. Elementary text-book of zoology. Zoology. FIG. 183.—Sense organ on the nerve-ring and circular vessel of Octorchia (after O. and R. Hertwig). Rb, Sense organ ; O, O', two otoliths; Hh, audi- tory cilia ; Hz, auditory cells ; Nv, upper nerve-ring ; Kr/, cir- cular vessel. (Type of the audi- tory organ of the Vesiculalu.) The audi- tory organs of the Tra- chymedusce are placed above the velum, and are in con- nection with the upper nerve ring ; they have the form of. FIG. 184.—Auditory vesicle of Get-y- (Caruiai-hiii), seen from the surface (after O. and R. Hertwig-). JV and N', The aud
. Elementary text-book of zoology. Zoology. FIG. 183.—Sense organ on the nerve-ring and circular vessel of Octorchia (after O. and R. Hertwig). Rb, Sense organ ; O, O', two otoliths; Hh, audi- tory cilia ; Hz, auditory cells ; Nv, upper nerve-ring ; Kr/, cir- cular vessel. (Type of the audi- tory organ of the Vesiculalu.) The audi- tory organs of the Tra- chymedusce are placed above the velum, and are in con- nection with the upper nerve ring ; they have the form of. FIG. 184.—Auditory vesicle of Get-y- (Caruiai-hiii), seen from the surface (after O. and R. Hertwig-). JV and N', The auditory nerves ; Ot, otolith ; Hz, auditory cells ; Jilt, auditory cilia (type of the auditory organ of the Trachy- medusas). small projecting tentacles furnished with otoliths and auditory hairs. The tentacle may either project freely on the surface (Trachynema\ or, as in G&ryonia, it may be placed in a vesicle (fig. 184) which lies in the gelatinous substance of the disc and close to the edge of the latter. Separate sexes are almost invariably the rule, but it is rare to find that the colonies are dkecious, , that male and female medusoids are developed in different colonies (Tubularia). Gemma- tion has occasionally been observed among the Medusa (Sarsia prolifera) and division (Sfomobrachium mirabile). The larva? of Cunina, which are parasitic on the Geryonidw, may also there give rise to a cluster of Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. New York : Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectzoology, bookyear1884
