河南济源晚石炭世太原组的一种复体四射珊瑚

Ａｃｒｏｃｙａｔｈｕｓ是一类块状体或丛状体的四射珊瑚，在北美分布于下石炭统，我国见于上石炭统，但丛状体的在我国系首次发现。在连续切片上，可见两个生长阶段，其繁殖方式有侧芽繁殖和边缘泡沫板内繁殖，系统分类上另置独立的科级分类。根据形态分析，该珊瑚栖息在动水，能量略高及食料丰富的浅水环境。当前标本为一新种：Ａ．ｊｉｙｕａｎｅｎｓｉｓｓｐ．ｎｏｖ．。

A PHACELOID COLONIAL RUGOSE CORAL FROM LATE CARBONIFEROUS TAIYUAN FORMATION OF HENAN

The genus Ccrocyathus discovered in the Taiyuan Formation (Late Carboniferous) ofJiyuan,Henan,China,is a large phaceloid colonial corallum measuring 80cm in height and40 x 25cm in diameter, in coexistence with the fusulinids Pseudofusulina, Quasifusulinaand Rugosofusulina. In this genus,one phaceloid colonial species,C. proll'ferus (Hall) (inSando, 1983), is distributed in the Lower Carboniferous (Visean) of USA. The presentspecimen was cut in 22 transverse sections and 14 longitutinal sections. It is found that thecorallites grew densely in the lower part (approximately in the early and middle stages),with their skeletons thickened on sides. Based on the development of sepia and axis, 2stages of 'he corallites may be recognized in descending order as follows: