. Bulletin. Science. 30 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. uterine organ (figs. 21, 22, par. at.) Avhicli behind is in immediate relation with the anterior end of the uterus. The para-uterine organ when fully developed extends forward to the anterior end of the segment in a slightly tortuous course. Its wall is 5 to lOfx thick, composed in large part of muscular elements, and its cavity before the eggs pass forward into it from the uterus is filled with a finely fibrous mass. The eggs are oval, with a thin outer membrane 36 to 40/x in diameter, a thicker middle shell 24 to 27/x in dia
. Bulletin. Science. 30 BULLETIN 69, UNITED STATES NATIONAL MUSEUM. uterine organ (figs. 21, 22, par. at.) Avhicli behind is in immediate relation with the anterior end of the uterus. The para-uterine organ when fully developed extends forward to the anterior end of the segment in a slightly tortuous course. Its wall is 5 to lOfx thick, composed in large part of muscular elements, and its cavity before the eggs pass forward into it from the uterus is filled with a finely fibrous mass. The eggs are oval, with a thin outer membrane 36 to 40/x in diameter, a thicker middle shell 24 to 27/x in diameter, and par. —- — >. , va&. 1 mm. Pig. 22.—Rhabdojietka xullicollis : Geavid segment. c. p., CinEus POUCH, pur. Para-uterine okgan. ut., Uterus, Vagina. a thin inner membrane closely enveloping the oncosphere, which measures 18|U, in diameter. When the eggs first enter the uterus they are surrounded by a single membrane, the others developing later. RHABDOMETRA SIMILIS, new species. Figs. 23-26. This species is based on specimens (from the collection of H. B. Ward, deposited in the U. S. National Museum Helminthological Collection, No. 7236) collected from a rain crow {Goccyzus america- nus) in Nebraska. No heads were present in this material, but 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 Smithsonian Institution; United States. Dept. of the Interior; United States National Museum. Washington, Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off
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