File:Medusae of the world (1910) (14595347980).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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enus Cunoctantha and describes C. discoidalis as the first species.This appears, however, to be a young stage of some Cunina, and McCradys previouslydescribed C. octonaria should serve as the type of the genus. Plate 55. Fig. 1. Cunoctantha octonaria, mature male. Charleston Harbor, SouthCarolina, September 7, 1897. Lettering as in figure 2. Fig. 1. Cunoctantha octonaria. A sensory-club of the medusa shown infigure I. Fig. 2. Cunoctantha octonaria, young medusa removed from the manubriumof Turritopsis nutricula McCrady, to which it was clinging. Inboth figures I and 2, n n indicates the marginal nerve cord; o,otoporpa; v, annular part of the velum; v , web-like part of thevelum between the lappets. Charleston Harbor, South Carolina,September 10, 1897. Fig. 3. JEginura incisa. Tortugas, Florida, June 30, 1899. Fig. 4. Solmundella mediterranea, female. An oral view of this same medusais shown in figure 1, plate 54. Tortugas, Florida, May 27, 1906 Drawn from life, by the author. PLATE 55
Text Appearing After Image:
NARCOMEDUSiE—CUNOCTANTHA. 461 GENERIC CHARACTERS. /Eginidae with 8 tentacles and 8 peronial furrows, alternating with 8 marginal lappets.With 8 peripheral, uncleft outpocketings of the central stomach in the radii of the 8 tentacles.A peripheral, peronial canal-system may or may not be present. Otoporpae are found in allknown forms of Cunoctantha. We should not attempt to separate families of Narcomedusae upon such a variable char-acter as that of the presence or absence of the very degenerate peripheral canal-system. Alsothe presence or absence of sensory tracts above the marginal clubs is apparently no moreimportant than the presence or absence of rows of nematocyst-cells over the exumbrella inmany Anthomedusae. It is safer to regard such slight differences as of specific, not of genericvalue. Moreover, the otoporpae and peripheral canals may vary independently, and to considerboth of them as of generic value would introduce a complexity into the classification whichwould cause cl

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