – features the adventures of a philandering zoologist in his search for unknown beasts ..." --SFE3: Encyclopedia of Fantasy (1997), biog. entry by Mike Ashley