摘要: 一、前言自从人们用显微镜观察无脊椎动物的骨骼构造以来(Bowerbank,844;Carpenter,1845),不少作者对不同类型的显微结构致力于分类研究,旨在对它们进行更为合理的分类,同时,进行这样的结构分类也有利于观察和描述。在这些工作中,较早期的有 Frech(1890)和 Volz(1896)对刺细胞动物的研究;在软体动物研究方面,较为人们所熟悉的是,以 Bφggild(1930)和 Taylor et al.(1969)为代表的研究,他们对双壳类壳质结构类型的确定及结构名称的统一
摘要: The“Pteridophylla”have been originallydistributed into groups defined by the general ou-tline and the venation of the ultimate foliar ele-ments(=pinnules).However,since the works ofGrand’Eury,Stur,Zeiller,the frond architectureis taken more and more into account to settle therelationships between the major groups of Pterido-spermophyta (=Cycadofilicophyta),the anatomi-cal information and the knowledge on the repro-ductive organs remaining rather poor and clearlyinsufficient as compared to the amount of theknown impression-compression foliage.
