Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 5. (Budapest 1954)
Kolosváry, G.: On the known fossil Hydrozoa of Hungary
Cretaceous As rich as the Hungarian Triassic and Jurassic were in Hydrozoa, even ' so the two finds of the Lábatlan Neocom,from the Köszörűkőbánya and the Póckő, reveal but little to us. Of the first, unfortunately, nothing more can be established than that it is a Hydrocorallid. All Mesozoic Hydrozoa die out in the Cretaceous, in the whole world. Maybe extinction is the cause of their rarity in our Cretaceous beds. The Póckő find is a Milleporidium. Diameter of the colony is 7x8 mm, imbedded in breccial coralline limestone. Eocene I have examined only the material found in the Transdanubium of the rich Hungarian Eocene. We have, therefore, no data as yet from the Upper Eocene of the Mts. Bükk. A Milleporidium-Wkt find comes from the Eocene coralline marl of the Remetehegy in Budapest — besides this, the following species are met with in the Transdanubian Eocene : »Mille por m sp.,Bajót, Tokod, Felsőgalla ; »Millepora dalmatina« Oppenheim*, Tokod,Mogyorós, Bajót, Felsőgalla, Nagyganna ; Millepora nodosa Esper, Felsőgalla ; Millepora depauperata Reuss, Bajót, Tokod, Felsőgalla; »Millepora reussk Kühn**, Felsőgalla; Axoporella kolosváryi, Boschma Gánt, Bajót, Felsőgalla, Dudar. . It is very striking that we have not found any Hydrozoa yet from the Upper Eocone, in spite of the abundant Madreporaria finds. The »Millepora« of the Tertiary, as new-type Hydrozoa, associate to the coralline formations of the Madreporaria, starting a progress to finally come to its complete development in recent times : they play a very considerable role, together with the stone-coralls, in the building of the coralline barriers, shoals, and atolls, — the same in the West Indies as in the Pacific. The working out of the Oligocène coralls (G y. Hegedűs), and the Miocene coralls (G. Kopek) are under the way. The Hydrozoa of these periods fall outside the cope of this paper. E. Vadász mentions, however, a dubious »Millepora« species from the Upper Mediterranean of Budapest —Rákos. As the stratigraphie Table presents, the following species were found in the various Hungarian stages : 1 Upper Carboniferous, 3 true and 2 dubious Middle Triassic, 8 karnic of Upper Triassic, 1 true and 1 dubious Noric, 1 Liassic, 2 Upper Jurassic (malm), 2 Neocom, 1 Lower Eocene, and 6 Middle Eocene. I have yet to lay special stress upon the fact that the ?Promillepora find of the Lower Liassic at Borzavár is the most ancient Milleporid fossil up to date, and I have my doubts whether the Promillepora appearing in the Lowest Jurassic really died in the Upper Jurassic. I believe rather that it went on to develop the »Millepora« of the Tertiary,and we lack only finds to prove the direct connection of Promillepora and the Millepora of to day. Their structure, however seems to be approximately of the same construction, so much so, that the absence of connecting finds are, from the phylogenetical point of view, no more necessary. * »Millepora dalmatina shows some resemblance to certain Bryozoa« (H. Boschma Notes on Hydrocorallia). ** »the ?pecirnen of fig. 1. b. »(Reuss)« in the present paper may belong to the Bryozoa, possibly to the genus Entelophora« (H. Boschma: Notes on Hydrocorallia).
