The porifera and coelentera . ariations inbody form by pointing out that almost any shape which a spongecan assume may be further complicated by the growth of a the outset the numerous form variations of sponges can beclassified into two distinct series, which start from a fundamentalmorphological difference in the mode of growth. In the first place,the primitive vase-like sponge, whether stalked or not, may retainits single osculum and gastral cavity, but become modified in formby unequal growth of the body wall. In the second i)lace, thegrowth may be such as to lead to the format
The porifera and coelentera . ariations inbody form by pointing out that almost any shape which a spongecan assume may be further complicated by the growth of a the outset the numerous form variations of sponges can beclassified into two distinct series, which start from a fundamentalmorphological difference in the mode of growth. In the first place,the primitive vase-like sponge, whether stalked or not, may retainits single osculum and gastral cavity, but become modified in formby unequal growth of the body wall. In the second i)lace, thegrowth may be such as to lead to the formation of new oscula, eachthe vent of a separate gastral cavity. Anticipating here the theory SPONGES of sponge individuality which we intend to adopt (see below, p. 89),the first-mentioned series may be termed modifications of the spongeperson, and the second, modifications of the sponge colony. Althoughthe two often merge into one another, we may consider them apart,and commence with those cases where the sponge person remains. Fig. 2. Fio. 3.
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