. A manual of zoology. Zoology. 214 CCELEXTERATA dermal axis formiiiL; the statoliths and the eetodermal ,' the sense cells. In the .E,L,'inida' (,i and j) the elub-likc tentacles, seated on an auditory cushion, Tiroject Ireeh- into the water; in the 'rrachyneniickc (2) tliey are partially trans- formed into'\esieles, and in the Geryonida- they arc completely enclosed and are sunk in the jcllv of the bell. 'Ehe \elar ort;ans of the Leptomcdusa? are placed on the subuiiibrellar surface of the \ eluni. They may be cither simple pits, or the mouths of the pits may close. In these both se
. A manual of zoology. Zoology. 214 CCELEXTERATA dermal axis formiiiL; the statoliths and the eetodermal ,' the sense cells. In the .E,L,'inida' (,i and j) the elub-likc tentacles, seated on an auditory cushion, Tiroject Ireeh- into the water; in the 'rrachyneniickc (2) tliey are partially trans- formed into'\esieles, and in the Geryonida- they arc completely enclosed and are sunk in the jcllv of the bell. 'Ehe \elar ort;ans of the Leptomcdusa? are placed on the subuiiibrellar surface of the \ eluni. They may be cither simple pits, or the mouths of the pits may close. In these both sense cells and stato- liths are ectodermal. I'ves and statocysts occur in dilTerent forms, a fact which formerly led to a di\ ision of mcdus;t into ocellate and vesiculate groui)S. 