I am cautious about Hickson for a couple of reasons. But he did so much! I should point out a couple of things:
Hickson's description and drawing of the medusa of Millepora does not reflect the actual appearance of the medusae I have seen. It appears to be of a female medusa that is in the process of expelling it's cargo of ova. That illustration has been borne by many of not most Invertebrate Textbooks, as a minor revision of that from Moseley's work, probably drawn by J.J. Wilde, Challenger artist. All of that is another story.
Another extreme example of Hickson's lack of caution was his synonymizing all Millepora species as one: M. alcicornis.
In my mind his work on the reproductive physiology and anatomy of Millepora spp. suspect. One of the volumes replete with illustrations, needs to be studied: I think he got reproduction COMPLETELY wrong for Millepora spp. To be fair, he may have corrected this error in a later publication.
I still think that his abundant visual expositions of Histology of Millepora are worth study, especially for one like myself who is just learning. Caution is the watchword.
These images were captured from Google Books's of
Hickson, S.J., 1891. The Medusae of Millepora Murrayi and the Gonophores of Allopora and Distichopora,"'Quart. Journ. Micr. Sci.,'xxxii.
This seems to be a unique copy, with colored figures. Possibly colored by hand?
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