Boros István (szerk.): A Magyar Természettudományi Múzeum évkönyve 5. (Budapest 1954)

Kolosváry, G.: On the known fossil Hydrozoa of Hungary

Stromactinia triasiana V i n a s s a, which is probably an Ellipsactinia variant with a slight zoid tube. — Stromatomorpha stylifera Freeh was collected in the Jeruzsálemhegy beds, too ; then, from the raibli marl, near Csővár, Heptastylis sp. and Heptastylopsis ramosa Freeh were found in the raibli marl, of Mt. Várhegy, near Csővár. The genus Heptastylis is characterized by the radial development of the spines in the tubes (6—7 on one side, seventh building usually a pseudocolumella). The colony itself is ramose, the trabecular grating in the branches are composed of horizontal and vertical elements. The horizontal elements may fuse together, besides being very irregular. The trabeculums are more insignificant in the radial structure. The following Hydrozoa were yet found in the Triassic of Hungary : a Hydrozoa not to be specifically determined from theKarnic horizont of the hills in Buda, in the Farkasvölgy (possibly a Heterastridium); a Milleporidiumlike fossil in the limestone of the Noric horizont of the Remetehegy (Budapest), a faultily conserved Hydrozoa, similar to Balatonia, became known from the Ladin horizont of the Mts. Bükk, near Répáshuta ; a dubious Spongiomorpha cf. aff. gibbosa Freeh, from the Ladin horizont near Lillafüred ; and a Milleporidium sp. from Répáshuta, also from the Ladin. Heterastridiums spread all over the world in the Triassic. They were in abundance in the Karnic horizont of the Jeruzsálemhegy, in Com. Veszprém. E. К u t a s s y identified them. These finds were considered formerly by L а с z к ó and L о с z y as simple concretions. Not even. Vinassa de R e g n y mentioned them. These concretions are, however, the colonies of the Hydrozoa Heterastridium conglobatum Reuss. It is widely spread in the whole Triassic, North of the Balaton, near Arács, Csopak, and Veszprém. К u t a s s y had shown it from the Noric horizont of the Remetehegy (Budapest). He enumerates yet Heterastridium conglobatum Reuss var. verrucosa Duncan from here. It is known globally from the Alps, the Balkan, from the Upper Triassic of the Malayan Archipelago, from the Mts. Moma Codru in Transsylvania, and also the Triassic of Alaska. According to G e r t h, its is known also from the Upper Triassic of Indonesia. Jurassic Only Hydroids are then found in our Jurassic. Several finds of the family Milleporidiidae, with a structure corresponding to Hydrocorallids, were collected from a 390 m. altitude on the Páskomtető, near Borzavár in the Mts. Bakony. From the red limestone of the Lower Liassic, first excavated by me! The age of this limestone, according to the oral communication of G. V i g h, and based on Brachiopods and Ammonites, is Lower Liassic. These, rather broken, finds resemble fractured branches of a Promillepora, and they are insufficient for specific determination. The gastropores are present in large numbers, while the smaller dactylopores are fewer. Another, specifically indeterminable but typical, Milleporidium came to light from the diphiatic horizont of the Upper Jurassic limestone quarry, situated near the highway between Zirc and Borzavár. Milleporidium remesi Steinmann was found also here. This can be met with in the titonic limestone quarry of the Pintérhegy, near Zirz, too. The remains of a smashed Milleporidium appeared in a quarry at Milestone 3, along the Zirc—Borzavár road. As is to be seen, the Hungarian Jurassic exhibits a relatively copious Mille por idium-materlal, corresponding to the Upper Jurassic domination of this genus.