File:Medusae of the world (1910) (14781569862).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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, p. 6, plate 9, fig. 36. (>)Obelia commissuralis, Verrill, 1873, Report Commiss. Fish and Fisheries U. S., for 1871-72, p. 728, plate 37, fig. 281. Hydroid and young medusa.—This species is found attached to stones and seaweed nearlow-water mark. The stems of the hydroid are tree-like and are often 125 to 150 mm. inlength, although medusae are often given off from stocks of only 25 mm. in height. The stockusually consists of a long main stem that branches but little, and the side branches spring out LEPTOMEDUS.E—OBELIA. 245 nearly at right angles to main stem. These side branches give rise to numerous polypites andreproductive calycles. The longest side branches arise from about the middle regions of mainstem. The branches pursue a zigzag course, each internode trending at an angle of 450 fromprevious one. The pedicels of the polypites arise from the internodes of the branches. Theyare ringed at base and at distal end, and are usually about as long as the intervals between the
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