Synopsis
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ...The amnion is attached about l'/2 millim. outside the abdominal insertion of the umbilical cord. From the cephalic margin of the navel, or in other words, the margin nearest the chest region, projects a very narrow cylindrical process, about 2 millim. in length, with a slightly club-shaped, expanded free end (fig. 12, v. u.). This I take to be the vesicula umbilicalis, which is connected with the gut by a short ductus omphalomesentericus. General remarks. This smallest Phocsena embryo, which may be said to measure about 14 millim. when the distances between the fœtal flexures are added together, presents all the characters in their general form. and as we are accustomed to find them in other mammal embryos in a corresponding stage of developement. One peculiarity which may be noted is that it is very small and slender, a human embryo of about the same degree of developement being both longer and considerably thicker. The size of the head, moreover, seems to be small in proportion to the body, while the tail is unusually long. As already indicated, the rudiments of the hind-extremities are very small in proportion to the fore-limbs, when comp.-ired with the embryos of four-footed Mammals; and though the external form of the limbs in this Phocsena fœtus does not, on the whole, seem to dift'er from the ordinary embryonal limb form, I consider the paddle-like shape of the hindextremities to be somewhat characteristic. The transversally situated olfactory depression also seems to me to be characteristic, and perhaps already denotes an Odontocete character. At any rate, the shape of the nose here differs distinctly from the shape of that organ in a somewhat larger fœtus of Phoca grönlandica (17 millim. measured from the flexure of the head to ...
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