File:Medusae of the world (1910) (14778851601).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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IA. 373 arranged. 3 long, filiform tentacles, which lack suckers, arise from the upper apex of the tri-angular thickening, and there are also a large and variable number of short, sucker-bearingtentacles, which arise from the basal parts of the triangular thickening. The long filiform ten-tacles taper gradually from base to tip, but the short sucker-bearing tentacles widen outwardly,and usually end in a pad-like sucker, though this is sometimes absent. There are probably 48long, isolated filiform, suckerless tentacles, alternating with the 48 clusters of tentacles. Alto-gether there are more than 1,000 tentacles. The sucking cups and short-stalked tentaclesof Haeckel, 1881, are only broken tentacles or basal remnants of tentacles, for they appear tobe quite brittle, as is commonly the case in Trachymedusae. There are 16 marginal sensory-clubs, 2 in each octant, arising from the inner side of thebell-margin immediately under a group of sucker-bearing tentacles. The sensory-club is very
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Fig. 212.—Pt\chogaslria polaris, after Browne, in Bergens Museums Aarbog, 1903.Above: Diagrammatic side view. Below: Diagrammatic cross-section of bell. small, mounted upon a short stalk, and contains a single concretion. There are 8 radial-canals.These are not very wide upon leaving the stomach, but they widen outwardly and become verybroad and flat where they join the ring-canal. The ring-canal is also very broad and gives off8 broad, flat, centripetal vessels which alternate with the radial-canals and taper to fine pointsnear the edge of the stomach. There is a thick layer of circular muscle fibers over the sub-umbrella and the canal-system lies under this muscular system. Stomach about half as long as depth of bell-cavity, vase-shaped, 8-rayed above; each ofthe 8 stomach pouches is bound to the subumbrella by a mesentery along the line of the cor-responding radial-canal. Mouth-tube quadrate, with 4 lips; 4 of the stomach-lobes are in theradii of the lips and 4 are interradial. T

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