. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. the Crlnoidea, Cjstidca and Blastoidea. 253 imbedded in and form a portion of the general covering of the body, or lie npon the surface, or be borne upon free-moving arms. In genera belonging to the same family these relations are constant or nearly so, -but are found to be extremely vari- able when ditferent orders or remotely allied families are compared. While preparing my Decade No. 3, I investigated this sub- ject, and satisiied myself that in at least a large proportion
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. the Crlnoidea, Cjstidca and Blastoidea. 253 imbedded in and form a portion of the general covering of the body, or lie npon the surface, or be borne upon free-moving arms. In genera belonging to the same family these relations are constant or nearly so, -but are found to be extremely vari- able when ditferent orders or remotely allied families are compared. While preparing my Decade No. 3, I investigated this sub- ject, and satisiied myself that in at least a large proportion of the palaeozoic Crinoids the mouth was disconnected altogether from the radial system. A great many species might be re- ferred to in which we can see both the centre from which the ambulacra proceed, and the mouth, and at the same time see that they are not in the same i)lace. A long train of reason- ing is not necessary, only simple inspection. It will be quite sufficient to notice a few of these species to prove that the rule laid down by Prof. Wyville Thomson is not a general rule. Fiff. 1. Fig. 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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