File:Medusae of the world (1910) (14781638682).jpg

Identifier: medusaeofworld02mayo (find matches)
Title: Medusae of the world
Year: 1910 (1910s)
Authors: Mayor, Alfred Goldsborough, 1868-1922 Mayer, Alfred Goldsborough, 1868-1922
Subjects: Jellyfishes Cnidaria
Publisher: Washington, D.C., Carnegie institution of Washington
Contributing Library: MBLWHOI Library
Digitizing Sponsor: MBLWHOI Library

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linear groups, in no sensecomparable with the tentacle-clusters of Gossea. He concludes, therefore, that this medusais actually G. suvaensis. I present Brownes clear description herewith, for this was inproof before the appearance of Bigelows excellent paper upon the medusae ot the easterntropical Pacific, and it will serve as a means of reference to the medusa. Bell hemispherical, 6 mm. wide, with moderately thick walls. About 70 tentacles, allwith adhesive pads on their exumbrella sides near middle of lengths where the tentaclesare contracted. These tentacles are about equally spaced around the margin, but are arrangedin 16 groups in accordance with size. The 16 radial, adradial, and interradial tentacles arelong and the remainder are smaller, those nearer the long tentacles being longer than thetentacles farther away. The radial and interradial groups contain each about 5 tentacles,and the adradial clusters only about 4 tentacles. This tendency toward grouping exhibited by108. 99-
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Fig. 198.—Gonionemus depressus, after Goto, in Mark Anniversary Volume.Fig. 199.—Gonionemus suvaensis, after Bigelow, in Bull. Museum Comp. Zool. at Harvard College.Fig. 200.—Bell-margin of Gonionemus suvaensis, after Bigelow, in Bull. Museum Comp. Zool. at Harvard College. the tentacles recalls the condition seen in Gossea, but is not so well marked. The tentacles allproject from the exumbrella sides of the margin, their entodermal cores piercing the gallert.The tentacles are profusely ringed with nematocysts. There is a globular marginal bulb atthe base of each tentacle. There are 16 lithocysts on the subumbrella side of the margin,between the 16 groups of tentacles, adjacent to the circular canal. Velum fairly broad. 4broad radial-canals. Stomach cruciform, mounted upon a short, broad, conical peduncle.4 short, simple lips. The gonads are developed upon the distal ends of the radial-canals verynear the circular canal. They are small, deeply folded and lobed, and extend latera

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