Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 5. (Budapest 1954)
Kolosváry, G.: On the known fossil Hydrozoa of Hungary
developed within. (Ancient type.) Astrorhizae well developed. Families.: Actinostromidae Nicholson; Burgundidae Dehorne ; Siphonostromidae Steinmann; Disjectophoridae Tornquist, and Milleporelloidae Yabe et Sugiyama. «L'évolution des structures squelettiques fondamentales est surtout remarquable dans la famille des Stromatoporidae qui représente le tronc du groupe des Stromatoporîdes. La structure trabéculaire des éléments squelettiques passse progressivement à une structure tubulaire tandis que les astrorhizes abandonnent leur développement horizontal pour un développement vertical. Les étapes de cette différenciation, marquées par les Stomatoporidae, les Milleporellidae et les Milleporidiidae . . .» (M. Lecorripte, p. 34). Palaeozoic Stromatoporidae are almost completely unknown in Hungary. So we will not trouble ourselves with a more detailed exposition. We have no Silurian formations, the Devonian beds at the western border of the country did not yield any Hydrozoa fossils yet. Fossil Hydrozoa were found in our country only from the Upper Carboniferous onwards. Spongiomorphida. — Five orders belong here. Spongiomorphidea are characterized by lacking pseudocalices, but display dissepimental vesicles, similar to the astrorhizae. Their horizontal laminae are well developed. Stromatomorphae are characterized by »epaississements annulaires qui se juxtaposent ou se raccordent« (A 11 о i t e a u). Heptastylis has not pseudocalix as yet, % Heptastylopsis and Cylicopsis have. Genera: Spongiomorpha Frech, 1890; Triassic; Stromatomorpha Frech 1890, Triassic ; Heptastylis Frech 1890, Triassic — Jurassic ; Heptastylopsis Frech 1890, Triassic — Jurassic (synonym : Spongiomorpha sp.) ; Cylicopsis la Maître 1935, Triassic — Jurassic. The Distribution of our Hydrozoas* Upper Carboniferous A Hydrozoa find became known from the black marl slate of Mt. Nagykőbánya in the Mts. Szendrő. In my paper on the Permo-Carboniferous corals, I have erroneously mentioned it in the order Hydroid,af\ have to amend this, since the found Circopora sp. is a genus of the order Stromatoporoidea. Its specific state cannot be surely determined. The genus Circopora is known also from the Upper Triassic of Indonesia, as mentioned also by G e r t h. Generally, it is the characteristical genus of the Carboniferous and the Permian, described by Waagen et Wetzel. The external, striated surface of the structure is undulating, with several horizontal structure lamellae under the cortex. Triassic Our Triassic Hydrozoa-mater'ml originates from several localities. Its majority was yielded by the Conchodonous raibli-marl of the Jeruzsálemhegy, in Com. Veszprém. Here, too, Balatonia kochi Vinassa was found, which came forth later also from the raibli beds near the village Vallus in Mts. Keszthely, and the limestone of Mt. Sándorhegy. Further, Jeruzsálemhegy produced also * Material collected by К. В a 1 о g h, Ä. Franzenau, J. F ü 1 ö p, G. KolosV á r y, J. N о s z к у, s. and jr., Z. Schréter, R. S t r e d a, F. Szentes, E. S z ő t s, and I. Veréb.
