The porifera and coelentera . Fig. setubalense, Kent. (After Wyville Tlionipson.) J. to be regarded as massive forms in which the more or less globularbody is not fixed, but lies loosely in the mud at the bottom of thesea, and which have developed peculiarities of structure correlated^vith their mode of life. Thus Trihradiion (Fig. 25) has developedan oscular tube of great length, while in Disi/ringa (Fig. 26) notonly is the exhalant ajjcrture prolonged in like manner into anelongated tube, but also an inhalant tube is developed, terminatingin a single aperture by which is taken in
The porifera and coelentera . Fig. setubalense, Kent. (After Wyville Tlionipson.) J. to be regarded as massive forms in which the more or less globularbody is not fixed, but lies loosely in the mud at the bottom of thesea, and which have developed peculiarities of structure correlated^vith their mode of life. Thus Trihradiion (Fig. 25) has developedan oscular tube of great length, while in Disi/ringa (Fig. 26) notonly is the exhalant ajjcrture prolonged in like manner into anelongated tube, but also an inhalant tube is developed, terminatingin a single aperture by which is taken in all the water whichenters the canal system. The cavity of the inhalant tube forms asort of atrial chamber, as it were, in which all the pores are collected,and no pores are found on the surface of the body. Bisi/miga is 14 SPONGES. Jlyiilnnenut Japan, withsymbiotic polyps(i\i!ylho<i) growing(m tlie upixT por-tion or tlif root-tuft. (After Agas-siz.) *. Fio. photnix, (After Agassiz.) J. SPOxWGES
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Keywords: ., bookcentury1900, bookdecade1900, booksubje, booksubjectctenophora
