. Bulletin - United States National Museum. Science. 120 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. The oral and atrial muscles of Thalia longicauda have not been studied, nor have the neural glands and the outgrowths from the ganglion. The eye of the aggregated form has not been observed. Dober (1912) gives a figure of the eye of the solitary form showing little detail, but apparently indicating that the pigment is in three divisions corresponding to the enlargements of the eye in the ordi- nary Thalia democratica. The Thalias are a sharply demarcated subgenus. They grade into the other sub
. Bulletin - United States National Museum. Science. 120 BULLETIN 100, UNITED STATES NATIONAL MUSEUM. The oral and atrial muscles of Thalia longicauda have not been studied, nor have the neural glands and the outgrowths from the ganglion. The eye of the aggregated form has not been observed. Dober (1912) gives a figure of the eye of the solitary form showing little detail, but apparently indicating that the pigment is in three divisions corresponding to the enlargements of the eye in the ordi- nary Thalia democratica. The Thalias are a sharply demarcated subgenus. They grade into the other subgenera less even than do the Cyclosalpas. This is shown especially in the character of the eyes and the absence of neural. 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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