File:Bulletin - United States National Museum (1928) (20320923468).jpg

Title: Bulletin - United States National Museum
Identifier: bulletinunitedst10011928unit (find matches)
Year: 1877 (1870s)
Authors: United States National Museum; Smithsonian Institution; United States. Dept. of the Interior
Subjects: Science
Publisher: Washington : Smithsonian Institution Press, (etc. ); for sale by the Supt. of Docs. , U. S. Govt Print. Off.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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SCYPHOMEDUSAE COLLECTED BY STEAMER ALBATROSS. 223 very small appendages among the mouths of the mouth-arms. The mouth-arms are strongly compressed laterally. A single duct extends down each mouth-arm and gives rise to four terminal branches, two to the lateral wings and two to the triangular extremity of the arm. There are eight wide rhopalar radial canals, of which the four perradial ones rise directly from the stomach; but each of the 4 inter- radial arise from the confluence of a Y-shaped fork. Seven to nine narrow radial vessels arise in each inter rhopalar octant and extend outward anastomosing profusely with each other and with the eight rhopalar canals. There is no definite ring-canal. A wide, entire, annulus of circular muscles is found in the sub- umbrella, but there are no radial muscle strands. This muscular zone â v-Q^lCn-
Text Appearing After Image:
Fig. 21.âVeesura maasi from Mantacao Island, west coast of Bohol. A, Oral VIEW. B, A CLUB FROM THE MOUTH-ARMS, MUCH MAGNIFIED. C, A MOUTH-ARM SEEN FROM THE OUTER (ABAXIAL) SIDE. D, EXUMBRELLA VIEW OF ONE OF THE MARGINAL SENSE ORGANS. is wider in the interradii than in the perradii, and is somewhat thinned but still unbroken in the eight rhopalar radii. In formalin the rhopalar canals, and all vessels near the stomach, are bluish purple. The mouth-frills are brownish to brownish purple. The bell is milky and the gonads dull brownish yellow. Genus LOBONEMA Mayer, 1910; sensu Light, 1914. Lobonema Mayeb, 1910, Medusae of the World, vol. 3. p. 638.âLight. 1914, Philippine Journ. of Science, vol. 9, p. 216. Generic Characters.âRhizostomata triptera in which the marginal lappets are greatly extended, tapering to pointed ends. These lappets are noncontractile and lack muscles. Mouth-arms with numerous filaments. Mouth-arm membranes perforated by windowlike open- ings. Eight to sixteen rhopalia and twice as many radial-canals, and a ring-canal which gives off anastomosing vessels on both its inner and outer sides. The inner network does not connect with the stom-

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