. The biology of the cell surface. Cytology. THE ECTOPLASM plasmic structure of the Rhynchelmis egg is similar to that recorded for the Nereis-egg by several workers beginning with Goette^ and this in turn recalls Spengel's older descrip- tion for the egg of Bonellia.^ Also the Chaetopterus-egg has an interesting ectoplasm,^so too that of Thalassema^ (Fig. 12). Among the great group of soft- bodied animals, the mollusks, including the clams, snails and ink or cuttle fishes, the following produce eggs in which the ecto- riG. 12.—Ectoplasm on the plasm has been observed to be living egg of Thdla
. The biology of the cell surface. Cytology. THE ECTOPLASM plasmic structure of the Rhynchelmis egg is similar to that recorded for the Nereis-egg by several workers beginning with Goette^ and this in turn recalls Spengel's older descrip- tion for the egg of Bonellia.^ Also the Chaetopterus-egg has an interesting ectoplasm,^so too that of Thalassema^ (Fig. 12). Among the great group of soft- bodied animals, the mollusks, including the clams, snails and ink or cuttle fishes, the following produce eggs in which the ecto- riG. 12.—Ectoplasm on the plasm has been observed to be living egg of Thdlassema mellita marked off from the endoplasm: (after Lefevre). Mactra" and Mytilus^ (clams), various species of Chiton^'. 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 Just, Ernest Everett, 1883-1941. Philadelphia, P. Blakiston's son & co. , inc
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