【摘要】 <正> 1958年9月,笔者随同乐森(王寻)教授在广西进行地层研究工作时,与刘时彬同志在横县六景火车站南约50米处一低山坡上,从中泥盆统郁江组上部的黄绿色页岩夹泥灰岩露头中和露头附近,采到许多保存特别完好的腕足动物化石标本。在所集的标本中有两件是相当完美的古生态标本,都是喇叭珊瑚(Aulopora)生长在尖石燕(Mucrospirifer)的壳瓣上,二更多还原

【Abstract】 During the course of stratigraphical studies in Isuangsi Province conducted by Prof. S, S. Yohin. September 1958, numerous well-preserved specimens of brachiopods were collected by the writerfrom the upper part of Ynchiang formation of middle Devonian at a hill-side about south ofLiu-ehing Station, Henghsient 1n this collection there are two excellent specimens of 11}1ucr}ospiawiferovergrown with Aulopora. The association of _Aulopora with brachiopods in the Devonian is quite a common phenomenon,which has been noted by many authorsz Here it is intended to put on :ecord two modes ofgrowth as shown by our specimens. One specimen (p1. 1, fig, la-c) shows that Aulopora started i s growth on the middle partof thebrachial valve, lengthened its colony toward the anterior commissure and stopped there withoutcrossing the commissure. On the other specimen (p1. 1, fig. 2a-c), Aulopo,grew also on thebrachial valve, but it is limited at first to the anterior part, then crossed the anterior commissureand finally covered the anterior portion of the ventral median sulcus. In both cases all the corallitesof Aulopora have their apertures facing the anterior portion of the shell. The number of corallitesof the first specimen grew with their lateral parts attached to the shell and formed the chain-likearrangement at the anterior commissure, while those of the second specimen were attached to theshell by their distal parts and assumed a fasciculate growth. In the first case Aulopora grew on Mucrospirifer apparently when the latter was still alive;and it was benefitted by food-carrying currents that flowed into the shell. 1n the second case,however, Aulopora overgrowing the anterior commissure of the brachiopod was surely not benefittedby the current at least during the tatter stage of development of the colony, which outlived theshell as the shell had been damaged at the anterior part of the fold. From what mentioned above it can be seen that different modes of association of Aulopora wish1l7ucrospinfer have resulted in different shape of the shell and correct analysis of the phenomenonis essential in connection with specific determination of the Mucrosprifer in case such associationoccurs.更多还原