H. M. S. Rattlesnake
Cape York, October, 1849
 My dear Sir.You will probably be interested in knowing what I have been about for the last year. I have examined (in most cases very carefully) species of the following genera of Acalephæ and Polypes: Physophoridæ, Velella, Porpita, Physalia (a good many new points), Stephanomia, Athorybia, Aguina, Rhizophyra; Diphydæ, Resacea, Cuboides (two species), Abyla (three species), Enneagonea; Medusidæ, Sinope (?), Xanthea, Geryonia, Cytæis, Cephea, Oceania, *Bugainvillea, Tima, Aglaura (?), Pelagia, *Willsia; Polypes, Tubularia, besides some genera altogether new. The two I have marked thus * will interest you, as you describe them in your "Naked-eyed Medusæ" Bugainvillea, I may mention, has its generative organ in the thickness of its outer membrane of the stomach; Willsia develops bodies mostly resembling those in Sarsia prolifera and gemmifera, at the angle formed by the two first divisions of each of the four radial canals. The structure of the Tubularia is also very interesting. I was for a long time astonished at what appeared to be its very wide geographical distribution, until I discovered one day that it was attached in large masses to the ship's bottom!
I have found much that was new to me in all respects, but nothing that contradicted in any important matter the results at which I arrived in the paper on the Medusæ. On the other hand, I can speak much more confidently on some points advanced only with hesitation before. I believe that I shall be able to show you on our return evidence amply sufficient to prove,1st, that the Hydroid and Sertularian Polypes, the Hydrostatic and ordinary Acalephæ:, and the Helianthoid Polypes form one large family, which from their invariable and peculiar "thread-cell," I propose to call the "Nematophora"; 2nd, that this great family consists further of two subdivisions, the number of which as affixed, if we consider one subdivision, and strictly analogous and parallel if we consider the two subdivisions as thus:
I believe that I have already evidence enough on the "Hydroid" side, but on the other I have done nothing, or next to nothing. It is a very diffficult investigation, but if this intolerable heat leaves me energy enough I will do something towards it. I am unwilling to write hastily or without due evidence on this matter (especially since the establishment of my views must, as it seems to me, necessitate the total re-arrangement of the "Radiata"), and I mean therefore merely to go on making observations until we return to England. If then I find any means offer itself of publishing my results on an appropriate scale, well and good; if not, I suppose I must content myself with feeling like a "mute inglorious Hampden," and like a good philanthropist, pity the public for its loss.
I have a great advantage in the society and kind advice (to say nothing of the library) of Mr. MacLeay in Sydney. Knowing little of his ideas, save by Swainson's perversions, I was astonished to find how closely some of my own conclusions had approached his, obtained many years ago in a perfectly different way. I believe that there is a great law hidden in the "Circular system" if one could but get at it, perhaps in Quinarianism too; but I, a mere chorister in the temple, had better cease discussing matters obscure to the high priests of science themselves.
Keeping well in mind the old adage about "too many irons in the fire," I have nevertheless been able to make a few scattered observations on other animals than the Acalephæ, and I mean to embody those on the Molluscacomet-wisemaking the "anatomy of Firola and Atlanta" the nucleus whereunto to append a tail of observations on the genera, which will I think possess some interest, referring to the nervous system, structure of buccal mass, and the existence of a peculiar urinary system. I will send this from Sydney to the Secretary of the Zoological Society, with a request that you may, if so inclined, have the first perusal of it.
Our return appears to be very uncertain, perhaps not for a couple of years. If in this remote corner of the earth I can be of any service to you either in a scientific or any other way, pray consider my best exertions as at your command. A letter addressed to me at Sydney will always reach me.
Yours very faithfully,
Thomas H. Huxley
To Prof. E. Forbes