Further observations on the unity of structure in the animal kingdom, and on congenital anomalies, including 'hermaphrodites' : with some remarks on embryology, as facilitating animal nomenclature, classification, and the study of comparative anatomy / by Martin Barry.

  • Martin Barry
Date:
[1837]
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Licence: Public Domain Mark

Credit: Further observations on the unity of structure in the animal kingdom, and on congenital anomalies, including 'hermaphrodites' : with some remarks on embryology, as facilitating animal nomenclature, classification, and the study of comparative anatomy / by Martin Barry. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    The curves may now illustrate the development of the radi- cal portion of either an extremity, viz. of the scapula and cla- vicle, on the ore hand, and of the outer portion of the os inno- minatum,* on the other, or that part of the base of the cranium, which,—formed by one of those osseous arcs, and having coa- lesced with the cranial vertebra;,—serves to articulate the upper jaw.f Again, if A represent a point near the middle of each arc, the curves shew the development of a process originating there, now into an arm or leg, and now into an upper jaw.J The diagram (Fig. 11) may be applied also in a comparison of various parts arising out of the mucus (Plate I. Figs. 3 and 4 ***, Fig. 5, l, Fig. 6 and 7, f), in close union with the vascu- lar (Plate I. Figs. 4 and 5, h, i, k, Figs. 6 and 7, e) lamina of the germinal membrane of Man. These united laminae having become a tube, there occurs in certain sections diminished, in certain others increased Fig. u. growth, by which organs are originated, presenting the appearance of processes, in the one case towards (Fig. 15), in the other from (Fig. 16) the axis of the tube; these processes having, as their base, either the whole or a part only, of its circumference. Some of these processes are in no small degree analogous to each other, and, as is the case with all other organs of a series,— with all animals indeed,—the more alike, the nearer to the period of their origin we view them. Thus the lungs have been compared to the urinary organs, Fig. 16. * The inner portion of this bone being probably, as Von Bar supposes, analogous to ribs, derived from the under tube, and coalescing with a section of the outer, to constitute the pelvis. + Von Bar. X Or in some of the Vertebrata, into a wing, a fin, &c. In Fig. 10, p. 16 of the former memoir, (p. 131 of the Journal), there was given an ideal transverse section, shewing the structures formed out of the serous lamina of the germinal membrane in the Arthrozoa. There is a re- markable tendency to repetition in the segments of their dermo-skeleton, in- cluding that portion of the latter that enters into the formation of the head ; and in certain of them the legs insensibly pass into maxillae. No doubt the same tendency to repetition is universal in the animal kingdom.
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