This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1896. Not illustrated. Excerpt: ... some future theories of development, find their proper place and partial explanation. It seemed inadvisable to add further to this paper by detailed reference to the voluminous literature bearing only indirectly on the facts here set forth. So little is known about variations in arthropod embryos, and especially arachnids, and the facts we present are so different in character from those already known, that no injustice will be done previous workers along similar lines by not referring in detail to their publications. The only reference to an abnormality in Limulus that I have been able to find is in an article on "Diploteratology, An Essay on Compound Human Monsters," by Geo. J. Fisher, Albany, 1868. A good figure is there given of an adult (?) animal with a double caudal spine and a symmetrically forked abdomen. description of the different classes of variation. I. Invagination Of Appendages. This remarkable modification is of comparatively common occurrence in forms which are in other respects more or less abnormaI. It is confined, so far as I have observed, to the thoracic appendages, and most commonly affects the middle ones of the series. It may begin after the appendage is fully formed as a minute, slit-like depression at its distal end, Figs. 10, ii, th.ap., th. aft.1. The slit is always transverse to the long axis of the body, and appears in the stained specimens as a fine line in the middle of a clear band devoid of nuclei. When the invagination is complete, the whole appendage is carried inward, so that in its place is an opening leading into a de...
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