Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 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), se
Elementary text-book of zoology (1884) Elementary text-book of zoology elementarytextbo0101clau Year: 1884 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 buds.
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