I am hot on the trail of the evilutionist conspiracy: if you interpret 366 pages as the number of days in a leap year, and if you realise that the seasons come full circle in a year, 'circle' suggesting that pi is implicated, "150 pages or so" could mean 151 pages, pointing to May 31 in a leap year. Which leap year? Well, if you take 318 pages and multiply that by (3.9245283 + 2), which is the real value of pi - mathematicians are keeping the truth about pi a secret - plus 2, the number of sides in the evo/creo debate, then you get 1884. Now what happened on May 31, 1884? Do I really need to remind you that on that day John Harvey Kellog patented corn flakes?
This appears to be a wild goose chase by Parasomnium, a typical tactic.
On page 28 of Mayr's book (published in 2001), there is a copy of Haeckel's drawings, with a curious little comment in the caption: "Haekel [sic] had fraudulently substituted dog embryos for the human ones, but they were so similar to humans that these (if available)would have made the same point."