File:Medusae of the world (1910) (14595347450).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

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
either marginal tentacles nor marginalsense-organs of any sort. In all respects, excepting its apical sense-organ, peculiar structure of the= tentacles and in h3S Tnfg^d^r^tlThave not been observed and the specimens found by Dawydoff ^l^CSES- Hyir^na and C^Wappear tc.me£ bemere^lelisms none of which indicate a genetic relat.onsh.p With Ctenophorae The on y ex lus.velyC enophore-like character of HyJroctena is the gelaunous nature of the axial ores ot ,tsTentacles, which differ from those of other Narcomedus* in being h.ghly contractile. Hydroctena salenskii Dawydoff.HyJrJ£%Wo,m*cx, ,9o5! Verhandl. Deutsch. Zool. Gesell., ,5 Jahresvers., p. ,,5. Immature medusa.-BeM pyriform, + mm. high. No tentacles or sense-organs at bellmargm but i-tead 2 long, diametrically opposed tentacles anse from deep sockets >n theSef of bell and project from the exumbrella nearer to apex than to bell-marg n. The tenIZs ar!J lPe attack lateral filaments, highly contractile, and can be partially withdrawn
Text Appearing After Image:
F,c. joj.-ff,*.^ *~*H, -Pied from Dawydoff, in Mte. Acad. Sci. St. Petersburg. A, side view of medusa;303 n.v b^ saggital section; C, v.ew of apical sense-organ. within their pit-like sheaths. Their ectoderm contains nematocysts similar to those of Hydro-m dusi buMheir axial cores do not cons.st of entodermal cells but of the gelatinous; substancermesoeTcea) of the bell as in Ctenophor*. This gelatinous substance contain, the muscle-ls whTch enable the tentacles to contract. Surface of exumbrella smooth and devoid ofcuia Ix epting at aboral pole where we find a remarkable sense-organ consisting of a deepc atedI cS-like pit, the exterior opening of which is surrounded by a thick, pigmentedne of ectode mal Cell bearing long, hair-like bristles. The deep-lying end of the pit containslgsphe ica lnhocysts, each mounted on a slender stalk. These lithocysts are diametricallyopposed I ino/clear from Dawydoffs description whether they are in the tentaculardfame er o in a plane 9o° from the la

Note About Images