. Bulletin - United States National Museum. Science. a,o. Fig. 25.—Ritteria retracta, solitary form: A, dorsal view; B, view from the left side. DIAMETERS. FROM RlTTER (1906, b). Xl{ angles of the mouth, and a second, very broad sphincter in the upper Up, of whose connections ventrally I am not quite sure from Ritter's figure, though it seems to connect with the second and third sphincters of the lower lip. Dorsal, horizontal muscle bands lie, one on each side, between this broad sphincter and the upper ends of the inter- mediate muscle, but are not connected with the latter. Ritter's do
. Bulletin - United States National Museum. Science. a,o. Fig. 25.—Ritteria retracta, solitary form: A, dorsal view; B, view from the left side. DIAMETERS. FROM RlTTER (1906, b). Xl{ angles of the mouth, and a second, very broad sphincter in the upper Up, of whose connections ventrally I am not quite sure from Ritter's figure, though it seems to connect with the second and third sphincters of the lower lip. Dorsal, horizontal muscle bands lie, one on each side, between this broad sphincter and the upper ends of the inter- mediate muscle, but are not connected with the latter. Ritter's dorsal and side views disagree as to the union of this horizontal band with the sphincter The atrial muscles, likewise, are distinctly of tho Cyclosalpa type, most resembling those of the solitary C. virgula in the character, position, and connections of both retractor and sphinc- ters, but there is resemblance also to the aggregated C. virgula in the fact that all the distal atrial sphincters are connected with the 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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