Are there any varified cases of three or more conjoined fetuses?

I’m currently reading the book Anomolies and Curiosities of Medicine by George Gould and Walter Pyle.

In the chapter discussing conjoined fetuses, they have an extremely short section on “Class I” conjoined fetuses. Class I is referring to cases of three or more conjoined fetuses. During this section they list several cases of this happening, but state at the end that none of these cases were able to be verified to be true.

Being this book was published in 1896, i’m curious to see if there have been any verified cases since then, or if the cases they discuss in the text have been verified.

Thanks.

Apparently at least one case, though extremely rare.