. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 240 M. C. Mereschkowsky on the Hydroida. and which may be generalized into a single idea, a single law of metamerism {Metamerengesetz) or oi articulation. This law may be formulated as follows :—The Hydroid may he composed of two or several metameres^ similar or not : each metamere in its turn is composed of several antimeres. Fig. 1 shows diagrammatically a Hydroid belonging to what I call the articulate type; it will be seen that it con- sists of three very distinct metamere
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. 240 M. C. Mereschkowsky on the Hydroida. and which may be generalized into a single idea, a single law of metamerism {Metamerengesetz) or oi articulation. This law may be formulated as follows :—The Hydroid may he composed of two or several metameres^ similar or not : each metamere in its turn is composed of several antimeres. Fig. 1 shows diagrammatically a Hydroid belonging to what I call the articulate type; it will be seen that it con- sists of three very distinct metameres, each of which is in its turn composed of four antimeres*. This law governs a considerable number of forms among the Hydromedusse ; we may recognize it in the species be- longing to various genera—for example, in Stauridium^ Coryne, Fig. 2. Fig. Syncoryne^ Millepora^ Cladonema, Tuhularia, Cordylophora Gemmariaj &c.; but all the cases in which we remark the arti- culate type among the Hydromedus^e belong exclusively to the order of naked Hydroids (Athecata). There is not a single Hydroid belonging to the order Thecaphora which * According to M. E. Hackel we should have to call such a type ^[forma staurasfoma cfiplopola articulafa,'". Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original London, Taylor and Francis, Ltd
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