File:Medusae of the world (1910) (14595303379).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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ons are of ectodermal origin. A conical excretion pore is commonly found on theinner (subumbrella) side of each tentacle-bulb adjacent to the ring-canal. Ocelli are unknown. Medusas of /Equorea commonly display great individual color variability, ranging throughdeep-blue, violet, milky, or transparent, and in their ontogeny they are also quite variable Plate 42. Fig. 1. JEquorea forskalea, natural size. Tortugas, Florida, May 8, 1906. Fig. 2. JEquorea forskalea. An enlarged view of the bell-margin, showingradial-canals, female gonads, tentacles, lithocysts, and excretorypores. Fig. 3. JEquorea forskalea. Two of the marginal lithocysts. Fig. 4. JEquorea forskalea. Portion of the bell-margin seen from the exum-brella side, showing a radial-canal, re; the ring-canal, r; anexcretory pore, ex p; and the velum, v. Figs. 5 and 6. JEquorea (variety of forskaleaV). Figure 6, part of the bell-margin of the medusa shown in figure 5. Key West, Florida,June 7, 1897. Drawn from life, by the author.
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LEPTOMEDUS^E—^EQUOREA. 325 from the meristic standpoint, some individuals having the tentacles more and others lessnumerous than the radial-canals. Moreover, the shape of the stomach changes from a simple4-lipped manubrium to one having 50 or 100 lips, widely gaping, and with curtain-like, foldedmargins Gonads develop at various times upon the radial-canals. Indeed the greatestconfusion has been introduced into the synonymy through the description of developmentalstages of /Equorea under various generic names.For example, Haeckel distinguishes: (1) Rhegmatoies, with simple funnel-shaped stomach and closed, narrow-necked mouth. (2) Polycanna, with elongate stomach with large throat-tube and closed mouth with folded lips.(7) /Equorea, with wide, short stomach and widely gaping mouth with simple lips. (4) Mesonema, with wide, short stomach and widely gaping mouth with complexly folded lips. Claus 1881, 1883, shows that the common /Equorea forskalea of the Atlantic and Mediter-ranean pa

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