. Outlines of natural theology for the use of the Canadian student [microform] : selected and arranged from the most authentic sources. Natural history; Natural theology; Sciences naturelles; Théologie naturelle. > \ 402 ledge in embryology and palaeontology justifies now such a ; In examining the agreement between this succession, and the phases of the em- bryonic growth of living animals, we may therefore take for granted, that the order of succession of their fossil representatives is sufficiently present to the mind, to afford a satisfactory basis of comparison. No class
. Outlines of natural theology for the use of the Canadian student [microform] : selected and arranged from the most authentic sources. Natural history; Natural theology; Sciences naturelles; Théologie naturelle. > \ 402 ledge in embryology and palaeontology justifies now such a ; In examining the agreement between this succession, and the phases of the em- bryonic growth of living animals, we may therefore take for granted, that the order of succession of their fossil representatives is sufficiently present to the mind, to afford a satisfactory basis of comparison. No class affords, as yet, a more complete and more beautiful evidence of the correspondence of their embryonic changes, with the successive appearance of their representatives in past ages, than the echin- oderms. Prior to the publications of J. Muller, the metamorphosis of the European comatula alon^ was known. This had already shewn that the early stages of growth of the echinoderm exemplify the pedunculated crinoids of past ages. I have myself seen further, that the successive stages of the em- bryonic growth of comatula, typify, as it were, the principal forms of crinoids which characterise the successive geological formations ; first it recalls the cistoidsofthe palseozoic rocks, which are represented in its simple spheroidal head: next, the few-plated platycrinoids of the carboniferous period ; next, the pentacrinoids, of the lias and oolite, with their hosts of cirrtic, and, finally, when freed from its stem, it stands as the highest crinoid, as the prominent type of the family in the present period. The investiga- tions of Muller upon the larva of all the families of asteroids and echinoids, enable us to extend these nece; the such. 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 Bovell, James, 1817-1880. [
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