. Carnegie Institution of Washington publication. --o. FIG. 7.—Young external sac of Thompsonia; whole preparation to show general appearance of mantle and ovary. X60. FIG. g.—Portion of transverse section of a more advanced external sac. X240. in., mantle; ch. ex., external layer of chitin; ch. in., internal layer; vac., vacuolated external layer of visceral mass; o., ovary, with ov., develop- ing eggs, and , interstitial cells. Coutiere states that the external sacs of Thylacoplethus show the following typical Rhizocephalan structures: "Tin manteau a double paroi, dans lequel est su
. Carnegie Institution of Washington publication. --o. FIG. 7.—Young external sac of Thompsonia; whole preparation to show general appearance of mantle and ovary. X60. FIG. g.—Portion of transverse section of a more advanced external sac. X240. in., mantle; ch. ex., external layer of chitin; ch. in., internal layer; vac., vacuolated external layer of visceral mass; o., ovary, with ov., develop- ing eggs, and , interstitial cells. Coutiere states that the external sacs of Thylacoplethus show the following typical Rhizocephalan structures: "Tin manteau a double paroi, dans lequel est suspendue une masse viscerate et qui porte une ouverture ; With this general summary I am in agreement. Hafele, on the other hand, does not appear to recognise any homology between the external layer of tissue (aussere Gewebeschicht) and the mantle of other Rhizocephala, or between the internal body (internale Gewebeschicht and Ovarium) and the visceral mass. There is, however,. 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 Carnegie Institution of Washington. Washington, Carnegie Institution of Washington
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