Ayer's Development of Oecanthus Niveus And Its Parasite Teleas
Ayer's Development of Oecanthus Niveus And Its Parasite Teleas
Alpheus Spring Packard
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Mark, at Cam- bridge, Mass. It received the Walker prize of the Boston Society of Natural History, in whose memoirs it appears, under date of January, 1 884, forming a brochure of 56 pages, with eight plates and woodcuts in the text. Mr. Ayers endeavors to establish the fol- lowing points in the embryology of CEcanthus : 1. The origin of the ovum in a germarium rather than from an ovarian epithelium. 2. The process of yolk formation by cell-degeneration instead of secretion. 3. The occurrence o...f a primitive segmentation of the embryo before the appearance of the permanent segments. 4. The existence of a pair of appendages (some of them rudi- mentary [deciduous]) on each of the seventeen segments of the body. 5. The origin of the dorsal vessel as a paired organ, the lateral halves of which fuse and give rise to a median tube in the same Digitized by VjOOQIC Sit Gemrvd NHes. \)Axf^ manner as in some of the worms, and the origin of the blood corpuscles as nucleoh' of endodermic cells. 6.
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